/* Subroutines used for code generation on the Synopsys DesignWare ARC cpu. Copyright (C) 1994-2020 Free Software Foundation, Inc. Sources derived from work done by Sankhya Technologies (www.sankhya.com) on behalf of Synopsys Inc. Position Independent Code support added,Code cleaned up, Comments and Support For ARC700 instructions added by Saurabh Verma (saurabh.verma@codito.com) Ramana Radhakrishnan(ramana.radhakrishnan@codito.com) Fixing ABI inconsistencies, optimizations for ARC600 / ARC700 pipelines, profiling support added by Joern Rennecke This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see . */ #define IN_TARGET_CODE 1 #include "config.h" #include "system.h" #include "coretypes.h" #include "memmodel.h" #include "backend.h" #include "target.h" #include "rtl.h" #include "tree.h" #include "cfghooks.h" #include "df.h" #include "tm_p.h" #include "stringpool.h" #include "attribs.h" #include "optabs.h" #include "regs.h" #include "emit-rtl.h" #include "recog.h" #include "diagnostic.h" #include "fold-const.h" #include "varasm.h" #include "stor-layout.h" #include "calls.h" #include "output.h" #include "insn-attr.h" #include "flags.h" #include "explow.h" #include "expr.h" #include "langhooks.h" #include "tm-constrs.h" #include "reload.h" /* For operands_match_p */ #include "cfgrtl.h" #include "tree-pass.h" #include "context.h" #include "builtins.h" #include "rtl-iter.h" #include "alias.h" #include "opts.h" #include "hw-doloop.h" /* Which cpu we're compiling for (ARC600, ARC601, ARC700). */ static char arc_cpu_name[10] = ""; static const char *arc_cpu_string = arc_cpu_name; typedef struct GTY (()) _arc_jli_section { const char *name; struct _arc_jli_section *next; } arc_jli_section; static arc_jli_section *arc_jli_sections = NULL; /* Track which regs are set fixed/call saved/call used from commnad line. */ HARD_REG_SET overrideregs; /* Maximum size of a loop. */ #define ARC_MAX_LOOP_LENGTH 4095 /* Check if an rtx fits in the store instruction format. Loads can handle any constant. */ #define RTX_OK_FOR_OFFSET_P(MODE, X) \ (GET_CODE (X) == CONST_INT \ && SMALL_INT_RANGE (INTVAL (X), (GET_MODE_SIZE (MODE) - 1) & (~0x03), \ (INTVAL (X) & (GET_MODE_SIZE (MODE) - 1) & 3 \ ? 0 \ : -(-GET_MODE_SIZE (MODE) | (~0x03)) >> 1))) /* Array of valid operand punctuation characters. */ char arc_punct_chars[256]; /* State used by arc_ccfsm_advance to implement conditional execution. */ struct GTY (()) arc_ccfsm { int state; int cc; rtx cond; rtx_insn *target_insn; int target_label; }; /* Status of the IRQ_CTRL_AUX register. */ typedef struct irq_ctrl_saved_t { /* Last register number used by IRQ_CTRL_SAVED aux_reg. */ short irq_save_last_reg; /* True if BLINK is automatically saved. */ bool irq_save_blink; /* True if LPCOUNT is automatically saved. */ bool irq_save_lpcount; } irq_ctrl_saved_t; static irq_ctrl_saved_t irq_ctrl_saved; #define ARC_AUTOBLINK_IRQ_P(FNTYPE) \ ((ARC_INTERRUPT_P (FNTYPE) \ && irq_ctrl_saved.irq_save_blink) \ || (ARC_FAST_INTERRUPT_P (FNTYPE) \ && rgf_banked_register_count > 8)) #define ARC_AUTOFP_IRQ_P(FNTYPE) \ ((ARC_INTERRUPT_P (FNTYPE) \ && (irq_ctrl_saved.irq_save_last_reg > 26)) \ || (ARC_FAST_INTERRUPT_P (FNTYPE) \ && rgf_banked_register_count > 8)) #define ARC_AUTO_IRQ_P(FNTYPE) \ (ARC_INTERRUPT_P (FNTYPE) && !ARC_FAST_INTERRUPT_P (FNTYPE) \ && (irq_ctrl_saved.irq_save_blink \ || (irq_ctrl_saved.irq_save_last_reg >= 0))) /* Number of registers in second bank for FIRQ support. */ static int rgf_banked_register_count; #define arc_ccfsm_current cfun->machine->ccfsm_current #define ARC_CCFSM_BRANCH_DELETED_P(STATE) \ ((STATE)->state == 1 || (STATE)->state == 2) /* Indicate we're conditionalizing insns now. */ #define ARC_CCFSM_RECORD_BRANCH_DELETED(STATE) \ ((STATE)->state += 2) #define ARC_CCFSM_COND_EXEC_P(STATE) \ ((STATE)->state == 3 || (STATE)->state == 4 || (STATE)->state == 5 \ || current_insn_predicate) /* Check if INSN has a 16 bit opcode considering struct arc_ccfsm *STATE. */ #define CCFSM_ISCOMPACT(INSN,STATE) \ (ARC_CCFSM_COND_EXEC_P (STATE) \ ? (get_attr_iscompact (INSN) == ISCOMPACT_TRUE \ || get_attr_iscompact (INSN) == ISCOMPACT_TRUE_LIMM) \ : get_attr_iscompact (INSN) != ISCOMPACT_FALSE) /* Likewise, but also consider that INSN might be in a delay slot of JUMP. */ #define CCFSM_DBR_ISCOMPACT(INSN,JUMP,STATE) \ ((ARC_CCFSM_COND_EXEC_P (STATE) \ || (JUMP_P (JUMP) \ && INSN_ANNULLED_BRANCH_P (JUMP) \ && (TARGET_AT_DBR_CONDEXEC || INSN_FROM_TARGET_P (INSN)))) \ ? (get_attr_iscompact (INSN) == ISCOMPACT_TRUE \ || get_attr_iscompact (INSN) == ISCOMPACT_TRUE_LIMM) \ : get_attr_iscompact (INSN) != ISCOMPACT_FALSE) /* Start enter/leave register range. */ #define ENTER_LEAVE_START_REG 13 /* End enter/leave register range. */ #define ENTER_LEAVE_END_REG 26 /* The maximum number of insns skipped which will be conditionalised if possible. */ /* When optimizing for speed: Let p be the probability that the potentially skipped insns need to be executed, pn the cost of a correctly predicted non-taken branch, mt the cost of a mis/non-predicted taken branch, mn mispredicted non-taken, pt correctly predicted taken ; costs expressed in numbers of instructions like the ones considered skipping. Unfortunately we don't have a measure of predictability - this is linked to probability only in that in the no-eviction-scenario there is a lower bound 1 - 2 * min (p, 1-p), and a somewhat larger value that can be assumed *if* the distribution is perfectly random. A predictability of 1 is perfectly plausible not matter what p is, because the decision could be dependent on an invocation parameter of the program. For large p, we want MAX_INSNS_SKIPPED == pn/(1-p) + mt - pn For small p, we want MAX_INSNS_SKIPPED == pt When optimizing for size: We want to skip insn unless we could use 16 opcodes for the non-conditionalized insn to balance the branch length or more. Performance can be tie-breaker. */ /* If the potentially-skipped insns are likely to be executed, we'll generally save one non-taken branch o this to be no less than the 1/p */ #define MAX_INSNS_SKIPPED 3 /* ZOL control registers. */ #define AUX_LP_START 0x02 #define AUX_LP_END 0x03 /* FPX AUX registers. */ #define AUX_DPFP_START 0x301 /* ARC600 MULHI register. */ #define AUX_MULHI 0x12 /* A nop is needed between a 4 byte insn that sets the condition codes and a branch that uses them (the same isn't true for an 8 byte insn that sets the condition codes). Set by arc_ccfsm_advance. Used by arc_print_operand. */ static int get_arc_condition_code (rtx); static tree arc_handle_interrupt_attribute (tree *, tree, tree, int, bool *); static tree arc_handle_fndecl_attribute (tree *, tree, tree, int, bool *); static tree arc_handle_jli_attribute (tree *, tree, tree, int, bool *); static tree arc_handle_secure_attribute (tree *, tree, tree, int, bool *); static tree arc_handle_uncached_attribute (tree *, tree, tree, int, bool *); static tree arc_handle_aux_attribute (tree *, tree, tree, int, bool *); /* Initialized arc_attribute_table to NULL since arc doesnot have any machine specific supported attributes. */ const struct attribute_spec arc_attribute_table[] = { /* { name, min_len, max_len, decl_req, type_req, fn_type_req, affects_type_identity, handler, exclude } */ { "interrupt", 1, 1, true, false, false, true, arc_handle_interrupt_attribute, NULL }, /* Function calls made to this symbol must be done indirectly, because it may lie outside of the 21/25 bit addressing range of a normal function call. */ { "long_call", 0, 0, false, true, true, false, NULL, NULL }, /* Whereas these functions are always known to reside within the 25 bit addressing range of unconditionalized bl. */ { "medium_call", 0, 0, false, true, true, false, NULL, NULL }, /* And these functions are always known to reside within the 21 bit addressing range of blcc. */ { "short_call", 0, 0, false, true, true, false, NULL, NULL }, /* Function which are not having the prologue and epilogue generated by the compiler. */ { "naked", 0, 0, true, false, false, false, arc_handle_fndecl_attribute, NULL }, /* Functions calls made using jli instruction. The pointer in JLI table is found latter. */ { "jli_always", 0, 0, false, true, true, false, NULL, NULL }, /* Functions calls made using jli instruction. The pointer in JLI table is given as input parameter. */ { "jli_fixed", 1, 1, false, true, true, false, arc_handle_jli_attribute, NULL }, /* Call a function using secure-mode. */ { "secure_call", 1, 1, false, true, true, false, arc_handle_secure_attribute, NULL }, /* Bypass caches using .di flag. */ { "uncached", 0, 0, false, true, false, false, arc_handle_uncached_attribute, NULL }, { "aux", 0, 1, true, false, false, false, arc_handle_aux_attribute, NULL }, { NULL, 0, 0, false, false, false, false, NULL, NULL } }; static int arc_comp_type_attributes (const_tree, const_tree); static void arc_file_start (void); static void arc_internal_label (FILE *, const char *, unsigned long); static void arc_output_mi_thunk (FILE *, tree, HOST_WIDE_INT, HOST_WIDE_INT, tree); static int arc_address_cost (rtx, machine_mode, addr_space_t, bool); static void arc_encode_section_info (tree decl, rtx rtl, int first); static void arc_init_builtins (void); static rtx arc_expand_builtin (tree, rtx, rtx, machine_mode, int); static int branch_dest (rtx); static void arc_output_pic_addr_const (FILE *, rtx, int); static bool arc_function_ok_for_sibcall (tree, tree); static rtx arc_function_value (const_tree, const_tree, bool); const char * output_shift (rtx *); static void arc_reorg (void); static bool arc_in_small_data_p (const_tree); static void arc_init_reg_tables (void); static bool arc_return_in_memory (const_tree, const_tree); static bool arc_vector_mode_supported_p (machine_mode); static bool arc_can_use_doloop_p (const widest_int &, const widest_int &, unsigned int, bool); static const char *arc_invalid_within_doloop (const rtx_insn *); static void output_short_suffix (FILE *file); static bool arc_frame_pointer_required (void); static bool arc_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT, unsigned int, enum by_pieces_operation op, bool); /* Globally visible information about currently selected cpu. */ const arc_cpu_t *arc_selected_cpu; /* Traditionally, we push saved registers first in the prologue, then we allocate the rest of the frame - and reverse in the epilogue. This has still its merits for ease of debugging, or saving code size or even execution time if the stack frame is so large that some accesses can't be encoded anymore with offsets in the instruction code when using a different scheme. Also, it would be a good starting point if we got instructions to help with register save/restore. However, often stack frames are small, and the pushing / popping has some costs: - the stack modification prevents a lot of scheduling. - frame allocation / deallocation may need extra instructions. - we need to place a memory barrier after frame allocation to avoid the delay slot scheduler to reschedule a frame related info and messing up with dwarf unwinding. The barrier before deallocation is for flushing all pending sp operations. Thus, for small frames, we'd like to use a different scheme: - The frame is allocated in full with the first prologue instruction, and deallocated in full with the last epilogue instruction. Thus, the instructions in-between can be freely scheduled. - If the function has no outgoing arguments on the stack, we can allocate one register save slot at the top of the stack. This register can then be saved simultaneously with frame allocation, and restored with frame deallocation. This register can be picked depending on scheduling considerations, although same though should go into having some set of registers to be potentially lingering after a call, and others to be available immediately - i.e. in the absence of interprocedual optimization, we can use an ABI-like convention for register allocation to reduce stalls after function return. */ /* ARCompact stack frames look like: Before call After call high +-----------------------+ +-----------------------+ mem | reg parm save area | | reg parm save area | | only created for | | only created for | | variable arg fns | | variable arg fns | AP +-----------------------+ +-----------------------+ | return addr register | | return addr register | | (if required) | | (if required) | +-----------------------+ +-----------------------+ | | | | | reg save area | | reg save area | | | | | +-----------------------+ +-----------------------+ | frame pointer | | frame pointer | | (if required) | | (if required) | FP +-----------------------+ +-----------------------+ | | | | | local/temp variables | | local/temp variables | | | | | +-----------------------+ +-----------------------+ | | | | | arguments on stack | | arguments on stack | | | | | SP +-----------------------+ +-----------------------+ | reg parm save area | | only created for | | variable arg fns | AP +-----------------------+ | return addr register | | (if required) | +-----------------------+ | | | reg save area | | | +-----------------------+ | frame pointer | | (if required) | FP +-----------------------+ | | | local/temp variables | | | +-----------------------+ | | | arguments on stack | low | | mem SP +-----------------------+ Notes: 1) The "reg parm save area" does not exist for non variable argument fns. The "reg parm save area" can be eliminated completely if we created our own va-arc.h, but that has tradeoffs as well (so it's not done). */ /* Structure to be filled in by arc_compute_frame_size with register save masks, and offsets for the current function. */ struct GTY (()) arc_frame_info { unsigned int total_size; /* # bytes that the entire frame takes up. */ unsigned int extra_size; /* # bytes of extra stuff. */ unsigned int pretend_size; /* # bytes we push and pretend caller did. */ unsigned int args_size; /* # bytes that outgoing arguments take up. */ unsigned int reg_size; /* # bytes needed to store regs. */ unsigned int var_size; /* # bytes that variables take up. */ uint64_t gmask; /* Mask of saved gp registers. */ bool initialized; /* FALSE if frame size already calculated. */ short millicode_start_reg; short millicode_end_reg; bool save_return_addr; }; /* GMASK bit length -1. */ #define GMASK_LEN 63 /* Defining data structures for per-function information. */ typedef struct GTY (()) machine_function { unsigned int fn_type; struct arc_frame_info frame_info; /* To keep track of unalignment caused by short insns. */ int unalign; struct arc_ccfsm ccfsm_current; /* Map from uid to ccfsm state during branch shortening. */ rtx ccfsm_current_insn; char arc_reorg_started; char prescan_initialized; } machine_function; /* Given a symbol RTX (const (symb <+ const_int>), returns its alignment. */ static int get_symbol_alignment (rtx x) { tree decl = NULL_TREE; int align = 0; switch (GET_CODE (x)) { case SYMBOL_REF: decl = SYMBOL_REF_DECL (x); break; case CONST: return get_symbol_alignment (XEXP (x, 0)); case PLUS: gcc_assert (CONST_INT_P (XEXP (x, 1))); return get_symbol_alignment (XEXP (x, 0)); default: return 0; } if (decl) align = DECL_ALIGN (decl); align = align / BITS_PER_UNIT; return align; } /* Return true if x is ok to be used as a small data address. */ static bool legitimate_small_data_address_p (rtx x, machine_mode mode) { switch (GET_CODE (x)) { case CONST: return legitimate_small_data_address_p (XEXP (x, 0), mode); case SYMBOL_REF: return SYMBOL_REF_SMALL_P (x); case PLUS: { bool p0 = (GET_CODE (XEXP (x, 0)) == SYMBOL_REF) && SYMBOL_REF_SMALL_P (XEXP (x, 0)); /* If no constant then we cannot do small data. */ if (!CONST_INT_P (XEXP (x, 1))) return false; /* Small data relocs works with scalled addresses, check if the immediate fits the requirements. */ switch (GET_MODE_SIZE (mode)) { case 1: return p0; case 2: return p0 && ((INTVAL (XEXP (x, 1)) & 0x1) == 0); case 4: case 8: return p0 && ((INTVAL (XEXP (x, 1)) & 0x3) == 0); default: return false; } } default: return false; } } /* TRUE if op is an scaled address. */ static bool legitimate_scaled_address_p (machine_mode mode, rtx op, bool strict) { if (GET_CODE (op) != PLUS) return false; if (GET_CODE (XEXP (op, 0)) != MULT) return false; /* Check multiplication operands. */ if (!RTX_OK_FOR_INDEX_P (XEXP (XEXP (op, 0), 0), strict)) return false; if (!CONST_INT_P (XEXP (XEXP (op, 0), 1))) return false; switch (GET_MODE_SIZE (mode)) { case 2: if (INTVAL (XEXP (XEXP (op, 0), 1)) != 2) return false; break; case 8: if (!TARGET_LL64) return false; /* Fall through. */ case 4: if (INTVAL (XEXP (XEXP (op, 0), 1)) != 4) return false; /* Fall through. */ default: return false; } /* Check the base. */ if (RTX_OK_FOR_BASE_P (XEXP (op, 1), (strict))) return true; if (flag_pic) { if (CONST_INT_P (XEXP (op, 1))) return true; return false; } /* Scalled addresses for sdata is done other places. */ if (legitimate_small_data_address_p (op, mode)) return false; if (CONSTANT_P (XEXP (op, 1))) return true; return false; } /* Check for constructions like REG + OFFS, where OFFS can be a register, an immediate or an long immediate. */ static bool legitimate_offset_address_p (machine_mode mode, rtx x, bool index, bool strict) { if (GET_CODE (x) != PLUS) return false; if (!RTX_OK_FOR_BASE_P (XEXP (x, 0), (strict))) return false; /* Check for: [Rx + small offset] or [Rx + Ry]. */ if (((index && RTX_OK_FOR_INDEX_P (XEXP (x, 1), (strict)) && GET_MODE_SIZE ((mode)) <= 4) || RTX_OK_FOR_OFFSET_P (mode, XEXP (x, 1)))) return true; /* Check for [Rx + symbol]. */ if (!flag_pic && (GET_CODE (XEXP (x, 1)) == SYMBOL_REF) /* Avoid this type of address for double or larger modes. */ && (GET_MODE_SIZE (mode) <= 4) /* Avoid small data which ends in something like GP + symb@sda. */ && (!SYMBOL_REF_SMALL_P (XEXP (x, 1)))) return true; return false; } /* Implements target hook vector_mode_supported_p. */ static bool arc_vector_mode_supported_p (machine_mode mode) { switch (mode) { case E_V2HImode: return TARGET_PLUS_DMPY; case E_V4HImode: case E_V2SImode: return TARGET_PLUS_QMACW; case E_V4SImode: case E_V8HImode: return TARGET_SIMD_SET; default: return false; } } /* Implements target hook TARGET_VECTORIZE_PREFERRED_SIMD_MODE. */ static machine_mode arc_preferred_simd_mode (scalar_mode mode) { switch (mode) { case E_HImode: return TARGET_PLUS_QMACW ? V4HImode : V2HImode; case E_SImode: return V2SImode; default: return word_mode; } } /* Implements target hook TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_MODES. */ static unsigned int arc_autovectorize_vector_modes (vector_modes *modes, bool) { if (TARGET_PLUS_QMACW) { modes->quick_push (V4HImode); modes->quick_push (V2HImode); } return 0; } /* Implements target hook TARGET_SCHED_ISSUE_RATE. */ static int arc_sched_issue_rate (void) { switch (arc_tune) { case TUNE_ARCHS4X: case TUNE_ARCHS4XD: return 3; default: break; } return 1; } /* TARGET_PRESERVE_RELOAD_P is still awaiting patch re-evaluation / review. */ static bool arc_preserve_reload_p (rtx in) ATTRIBUTE_UNUSED; static rtx arc_delegitimize_address (rtx); static bool arc_can_follow_jump (const rtx_insn *follower, const rtx_insn *followee); static rtx frame_insn (rtx); static void arc_function_arg_advance (cumulative_args_t, const function_arg_info &); static rtx arc_legitimize_address_0 (rtx, rtx, machine_mode mode); /* initialize the GCC target structure. */ #undef TARGET_COMP_TYPE_ATTRIBUTES #define TARGET_COMP_TYPE_ATTRIBUTES arc_comp_type_attributes #undef TARGET_ASM_FILE_START #define TARGET_ASM_FILE_START arc_file_start #undef TARGET_ATTRIBUTE_TABLE #define TARGET_ATTRIBUTE_TABLE arc_attribute_table #undef TARGET_ASM_INTERNAL_LABEL #define TARGET_ASM_INTERNAL_LABEL arc_internal_label #undef TARGET_RTX_COSTS #define TARGET_RTX_COSTS arc_rtx_costs #undef TARGET_ADDRESS_COST #define TARGET_ADDRESS_COST arc_address_cost #undef TARGET_ENCODE_SECTION_INFO #define TARGET_ENCODE_SECTION_INFO arc_encode_section_info #undef TARGET_CANNOT_FORCE_CONST_MEM #define TARGET_CANNOT_FORCE_CONST_MEM arc_cannot_force_const_mem #undef TARGET_INIT_BUILTINS #define TARGET_INIT_BUILTINS arc_init_builtins #undef TARGET_EXPAND_BUILTIN #define TARGET_EXPAND_BUILTIN arc_expand_builtin #undef TARGET_BUILTIN_DECL #define TARGET_BUILTIN_DECL arc_builtin_decl #undef TARGET_ASM_OUTPUT_MI_THUNK #define TARGET_ASM_OUTPUT_MI_THUNK arc_output_mi_thunk #undef TARGET_ASM_CAN_OUTPUT_MI_THUNK #define TARGET_ASM_CAN_OUTPUT_MI_THUNK hook_bool_const_tree_hwi_hwi_const_tree_true #undef TARGET_FUNCTION_OK_FOR_SIBCALL #define TARGET_FUNCTION_OK_FOR_SIBCALL arc_function_ok_for_sibcall #undef TARGET_MACHINE_DEPENDENT_REORG #define TARGET_MACHINE_DEPENDENT_REORG arc_reorg #undef TARGET_IN_SMALL_DATA_P #define TARGET_IN_SMALL_DATA_P arc_in_small_data_p #undef TARGET_PROMOTE_FUNCTION_MODE #define TARGET_PROMOTE_FUNCTION_MODE \ default_promote_function_mode_always_promote #undef TARGET_PROMOTE_PROTOTYPES #define TARGET_PROMOTE_PROTOTYPES hook_bool_const_tree_true #undef TARGET_RETURN_IN_MEMORY #define TARGET_RETURN_IN_MEMORY arc_return_in_memory #undef TARGET_PASS_BY_REFERENCE #define TARGET_PASS_BY_REFERENCE arc_pass_by_reference #undef TARGET_SETUP_INCOMING_VARARGS #define TARGET_SETUP_INCOMING_VARARGS arc_setup_incoming_varargs #undef TARGET_ARG_PARTIAL_BYTES #define TARGET_ARG_PARTIAL_BYTES arc_arg_partial_bytes #undef TARGET_MUST_PASS_IN_STACK #define TARGET_MUST_PASS_IN_STACK must_pass_in_stack_var_size #undef TARGET_FUNCTION_VALUE #define TARGET_FUNCTION_VALUE arc_function_value #undef TARGET_SCHED_ADJUST_PRIORITY #define TARGET_SCHED_ADJUST_PRIORITY arc_sched_adjust_priority #undef TARGET_SCHED_ISSUE_RATE #define TARGET_SCHED_ISSUE_RATE arc_sched_issue_rate #undef TARGET_VECTOR_MODE_SUPPORTED_P #define TARGET_VECTOR_MODE_SUPPORTED_P arc_vector_mode_supported_p #undef TARGET_VECTORIZE_PREFERRED_SIMD_MODE #define TARGET_VECTORIZE_PREFERRED_SIMD_MODE arc_preferred_simd_mode #undef TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_MODES #define TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_MODES arc_autovectorize_vector_modes #undef TARGET_CAN_USE_DOLOOP_P #define TARGET_CAN_USE_DOLOOP_P arc_can_use_doloop_p #undef TARGET_INVALID_WITHIN_DOLOOP #define TARGET_INVALID_WITHIN_DOLOOP arc_invalid_within_doloop #undef TARGET_PRESERVE_RELOAD_P #define TARGET_PRESERVE_RELOAD_P arc_preserve_reload_p #undef TARGET_CAN_FOLLOW_JUMP #define TARGET_CAN_FOLLOW_JUMP arc_can_follow_jump #undef TARGET_DELEGITIMIZE_ADDRESS #define TARGET_DELEGITIMIZE_ADDRESS arc_delegitimize_address #undef TARGET_USE_BY_PIECES_INFRASTRUCTURE_P #define TARGET_USE_BY_PIECES_INFRASTRUCTURE_P \ arc_use_by_pieces_infrastructure_p /* Usually, we will be able to scale anchor offsets. When this fails, we want LEGITIMIZE_ADDRESS to kick in. */ #undef TARGET_MIN_ANCHOR_OFFSET #define TARGET_MIN_ANCHOR_OFFSET (-1024) #undef TARGET_MAX_ANCHOR_OFFSET #define TARGET_MAX_ANCHOR_OFFSET (1020) #undef TARGET_SECONDARY_RELOAD #define TARGET_SECONDARY_RELOAD arc_secondary_reload #define TARGET_OPTION_OVERRIDE arc_override_options #define TARGET_CONDITIONAL_REGISTER_USAGE arc_conditional_register_usage #define TARGET_TRAMPOLINE_INIT arc_initialize_trampoline #define TARGET_CAN_ELIMINATE arc_can_eliminate #define TARGET_FRAME_POINTER_REQUIRED arc_frame_pointer_required #define TARGET_FUNCTION_ARG arc_function_arg #define TARGET_FUNCTION_ARG_ADVANCE arc_function_arg_advance #define TARGET_LEGITIMATE_CONSTANT_P arc_legitimate_constant_p #define TARGET_LEGITIMATE_ADDRESS_P arc_legitimate_address_p #define TARGET_MODE_DEPENDENT_ADDRESS_P arc_mode_dependent_address_p #define TARGET_LEGITIMIZE_ADDRESS arc_legitimize_address #undef TARGET_NO_SPECULATION_IN_DELAY_SLOTS_P #define TARGET_NO_SPECULATION_IN_DELAY_SLOTS_P \ arc_no_speculation_in_delay_slots_p #undef TARGET_LRA_P #define TARGET_LRA_P arc_lra_p #define TARGET_REGISTER_PRIORITY arc_register_priority /* Stores with scaled offsets have different displacement ranges. */ #define TARGET_DIFFERENT_ADDR_DISPLACEMENT_P hook_bool_void_true #define TARGET_SPILL_CLASS arc_spill_class #undef TARGET_ALLOCATE_STACK_SLOTS_FOR_ARGS #define TARGET_ALLOCATE_STACK_SLOTS_FOR_ARGS arc_allocate_stack_slots_for_args #undef TARGET_WARN_FUNC_RETURN #define TARGET_WARN_FUNC_RETURN arc_warn_func_return #include "target-def.h" #undef TARGET_ASM_ALIGNED_HI_OP #define TARGET_ASM_ALIGNED_HI_OP "\t.hword\t" #undef TARGET_ASM_ALIGNED_SI_OP #define TARGET_ASM_ALIGNED_SI_OP "\t.word\t" #ifdef HAVE_AS_TLS #undef TARGET_HAVE_TLS #define TARGET_HAVE_TLS HAVE_AS_TLS #endif #undef TARGET_DWARF_REGISTER_SPAN #define TARGET_DWARF_REGISTER_SPAN arc_dwarf_register_span #undef TARGET_HARD_REGNO_NREGS #define TARGET_HARD_REGNO_NREGS arc_hard_regno_nregs #undef TARGET_HARD_REGNO_MODE_OK #define TARGET_HARD_REGNO_MODE_OK arc_hard_regno_mode_ok #undef TARGET_MODES_TIEABLE_P #define TARGET_MODES_TIEABLE_P arc_modes_tieable_p /* Try to keep the (mov:DF _, reg) as early as possible so that the dh-lr insns appear together and can use the peephole2 pattern. */ static int arc_sched_adjust_priority (rtx_insn *insn, int priority) { rtx set = single_set (insn); if (set && GET_MODE (SET_SRC(set)) == DFmode && GET_CODE (SET_SRC(set)) == REG) { /* Incrementing priority by 20 (empirically derived). */ return priority + 20; } return priority; } /* For ARC base register + offset addressing, the validity of the address is mode-dependent for most of the offset range, as the offset can be scaled by the access size. We don't expose these as mode-dependent addresses in the mode_dependent_address_p target hook, because that would disable lots of optimizations, and most uses of these addresses are for 32 or 64 bit accesses anyways, which are fine. However, that leaves some addresses for 8 / 16 bit values not properly reloaded by the generic code, which is why we have to schedule secondary reloads for these. */ static reg_class_t arc_secondary_reload (bool in_p, rtx x, reg_class_t cl, machine_mode mode, secondary_reload_info *sri) { enum rtx_code code = GET_CODE (x); if (cl == DOUBLE_REGS) return GENERAL_REGS; /* If we have a subreg (reg), where reg is a pseudo (that will end in a memory location), then we may need a scratch register to handle the fp/sp+largeoffset address. */ if (code == SUBREG) { rtx addr = NULL_RTX; x = SUBREG_REG (x); if (REG_P (x)) { int regno = REGNO (x); if (regno >= FIRST_PSEUDO_REGISTER) regno = reg_renumber[regno]; if (regno != -1) return NO_REGS; /* It is a pseudo that ends in a stack location. This procedure only works with the old reload step. */ if (reg_equiv_mem (REGNO (x)) && !lra_in_progress) { /* Get the equivalent address and check the range of the offset. */ rtx mem = reg_equiv_mem (REGNO (x)); addr = find_replacement (&XEXP (mem, 0)); } } else { gcc_assert (MEM_P (x)); addr = XEXP (x, 0); addr = simplify_rtx (addr); } if (addr && GET_CODE (addr) == PLUS && CONST_INT_P (XEXP (addr, 1)) && (!RTX_OK_FOR_OFFSET_P (mode, XEXP (addr, 1)))) { switch (mode) { case E_QImode: sri->icode = in_p ? CODE_FOR_reload_qi_load : CODE_FOR_reload_qi_store; break; case E_HImode: sri->icode = in_p ? CODE_FOR_reload_hi_load : CODE_FOR_reload_hi_store; break; default: break; } } } return NO_REGS; } /* Convert reloads using offsets that are too large to use indirect addressing. */ void arc_secondary_reload_conv (rtx reg, rtx mem, rtx scratch, bool store_p) { rtx addr; gcc_assert (GET_CODE (mem) == MEM); addr = XEXP (mem, 0); /* Large offset: use a move. FIXME: ld ops accepts limms as offsets. Hence, the following move insn is not required. */ emit_move_insn (scratch, addr); mem = replace_equiv_address_nv (mem, scratch); /* Now create the move. */ if (store_p) emit_insn (gen_rtx_SET (mem, reg)); else emit_insn (gen_rtx_SET (reg, mem)); return; } static unsigned arc_ifcvt (void); namespace { const pass_data pass_data_arc_ifcvt = { RTL_PASS, "arc_ifcvt", /* name */ OPTGROUP_NONE, /* optinfo_flags */ TV_IFCVT2, /* tv_id */ 0, /* properties_required */ 0, /* properties_provided */ 0, /* properties_destroyed */ 0, /* todo_flags_start */ TODO_df_finish /* todo_flags_finish */ }; class pass_arc_ifcvt : public rtl_opt_pass { public: pass_arc_ifcvt (gcc::context *ctxt) : rtl_opt_pass (pass_data_arc_ifcvt, ctxt) {} /* opt_pass methods: */ opt_pass * clone () { return new pass_arc_ifcvt (m_ctxt); } virtual unsigned int execute (function *) { return arc_ifcvt (); } virtual bool gate (function *) { return (optimize > 1 && !TARGET_NO_COND_EXEC); } }; } // anon namespace rtl_opt_pass * make_pass_arc_ifcvt (gcc::context *ctxt) { return new pass_arc_ifcvt (ctxt); } static unsigned arc_predicate_delay_insns (void); namespace { const pass_data pass_data_arc_predicate_delay_insns = { RTL_PASS, "arc_predicate_delay_insns", /* name */ OPTGROUP_NONE, /* optinfo_flags */ TV_IFCVT2, /* tv_id */ 0, /* properties_required */ 0, /* properties_provided */ 0, /* properties_destroyed */ 0, /* todo_flags_start */ TODO_df_finish /* todo_flags_finish */ }; class pass_arc_predicate_delay_insns : public rtl_opt_pass { public: pass_arc_predicate_delay_insns(gcc::context *ctxt) : rtl_opt_pass(pass_data_arc_predicate_delay_insns, ctxt) {} /* opt_pass methods: */ virtual unsigned int execute (function *) { return arc_predicate_delay_insns (); } virtual bool gate (function *) { return flag_delayed_branch; } }; } // anon namespace rtl_opt_pass * make_pass_arc_predicate_delay_insns (gcc::context *ctxt) { return new pass_arc_predicate_delay_insns (ctxt); } /* Called by OVERRIDE_OPTIONS to initialize various things. */ static void arc_init (void) { if (TARGET_V2) { /* I have the multiplier, then use it*/ if (TARGET_MPYW || TARGET_MULTI) arc_multcost = COSTS_N_INSNS (1); } /* Note: arc_multcost is only used in rtx_cost if speed is true. */ if (arc_multcost < 0) switch (arc_tune) { case ARC_TUNE_ARC700_4_2_STD: /* latency 7; max throughput (1 multiply + 4 other insns) / 5 cycles. */ arc_multcost = COSTS_N_INSNS (4); if (TARGET_NOMPY_SET) arc_multcost = COSTS_N_INSNS (30); break; case ARC_TUNE_ARC700_4_2_XMAC: /* latency 5; max throughput (1 multiply + 2 other insns) / 3 cycles. */ arc_multcost = COSTS_N_INSNS (3); if (TARGET_NOMPY_SET) arc_multcost = COSTS_N_INSNS (30); break; case ARC_TUNE_ARC600: if (TARGET_MUL64_SET) { arc_multcost = COSTS_N_INSNS (4); break; } /* Fall through. */ default: arc_multcost = COSTS_N_INSNS (30); break; } /* MPY instructions valid only for ARC700 or ARCv2. */ if (TARGET_NOMPY_SET && TARGET_ARC600_FAMILY) error ("%<-mno-mpy%> supported only for ARC700 or ARCv2"); if (!TARGET_DPFP && TARGET_DPFP_DISABLE_LRSR) error ("%<-mno-dpfp-lrsr%> supported only with %<-mdpfp%>"); /* FPX-1. No fast and compact together. */ if ((TARGET_DPFP_FAST_SET && TARGET_DPFP_COMPACT_SET) || (TARGET_SPFP_FAST_SET && TARGET_SPFP_COMPACT_SET)) error ("FPX fast and compact options cannot be specified together"); /* FPX-2. No fast-spfp for arc600 or arc601. */ if (TARGET_SPFP_FAST_SET && TARGET_ARC600_FAMILY) error ("%<-mspfp_fast%> not available on ARC600 or ARC601"); /* FPX-4. No FPX extensions mixed with FPU extensions. */ if ((TARGET_DPFP_FAST_SET || TARGET_DPFP_COMPACT_SET || TARGET_SPFP) && TARGET_HARD_FLOAT) error ("no FPX/FPU mixing allowed"); /* Warn for unimplemented PIC in pre-ARC700 cores, and disable flag_pic. */ if (flag_pic && TARGET_ARC600_FAMILY) { warning (0, "PIC is not supported for %qs", arc_cpu_string); flag_pic = 0; } arc_init_reg_tables (); /* Initialize array for PRINT_OPERAND_PUNCT_VALID_P. */ memset (arc_punct_chars, 0, sizeof (arc_punct_chars)); arc_punct_chars['#'] = 1; arc_punct_chars['*'] = 1; arc_punct_chars['?'] = 1; arc_punct_chars['!'] = 1; arc_punct_chars['^'] = 1; arc_punct_chars['&'] = 1; arc_punct_chars['+'] = 1; arc_punct_chars['_'] = 1; } /* Parse -mirq-ctrl-saved=RegisterRange, blink, lp_copunt. The register range is specified as two registers separated by a dash. It always starts with r0, and its upper limit is fp register. blink and lp_count registers are optional. */ static void irq_range (const char *cstr) { int i, first, last, blink, lpcount, xreg; char *str, *dash, *comma; i = strlen (cstr); str = (char *) alloca (i + 1); memcpy (str, cstr, i + 1); blink = -1; lpcount = -1; dash = strchr (str, '-'); if (!dash) { warning (OPT_mirq_ctrl_saved_, "missing dash"); return; } *dash = '\0'; comma = strchr (dash + 1, ','); if (comma) *comma = '\0'; first = decode_reg_name (str); if (first != 0) { warning (OPT_mirq_ctrl_saved_, "first register must be R0"); return; } /* At this moment we do not have the register names initialized accordingly. */ if (!strcmp (dash + 1, "ilink")) last = 29; else last = decode_reg_name (dash + 1); if (last < 0) { warning (OPT_mirq_ctrl_saved_, "unknown register name: %s", dash + 1); return; } if (!(last & 0x01)) { warning (OPT_mirq_ctrl_saved_, "last register name %s must be an odd register", dash + 1); return; } *dash = '-'; if (first > last) { warning (OPT_mirq_ctrl_saved_, "%s-%s is an empty range", str, dash + 1); return; } while (comma) { *comma = ','; str = comma + 1; comma = strchr (str, ','); if (comma) *comma = '\0'; xreg = decode_reg_name (str); switch (xreg) { case 31: blink = 31; break; case 60: lpcount = 60; break; default: warning (OPT_mirq_ctrl_saved_, "unknown register name: %s", str); return; } } irq_ctrl_saved.irq_save_last_reg = last; irq_ctrl_saved.irq_save_blink = (blink == 31) || (last == 31); irq_ctrl_saved.irq_save_lpcount = (lpcount == 60); } /* Parse -mrgf-banked-regs=NUM option string. Valid values for NUM are 4, 8, 16, or 32. */ static void parse_mrgf_banked_regs_option (const char *arg) { long int val; char *end_ptr; errno = 0; val = strtol (arg, &end_ptr, 10); if (errno != 0 || *arg == '\0' || *end_ptr != '\0' || (val != 0 && val != 4 && val != 8 && val != 16 && val != 32)) { error ("invalid number in %<-mrgf-banked-regs=%s%> " "valid values are 0, 4, 8, 16, or 32", arg); return; } rgf_banked_register_count = (int) val; } /* Check ARC options, generate derived target attributes. */ static void arc_override_options (void) { unsigned int i; cl_deferred_option *opt; vec *vopt = (vec *) arc_deferred_options; if (arc_cpu == PROCESSOR_NONE) arc_cpu = TARGET_CPU_DEFAULT; /* Set the default cpu options. */ arc_selected_cpu = &arc_cpu_types[(int) arc_cpu]; /* Set the architectures. */ switch (arc_selected_cpu->arch_info->arch_id) { case BASE_ARCH_em: arc_cpu_string = "EM"; break; case BASE_ARCH_hs: arc_cpu_string = "HS"; break; case BASE_ARCH_700: if (arc_selected_cpu->processor == PROCESSOR_nps400) arc_cpu_string = "NPS400"; else arc_cpu_string = "ARC700"; break; case BASE_ARCH_6xx: arc_cpu_string = "ARC600"; break; default: gcc_unreachable (); } irq_ctrl_saved.irq_save_last_reg = -1; irq_ctrl_saved.irq_save_blink = false; irq_ctrl_saved.irq_save_lpcount = false; rgf_banked_register_count = 0; /* Handle the deferred options. */ if (vopt) FOR_EACH_VEC_ELT (*vopt, i, opt) { switch (opt->opt_index) { case OPT_mirq_ctrl_saved_: if (TARGET_V2) irq_range (opt->arg); else warning (OPT_mirq_ctrl_saved_, "option %<-mirq-ctrl-saved%> valid only " "for ARC v2 processors"); break; case OPT_mrgf_banked_regs_: if (TARGET_V2) parse_mrgf_banked_regs_option (opt->arg); else warning (OPT_mrgf_banked_regs_, "option %<-mrgf-banked-regs%> valid only for " "ARC v2 processors"); break; default: gcc_unreachable(); } } CLEAR_HARD_REG_SET (overrideregs); if (common_deferred_options) { vec v = *((vec *) common_deferred_options); int reg, nregs, j; FOR_EACH_VEC_ELT (v, i, opt) { switch (opt->opt_index) { case OPT_ffixed_: case OPT_fcall_used_: case OPT_fcall_saved_: if ((reg = decode_reg_name_and_count (opt->arg, &nregs)) >= 0) for (j = reg; j < reg + nregs; j++) SET_HARD_REG_BIT (overrideregs, j); break; default: break; } } } /* Check options against architecture options. Throw an error if option is not allowed. Extra, check options against default architecture/cpu flags and throw an warning if we find a mismatch. */ /* TRANSLATORS: the DOC/DOC0/DOC1 are strings which shouldn't be translated. They are like keywords which one can relate with the architectural choices taken for an ARC CPU implementation. */ #define ARC_OPTX(NAME, CODE, VAR, VAL, DOC0, DOC1) \ do { \ if ((!(arc_selected_cpu->arch_info->flags & CODE)) \ && (VAR == VAL)) \ error ("option %<%s=%s%> is not available for %qs CPU", \ DOC0, DOC1, arc_selected_cpu->name); \ if ((arc_selected_cpu->arch_info->dflags & CODE) \ && (VAR != DEFAULT_##VAR) \ && (VAR != VAL)) \ warning (0, "option %qs is ignored, the default value %qs" \ " is considered for %qs CPU", DOC0, DOC1, \ arc_selected_cpu->name); \ } while (0); #define ARC_OPT(NAME, CODE, MASK, DOC) \ do { \ if ((!(arc_selected_cpu->arch_info->flags & CODE)) \ && (target_flags & MASK)) \ error ("option %qs is not available for %qs CPU", \ DOC, arc_selected_cpu->name); \ if ((arc_selected_cpu->arch_info->dflags & CODE) \ && (target_flags_explicit & MASK) \ && (!(target_flags & MASK))) \ warning (0, "unset option %qs is ignored, it is always" \ " enabled for %qs CPU", DOC, \ arc_selected_cpu->name); \ } while (0); #include "arc-options.def" #undef ARC_OPTX #undef ARC_OPT /* Set cpu flags accordingly to architecture/selected cpu. The cpu specific flags are set in arc-common.c. The architecture forces the default hardware configurations in, regardless what command line options are saying. The CPU optional hw options can be turned on or off. */ #define ARC_OPT(NAME, CODE, MASK, DOC) \ do { \ if ((arc_selected_cpu->flags & CODE) \ && ((target_flags_explicit & MASK) == 0)) \ target_flags |= MASK; \ if (arc_selected_cpu->arch_info->dflags & CODE) \ target_flags |= MASK; \ } while (0); #define ARC_OPTX(NAME, CODE, VAR, VAL, DOC0, DOC1) \ do { \ if ((arc_selected_cpu->flags & CODE) \ && (VAR == DEFAULT_##VAR)) \ VAR = VAL; \ if (arc_selected_cpu->arch_info->dflags & CODE) \ VAR = VAL; \ } while (0); #include "arc-options.def" #undef ARC_OPTX #undef ARC_OPT /* Set extras. */ switch (arc_selected_cpu->extra) { case HAS_LPCOUNT_16: arc_lpcwidth = 16; break; default: break; } /* Set Tune option. */ if (arc_tune == ARC_TUNE_NONE) arc_tune = (enum arc_tune_attr) arc_selected_cpu->tune; if (arc_size_opt_level == 3) optimize_size = 1; if (TARGET_V2 && optimize_size && (ATTRIBUTE_PCS == 2)) TARGET_CODE_DENSITY_FRAME = 1; if (flag_pic) target_flags |= MASK_NO_SDATA_SET; if (flag_no_common == 255) flag_no_common = !TARGET_NO_SDATA_SET; /* Check for small data option */ if (!global_options_set.x_g_switch_value && !TARGET_NO_SDATA_SET) g_switch_value = TARGET_LL64 ? 8 : 4; /* A7 has an issue with delay slots. */ if (TARGET_ARC700 && (arc_tune != ARC_TUNE_ARC7XX)) flag_delayed_branch = 0; /* Millicode thunks doesn't work with long calls. */ if (TARGET_LONG_CALLS_SET) target_flags &= ~MASK_MILLICODE_THUNK_SET; /* Set unaligned to all HS cpus. */ if (!global_options_set.x_unaligned_access && TARGET_HS) unaligned_access = 1; /* These need to be done at start up. It's convenient to do them here. */ arc_init (); } /* The condition codes of the ARC, and the inverse function. */ /* For short branches, the "c" / "nc" names are not defined in the ARC Programmers manual, so we have to use "lo" / "hs"" instead. */ static const char *arc_condition_codes[] = { "al", 0, "eq", "ne", "p", "n", "lo", "hs", "v", "nv", "gt", "le", "ge", "lt", "hi", "ls", "pnz", 0 }; enum arc_cc_code_index { ARC_CC_AL, ARC_CC_EQ = ARC_CC_AL+2, ARC_CC_NE, ARC_CC_P, ARC_CC_N, ARC_CC_C, ARC_CC_NC, ARC_CC_V, ARC_CC_NV, ARC_CC_GT, ARC_CC_LE, ARC_CC_GE, ARC_CC_LT, ARC_CC_HI, ARC_CC_LS, ARC_CC_PNZ, ARC_CC_LO = ARC_CC_C, ARC_CC_HS = ARC_CC_NC }; #define ARC_INVERSE_CONDITION_CODE(X) ((X) ^ 1) /* Returns the index of the ARC condition code string in `arc_condition_codes'. COMPARISON should be an rtx like `(eq (...) (...))'. */ static int get_arc_condition_code (rtx comparison) { switch (GET_MODE (XEXP (comparison, 0))) { case E_CCmode: case E_SImode: /* For BRcc. */ switch (GET_CODE (comparison)) { case EQ : return ARC_CC_EQ; case NE : return ARC_CC_NE; case GT : return ARC_CC_GT; case LE : return ARC_CC_LE; case GE : return ARC_CC_GE; case LT : return ARC_CC_LT; case GTU : return ARC_CC_HI; case LEU : return ARC_CC_LS; case LTU : return ARC_CC_LO; case GEU : return ARC_CC_HS; default : gcc_unreachable (); } case E_CC_ZNmode: switch (GET_CODE (comparison)) { case EQ : return ARC_CC_EQ; case NE : return ARC_CC_NE; case GE: return ARC_CC_P; case LT: return ARC_CC_N; case GT : return ARC_CC_PNZ; default : gcc_unreachable (); } case E_CC_Zmode: switch (GET_CODE (comparison)) { case EQ : return ARC_CC_EQ; case NE : return ARC_CC_NE; default : gcc_unreachable (); } case E_CC_Cmode: switch (GET_CODE (comparison)) { case LTU : return ARC_CC_C; case GEU : return ARC_CC_NC; default : gcc_unreachable (); } case E_CC_FP_GTmode: if (TARGET_ARGONAUT_SET && TARGET_SPFP) switch (GET_CODE (comparison)) { case GT : return ARC_CC_N; case UNLE: return ARC_CC_P; default : gcc_unreachable (); } else switch (GET_CODE (comparison)) { case GT : return ARC_CC_HI; case UNLE : return ARC_CC_LS; default : gcc_unreachable (); } case E_CC_FP_GEmode: /* Same for FPX and non-FPX. */ switch (GET_CODE (comparison)) { case GE : return ARC_CC_HS; case UNLT : return ARC_CC_LO; default : gcc_unreachable (); } case E_CC_FP_UNEQmode: switch (GET_CODE (comparison)) { case UNEQ : return ARC_CC_EQ; case LTGT : return ARC_CC_NE; default : gcc_unreachable (); } case E_CC_FP_ORDmode: switch (GET_CODE (comparison)) { case UNORDERED : return ARC_CC_C; case ORDERED : return ARC_CC_NC; default : gcc_unreachable (); } case E_CC_FPXmode: switch (GET_CODE (comparison)) { case EQ : return ARC_CC_EQ; case NE : return ARC_CC_NE; case UNORDERED : return ARC_CC_C; case ORDERED : return ARC_CC_NC; case LTGT : return ARC_CC_HI; case UNEQ : return ARC_CC_LS; default : gcc_unreachable (); } case E_CC_FPUmode: case E_CC_FPUEmode: switch (GET_CODE (comparison)) { case EQ : return ARC_CC_EQ; case NE : return ARC_CC_NE; case GT : return ARC_CC_GT; case GE : return ARC_CC_GE; case LT : return ARC_CC_C; case LE : return ARC_CC_LS; case UNORDERED : return ARC_CC_V; case ORDERED : return ARC_CC_NV; case UNGT : return ARC_CC_HI; case UNGE : return ARC_CC_HS; case UNLT : return ARC_CC_LT; case UNLE : return ARC_CC_LE; /* UNEQ and LTGT do not have representation. */ case LTGT : /* Fall through. */ case UNEQ : /* Fall through. */ default : gcc_unreachable (); } case E_CC_FPU_UNEQmode: switch (GET_CODE (comparison)) { case LTGT : return ARC_CC_NE; case UNEQ : return ARC_CC_EQ; default : gcc_unreachable (); } default : gcc_unreachable (); } /*NOTREACHED*/ return (42); } /* Return true if COMPARISON has a short form that can accomodate OFFSET. */ bool arc_short_comparison_p (rtx comparison, int offset) { gcc_assert (ARC_CC_NC == ARC_CC_HS); gcc_assert (ARC_CC_C == ARC_CC_LO); switch (get_arc_condition_code (comparison)) { case ARC_CC_EQ: case ARC_CC_NE: return offset >= -512 && offset <= 506; case ARC_CC_GT: case ARC_CC_LE: case ARC_CC_GE: case ARC_CC_LT: case ARC_CC_HI: case ARC_CC_LS: case ARC_CC_LO: case ARC_CC_HS: return offset >= -64 && offset <= 58; default: return false; } } /* Given a comparison code (EQ, NE, etc.) and the first operand of a COMPARE, return the mode to be used for the comparison. */ machine_mode arc_select_cc_mode (enum rtx_code op, rtx x, rtx y) { machine_mode mode = GET_MODE (x); rtx x1; /* For an operation that sets the condition codes as a side-effect, the C and V flags is not set as for cmp, so we can only use comparisons where this doesn't matter. (For LT and GE we can use "mi" and "pl" instead.) */ /* ??? We could use "pnz" for greater than zero, however, we could then get into trouble because the comparison could not be reversed. */ if (GET_MODE_CLASS (mode) == MODE_INT && y == const0_rtx && (op == EQ || op == NE || ((op == LT || op == GE) && GET_MODE_SIZE (GET_MODE (x)) <= 4))) return CC_ZNmode; /* add.f for if (a+b) */ if (mode == SImode && GET_CODE (y) == NEG && (op == EQ || op == NE)) return CC_ZNmode; /* Check if this is a test suitable for bxor.f . */ if (mode == SImode && (op == EQ || op == NE) && CONST_INT_P (y) && ((INTVAL (y) - 1) & INTVAL (y)) == 0 && INTVAL (y)) return CC_Zmode; /* Check if this is a test suitable for add / bmsk.f . */ if (mode == SImode && (op == EQ || op == NE) && CONST_INT_P (y) && GET_CODE (x) == AND && CONST_INT_P ((x1 = XEXP (x, 1))) && ((INTVAL (x1) + 1) & INTVAL (x1)) == 0 && (~INTVAL (x1) | INTVAL (y)) < 0 && (~INTVAL (x1) | INTVAL (y)) > -0x800) return CC_Zmode; if (GET_MODE (x) == SImode && (op == LTU || op == GEU) && GET_CODE (x) == PLUS && (rtx_equal_p (XEXP (x, 0), y) || rtx_equal_p (XEXP (x, 1), y))) return CC_Cmode; if (TARGET_ARGONAUT_SET && ((mode == SFmode && TARGET_SPFP) || (mode == DFmode && TARGET_DPFP))) switch (op) { case EQ: case NE: case UNEQ: case LTGT: case ORDERED: case UNORDERED: return CC_FPXmode; case LT: case UNGE: case GT: case UNLE: return CC_FP_GTmode; case LE: case UNGT: case GE: case UNLT: return CC_FP_GEmode; default: gcc_unreachable (); } else if (TARGET_HARD_FLOAT && ((mode == SFmode && TARGET_FP_SP_BASE) || (mode == DFmode && TARGET_FP_DP_BASE))) switch (op) { case EQ: case NE: case UNORDERED: case ORDERED: case UNLT: case UNLE: case UNGT: case UNGE: return CC_FPUmode; case LT: case LE: case GT: case GE: return CC_FPUEmode; case LTGT: case UNEQ: return CC_FPU_UNEQmode; default: gcc_unreachable (); } else if (GET_MODE_CLASS (mode) == MODE_FLOAT && TARGET_OPTFPE) { switch (op) { case EQ: case NE: return CC_Zmode; case LT: case UNGE: case GT: case UNLE: return CC_FP_GTmode; case LE: case UNGT: case GE: case UNLT: return CC_FP_GEmode; case UNEQ: case LTGT: return CC_FP_UNEQmode; case ORDERED: case UNORDERED: return CC_FP_ORDmode; default: gcc_unreachable (); } } return CCmode; } /* Vectors to keep interesting information about registers where it can easily be got. We use to use the actual mode value as the bit number, but there is (or may be) more than 32 modes now. Instead we use two tables: one indexed by hard register number, and one indexed by mode. */ /* The purpose of arc_mode_class is to shrink the range of modes so that they all fit (as bit numbers) in a 32-bit word (again). Each real mode is mapped into one arc_mode_class mode. */ enum arc_mode_class { C_MODE, S_MODE, D_MODE, T_MODE, O_MODE, SF_MODE, DF_MODE, TF_MODE, OF_MODE, V_MODE }; /* Modes for condition codes. */ #define C_MODES (1 << (int) C_MODE) /* Modes for single-word and smaller quantities. */ #define S_MODES ((1 << (int) S_MODE) | (1 << (int) SF_MODE)) /* Modes for double-word and smaller quantities. */ #define D_MODES (S_MODES | (1 << (int) D_MODE) | (1 << DF_MODE)) /* Mode for 8-byte DF values only. */ #define DF_MODES (1 << DF_MODE) /* Modes for quad-word and smaller quantities. */ #define T_MODES (D_MODES | (1 << (int) T_MODE) | (1 << (int) TF_MODE)) /* Modes for 128-bit vectors. */ #define V_MODES (1 << (int) V_MODE) /* Value is 1 if register/mode pair is acceptable on arc. */ static unsigned int arc_hard_regno_modes[] = { T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, T_MODES, D_MODES, D_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, /* ??? Leave these as S_MODES for now. */ S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, DF_MODES, 0, DF_MODES, 0, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, C_MODES, S_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, V_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES, S_MODES }; static unsigned int arc_mode_class [NUM_MACHINE_MODES]; enum reg_class arc_regno_reg_class[FIRST_PSEUDO_REGISTER]; enum reg_class arc_preferred_reload_class (rtx, enum reg_class cl) { return cl; } /* Initialize the arc_mode_class array. */ static void arc_init_reg_tables (void) { int i; for (i = 0; i < NUM_MACHINE_MODES; i++) { machine_mode m = (machine_mode) i; switch (GET_MODE_CLASS (m)) { case MODE_INT: case MODE_PARTIAL_INT: case MODE_COMPLEX_INT: if (GET_MODE_SIZE (m) <= 4) arc_mode_class[i] = 1 << (int) S_MODE; else if (GET_MODE_SIZE (m) == 8) arc_mode_class[i] = 1 << (int) D_MODE; else if (GET_MODE_SIZE (m) == 16) arc_mode_class[i] = 1 << (int) T_MODE; else if (GET_MODE_SIZE (m) == 32) arc_mode_class[i] = 1 << (int) O_MODE; else arc_mode_class[i] = 0; break; case MODE_FLOAT: case MODE_COMPLEX_FLOAT: if (GET_MODE_SIZE (m) <= 4) arc_mode_class[i] = 1 << (int) SF_MODE; else if (GET_MODE_SIZE (m) == 8) arc_mode_class[i] = 1 << (int) DF_MODE; else if (GET_MODE_SIZE (m) == 16) arc_mode_class[i] = 1 << (int) TF_MODE; else if (GET_MODE_SIZE (m) == 32) arc_mode_class[i] = 1 << (int) OF_MODE; else arc_mode_class[i] = 0; break; case MODE_VECTOR_INT: if (GET_MODE_SIZE (m) == 4) arc_mode_class[i] = (1 << (int) S_MODE); else if (GET_MODE_SIZE (m) == 8) arc_mode_class[i] = (1 << (int) D_MODE); else arc_mode_class[i] = (1 << (int) V_MODE); break; case MODE_CC: default: /* mode_class hasn't been initialized yet for EXTRA_CC_MODES, so we must explicitly check for them here. */ if (i == (int) CCmode || i == (int) CC_ZNmode || i == (int) CC_Zmode || i == (int) CC_Cmode || i == CC_FP_GTmode || i == CC_FP_GEmode || i == CC_FP_ORDmode || i == CC_FPUmode || i == CC_FPUEmode || i == CC_FPU_UNEQmode) arc_mode_class[i] = 1 << (int) C_MODE; else arc_mode_class[i] = 0; break; } } } /* Core registers 56..59 are used for multiply extension options. The dsp option uses r56 and r57, these are then named acc1 and acc2. acc1 is the highpart, and acc2 the lowpart, so which register gets which number depends on endianness. The mul64 multiplier options use r57 for mlo, r58 for mmid and r59 for mhi. Because mlo / mhi form a 64 bit value, we use different gcc internal register numbers to make them form a register pair as the gcc internals know it. mmid gets number 57, if still available, and mlo / mhi get number 58 and 59, depending on endianness. We use DBX_REGISTER_NUMBER to map this back. */ char rname56[5] = "r56"; char rname57[5] = "r57"; char rname58[5] = "r58"; char rname59[5] = "r59"; char rname29[7] = "ilink1"; char rname30[7] = "ilink2"; static void arc_conditional_register_usage (void) { int regno; int i; int fix_start = 60, fix_end = 55; if (TARGET_V2) { /* For ARCv2 the core register set is changed. */ strcpy (rname29, "ilink"); strcpy (rname30, "r30"); if (!TEST_HARD_REG_BIT (overrideregs, R30_REG)) { /* No user interference. Set the r30 to be used by the compiler. */ call_used_regs[R30_REG] = 1; fixed_regs[R30_REG] = 0; arc_regno_reg_class[R30_REG] = GENERAL_REGS; } } if (TARGET_MUL64_SET) { fix_start = R57_REG; fix_end = R59_REG; /* We don't provide a name for mmed. In rtl / assembly resource lists, you are supposed to refer to it as mlo & mhi, e.g (zero_extract:SI (reg:DI 58) (const_int 32) (16)) . In an actual asm instruction, you are of course use mmed. The point of avoiding having a separate register for mmed is that this way, we don't have to carry clobbers of that reg around in every isntruction that modifies mlo and/or mhi. */ strcpy (rname57, ""); strcpy (rname58, "mlo"); strcpy (rname59, "mhi"); } /* The nature of arc_tp_regno is actually something more like a global register, however globalize_reg requires a declaration. We use EPILOGUE_USES to compensate so that sets from __builtin_set_frame_pointer are not deleted. */ if (arc_tp_regno != -1) fixed_regs[arc_tp_regno] = call_used_regs[arc_tp_regno] = 1; if (TARGET_MULMAC_32BY16_SET) { fix_start = MUL32x16_REG; fix_end = fix_end > R57_REG ? fix_end : R57_REG; strcpy (rname56, TARGET_BIG_ENDIAN ? "acc1" : "acc2"); strcpy (rname57, TARGET_BIG_ENDIAN ? "acc2" : "acc1"); } for (regno = fix_start; regno <= fix_end; regno++) { if (!fixed_regs[regno]) warning (0, "multiply option implies r%d is fixed", regno); fixed_regs [regno] = call_used_regs[regno] = 1; } /* Reduced configuration: don't use r4-r9, r16-r25. */ if (TARGET_RF16) { for (i = R4_REG; i <= R9_REG; i++) fixed_regs[i] = call_used_regs[i] = 1; for (i = R16_REG; i <= R25_REG; i++) fixed_regs[i] = call_used_regs[i] = 1; } /* ARCHS has 64-bit data-path which makes use of the even-odd paired registers. */ if (TARGET_HS) for (regno = R1_REG; regno < R32_REG; regno +=2) arc_hard_regno_modes[regno] = S_MODES; for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) if (i < ILINK1_REG) { if ((i <= R3_REG) || ((i >= R12_REG) && (i <= R15_REG))) arc_regno_reg_class[i] = ARCOMPACT16_REGS; else arc_regno_reg_class[i] = GENERAL_REGS; } else if (i < LP_COUNT) arc_regno_reg_class[i] = GENERAL_REGS; else arc_regno_reg_class[i] = NO_REGS; /* Handle Special Registers. */ arc_regno_reg_class[CC_REG] = NO_REGS; /* CC_REG: must be NO_REGS. */ arc_regno_reg_class[FRAME_POINTER_REGNUM] = GENERAL_REGS; arc_regno_reg_class[ARG_POINTER_REGNUM] = GENERAL_REGS; if (TARGET_DPFP) for (i = R40_REG; i < R44_REG; ++i) { arc_regno_reg_class[i] = DOUBLE_REGS; if (!TARGET_ARGONAUT_SET) CLEAR_HARD_REG_BIT (reg_class_contents[GENERAL_REGS], i); } else { /* Disable all DOUBLE_REGISTER settings, if not generating DPFP code. */ arc_regno_reg_class[R40_REG] = ALL_REGS; arc_regno_reg_class[R41_REG] = ALL_REGS; arc_regno_reg_class[R42_REG] = ALL_REGS; arc_regno_reg_class[R43_REG] = ALL_REGS; fixed_regs[R40_REG] = 1; fixed_regs[R41_REG] = 1; fixed_regs[R42_REG] = 1; fixed_regs[R43_REG] = 1; arc_hard_regno_modes[R40_REG] = 0; arc_hard_regno_modes[R42_REG] = 0; } if (TARGET_SIMD_SET) { gcc_assert (ARC_FIRST_SIMD_VR_REG == 64); gcc_assert (ARC_LAST_SIMD_VR_REG == 127); for (i = ARC_FIRST_SIMD_VR_REG; i <= ARC_LAST_SIMD_VR_REG; i++) arc_regno_reg_class [i] = SIMD_VR_REGS; gcc_assert (ARC_FIRST_SIMD_DMA_CONFIG_REG == 128); gcc_assert (ARC_FIRST_SIMD_DMA_CONFIG_IN_REG == 128); gcc_assert (ARC_FIRST_SIMD_DMA_CONFIG_OUT_REG == 136); gcc_assert (ARC_LAST_SIMD_DMA_CONFIG_REG == 143); for (i = ARC_FIRST_SIMD_DMA_CONFIG_REG; i <= ARC_LAST_SIMD_DMA_CONFIG_REG; i++) arc_regno_reg_class [i] = SIMD_DMA_CONFIG_REGS; } /* pc : r63 */ arc_regno_reg_class[PCL_REG] = NO_REGS; /*ARCV2 Accumulator. */ if ((TARGET_V2 && (TARGET_FP_DP_FUSED || TARGET_FP_SP_FUSED)) || TARGET_PLUS_DMPY) { arc_regno_reg_class[ACCL_REGNO] = GENERAL_REGS; arc_regno_reg_class[ACCH_REGNO] = GENERAL_REGS; /* Allow the compiler to freely use them. */ if (!TEST_HARD_REG_BIT (overrideregs, ACCL_REGNO)) fixed_regs[ACCL_REGNO] = 0; if (!TEST_HARD_REG_BIT (overrideregs, ACCH_REGNO)) fixed_regs[ACCH_REGNO] = 0; if (!fixed_regs[ACCH_REGNO] && !fixed_regs[ACCL_REGNO]) arc_hard_regno_modes[ACC_REG_FIRST] = D_MODES; } } /* Implement TARGET_HARD_REGNO_NREGS. */ static unsigned int arc_hard_regno_nregs (unsigned int regno, machine_mode mode) { if (GET_MODE_SIZE (mode) == 16 && regno >= ARC_FIRST_SIMD_VR_REG && regno <= ARC_LAST_SIMD_VR_REG) return 1; return CEIL (GET_MODE_SIZE (mode), UNITS_PER_WORD); } /* Implement TARGET_HARD_REGNO_MODE_OK. */ static bool arc_hard_regno_mode_ok (unsigned int regno, machine_mode mode) { return (arc_hard_regno_modes[regno] & arc_mode_class[mode]) != 0; } /* Implement TARGET_MODES_TIEABLE_P. Tie QI/HI/SI modes together. */ static bool arc_modes_tieable_p (machine_mode mode1, machine_mode mode2) { return (GET_MODE_CLASS (mode1) == MODE_INT && GET_MODE_CLASS (mode2) == MODE_INT && GET_MODE_SIZE (mode1) <= UNITS_PER_WORD && GET_MODE_SIZE (mode2) <= UNITS_PER_WORD); } /* Handle an "interrupt" attribute; arguments as in struct attribute_spec.handler. */ static tree arc_handle_interrupt_attribute (tree *, tree name, tree args, int, bool *no_add_attrs) { gcc_assert (args); tree value = TREE_VALUE (args); if (TREE_CODE (value) != STRING_CST) { warning (OPT_Wattributes, "argument of %qE attribute is not a string constant", name); *no_add_attrs = true; } else if (!TARGET_V2 && strcmp (TREE_STRING_POINTER (value), "ilink1") && strcmp (TREE_STRING_POINTER (value), "ilink2")) { warning (OPT_Wattributes, "argument of %qE attribute is not \"ilink1\" or \"ilink2\"", name); *no_add_attrs = true; } else if (TARGET_V2 && strcmp (TREE_STRING_POINTER (value), "ilink") && strcmp (TREE_STRING_POINTER (value), "firq")) { warning (OPT_Wattributes, "argument of %qE attribute is not \"ilink\" or \"firq\"", name); *no_add_attrs = true; } return NULL_TREE; } static tree arc_handle_fndecl_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) { if (TREE_CODE (*node) != FUNCTION_DECL) { warning (OPT_Wattributes, "%qE attribute only applies to functions", name); *no_add_attrs = true; } return NULL_TREE; } /* Type of function DECL. The result is cached. To reset the cache at the end of a function, call with DECL = NULL_TREE. */ static unsigned int arc_compute_function_type (struct function *fun) { tree attr, decl = fun->decl; unsigned int fn_type = fun->machine->fn_type; if (fn_type != ARC_FUNCTION_UNKNOWN) return fn_type; /* Check if it is a naked function. */ if (lookup_attribute ("naked", DECL_ATTRIBUTES (decl)) != NULL_TREE) fn_type |= ARC_FUNCTION_NAKED; else fn_type |= ARC_FUNCTION_NORMAL; /* Now see if this is an interrupt handler. */ attr = lookup_attribute ("interrupt", DECL_ATTRIBUTES (decl)); if (attr != NULL_TREE) { tree value, args = TREE_VALUE (attr); gcc_assert (list_length (args) == 1); value = TREE_VALUE (args); gcc_assert (TREE_CODE (value) == STRING_CST); if (!strcmp (TREE_STRING_POINTER (value), "ilink1") || !strcmp (TREE_STRING_POINTER (value), "ilink")) fn_type |= ARC_FUNCTION_ILINK1; else if (!strcmp (TREE_STRING_POINTER (value), "ilink2")) fn_type |= ARC_FUNCTION_ILINK2; else if (!strcmp (TREE_STRING_POINTER (value), "firq")) fn_type |= ARC_FUNCTION_FIRQ; else gcc_unreachable (); } return fun->machine->fn_type = fn_type; } /* Implement `TARGET_ALLOCATE_STACK_SLOTS_FOR_ARGS' */ static bool arc_allocate_stack_slots_for_args (void) { /* Naked functions should not allocate stack slots for arguments. */ unsigned int fn_type = arc_compute_function_type (cfun); return !ARC_NAKED_P(fn_type); } /* Implement `TARGET_WARN_FUNC_RETURN'. */ static bool arc_warn_func_return (tree decl) { struct function *func = DECL_STRUCT_FUNCTION (decl); unsigned int fn_type = arc_compute_function_type (func); return !ARC_NAKED_P (fn_type); } /* Return zero if TYPE1 and TYPE are incompatible, one if they are compatible, and two if they are nearly compatible (which causes a warning to be generated). */ static int arc_comp_type_attributes (const_tree type1, const_tree type2) { int l1, l2, m1, m2, s1, s2; /* Check for mismatch of non-default calling convention. */ if (TREE_CODE (type1) != FUNCTION_TYPE) return 1; /* Check for mismatched call attributes. */ l1 = lookup_attribute ("long_call", TYPE_ATTRIBUTES (type1)) != NULL; l2 = lookup_attribute ("long_call", TYPE_ATTRIBUTES (type2)) != NULL; m1 = lookup_attribute ("medium_call", TYPE_ATTRIBUTES (type1)) != NULL; m2 = lookup_attribute ("medium_call", TYPE_ATTRIBUTES (type2)) != NULL; s1 = lookup_attribute ("short_call", TYPE_ATTRIBUTES (type1)) != NULL; s2 = lookup_attribute ("short_call", TYPE_ATTRIBUTES (type2)) != NULL; /* Only bother to check if an attribute is defined. */ if (l1 | l2 | m1 | m2 | s1 | s2) { /* If one type has an attribute, the other must have the same attribute. */ if ((l1 != l2) || (m1 != m2) || (s1 != s2)) return 0; /* Disallow mixed attributes. */ if (l1 + m1 + s1 > 1) return 0; } return 1; } /* Misc. utilities. */ /* X and Y are two things to compare using CODE. Emit the compare insn and return the rtx for the cc reg in the proper mode. */ rtx gen_compare_reg (rtx comparison, machine_mode omode) { enum rtx_code code = GET_CODE (comparison); rtx x = XEXP (comparison, 0); rtx y = XEXP (comparison, 1); rtx tmp, cc_reg; machine_mode mode, cmode; cmode = GET_MODE (x); if (cmode == VOIDmode) cmode = GET_MODE (y); gcc_assert (cmode == SImode || cmode == SFmode || cmode == DFmode); if (cmode == SImode) { if (!register_operand (x, SImode)) { if (register_operand (y, SImode)) { tmp = x; x = y; y = tmp; code = swap_condition (code); } else x = copy_to_mode_reg (SImode, x); } if (GET_CODE (y) == SYMBOL_REF && flag_pic) y = copy_to_mode_reg (SImode, y); } else { x = force_reg (cmode, x); y = force_reg (cmode, y); } mode = SELECT_CC_MODE (code, x, y); cc_reg = gen_rtx_REG (mode, CC_REG); /* ??? FIXME (x-y)==0, as done by both cmpsfpx_raw and cmpdfpx_raw, is not a correct comparison for floats: http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm */ if (TARGET_ARGONAUT_SET && ((cmode == SFmode && TARGET_SPFP) || (cmode == DFmode && TARGET_DPFP))) { switch (code) { case NE: case EQ: case LT: case UNGE: case LE: case UNGT: case UNEQ: case LTGT: case ORDERED: case UNORDERED: break; case GT: case UNLE: case GE: case UNLT: code = swap_condition (code); tmp = x; x = y; y = tmp; break; default: gcc_unreachable (); } if (cmode == SFmode) { emit_insn (gen_cmpsfpx_raw (x, y)); } else /* DFmode */ { /* Accepts Dx regs directly by insns. */ emit_insn (gen_cmpdfpx_raw (x, y)); } if (mode != CC_FPXmode) emit_insn (gen_rtx_SET (cc_reg, gen_rtx_COMPARE (mode, gen_rtx_REG (CC_FPXmode, 61), const0_rtx))); } else if (TARGET_FPX_QUARK && (cmode == SFmode)) { switch (code) { case NE: case EQ: case GT: case UNLE: case GE: case UNLT: case UNEQ: case LTGT: case ORDERED: case UNORDERED: break; case LT: case UNGE: case LE: case UNGT: code = swap_condition (code); tmp = x; x = y; y = tmp; break; default: gcc_unreachable (); } emit_insn (gen_cmp_quark (cc_reg, gen_rtx_COMPARE (mode, x, y))); } else if (TARGET_HARD_FLOAT && ((cmode == SFmode && TARGET_FP_SP_BASE) || (cmode == DFmode && TARGET_FP_DP_BASE))) emit_insn (gen_rtx_SET (cc_reg, gen_rtx_COMPARE (mode, x, y))); else if (GET_MODE_CLASS (cmode) == MODE_FLOAT && TARGET_OPTFPE) { rtx op0 = gen_rtx_REG (cmode, 0); rtx op1 = gen_rtx_REG (cmode, GET_MODE_SIZE (cmode) / UNITS_PER_WORD); bool swap = false; switch (code) { case NE: case EQ: case GT: case UNLE: case GE: case UNLT: case UNEQ: case LTGT: case ORDERED: case UNORDERED: break; case LT: case UNGE: case LE: case UNGT: code = swap_condition (code); swap = true; break; default: gcc_unreachable (); } if (currently_expanding_to_rtl) { if (swap) { tmp = x; x = y; y = tmp; } emit_move_insn (op0, x); emit_move_insn (op1, y); } else { gcc_assert (rtx_equal_p (op0, x)); gcc_assert (rtx_equal_p (op1, y)); if (swap) { op0 = y; op1 = x; } } emit_insn (gen_cmp_float (cc_reg, gen_rtx_COMPARE (mode, op0, op1))); } else emit_insn (gen_rtx_SET (cc_reg, gen_rtx_COMPARE (mode, x, y))); return gen_rtx_fmt_ee (code, omode, cc_reg, const0_rtx); } /* Return true if VALUE, a const_double, will fit in a limm (4 byte number). We assume the value can be either signed or unsigned. */ bool arc_double_limm_p (rtx value) { HOST_WIDE_INT low, high; gcc_assert (GET_CODE (value) == CONST_DOUBLE); if (TARGET_DPFP) return true; low = CONST_DOUBLE_LOW (value); high = CONST_DOUBLE_HIGH (value); if (low & 0x80000000) { return (((unsigned HOST_WIDE_INT) low <= 0xffffffff && high == 0) || (((low & - (unsigned HOST_WIDE_INT) 0x80000000) == - (unsigned HOST_WIDE_INT) 0x80000000) && high == -1)); } else { return (unsigned HOST_WIDE_INT) low <= 0x7fffffff && high == 0; } } /* Do any needed setup for a variadic function. For the ARC, we must create a register parameter block, and then copy any anonymous arguments in registers to memory. CUM has not been updated for the last named argument (which is given by ARG), and we rely on this fact. */ static void arc_setup_incoming_varargs (cumulative_args_t args_so_far, const function_arg_info &arg, int *pretend_size, int no_rtl) { int first_anon_arg; CUMULATIVE_ARGS next_cum; /* We must treat `__builtin_va_alist' as an anonymous arg. */ next_cum = *get_cumulative_args (args_so_far); arc_function_arg_advance (pack_cumulative_args (&next_cum), arg); first_anon_arg = next_cum; if (FUNCTION_ARG_REGNO_P (first_anon_arg)) { /* First anonymous (unnamed) argument is in a reg. */ /* Note that first_reg_offset < MAX_ARC_PARM_REGS. */ int first_reg_offset = first_anon_arg; if (!no_rtl) { rtx regblock = gen_rtx_MEM (BLKmode, plus_constant (Pmode, arg_pointer_rtx, FIRST_PARM_OFFSET (0))); move_block_from_reg (first_reg_offset, regblock, MAX_ARC_PARM_REGS - first_reg_offset); } *pretend_size = ((MAX_ARC_PARM_REGS - first_reg_offset ) * UNITS_PER_WORD); } } /* Cost functions. */ /* Provide the costs of an addressing mode that contains ADDR. If ADDR is not a valid address, its cost is irrelevant. */ static int arc_address_cost (rtx addr, machine_mode, addr_space_t, bool speed) { switch (GET_CODE (addr)) { case REG : return speed || satisfies_constraint_Rcq (addr) ? 0 : 1; case PRE_INC: case PRE_DEC: case POST_INC: case POST_DEC: case PRE_MODIFY: case POST_MODIFY: return !speed; case LABEL_REF : case SYMBOL_REF : case CONST : if (TARGET_NPS_CMEM && cmem_address (addr, SImode)) return 0; /* Most likely needs a LIMM. */ return COSTS_N_INSNS (1); case PLUS : { register rtx plus0 = XEXP (addr, 0); register rtx plus1 = XEXP (addr, 1); if (GET_CODE (plus0) != REG && (GET_CODE (plus0) != MULT || !CONST_INT_P (XEXP (plus0, 1)) || (INTVAL (XEXP (plus0, 1)) != 2 && INTVAL (XEXP (plus0, 1)) != 4))) break; switch (GET_CODE (plus1)) { case CONST_INT : return (!RTX_OK_FOR_OFFSET_P (SImode, plus1) ? COSTS_N_INSNS (1) : speed ? 0 : (satisfies_constraint_Rcq (plus0) && satisfies_constraint_O (plus1)) ? 0 : 1); case REG: return (speed < 1 ? 0 : (satisfies_constraint_Rcq (plus0) && satisfies_constraint_Rcq (plus1)) ? 0 : 1); case CONST : case SYMBOL_REF : case LABEL_REF : return COSTS_N_INSNS (1); default: break; } break; } default: break; } return 4; } /* Emit instruction X with the frame related bit set. */ static rtx frame_insn (rtx x) { x = emit_insn (x); RTX_FRAME_RELATED_P (x) = 1; return x; } /* Emit a frame insn to move SRC to DST. */ static rtx frame_move (rtx dst, rtx src) { rtx tmp = gen_rtx_SET (dst, src); RTX_FRAME_RELATED_P (tmp) = 1; return frame_insn (tmp); } /* Like frame_move, but add a REG_INC note for REG if ADDR contains an auto increment address, or is zero. */ static rtx frame_move_inc (rtx dst, rtx src, rtx reg, rtx addr) { rtx insn = frame_move (dst, src); if (!addr || GET_CODE (addr) == PRE_DEC || GET_CODE (addr) == POST_INC || GET_CODE (addr) == PRE_MODIFY || GET_CODE (addr) == POST_MODIFY) add_reg_note (insn, REG_INC, reg); return insn; } /* Emit a frame insn which adjusts a frame address register REG by OFFSET. */ static rtx frame_add (rtx reg, HOST_WIDE_INT offset) { gcc_assert ((offset & 0x3) == 0); if (!offset) return NULL_RTX; return frame_move (reg, plus_constant (Pmode, reg, offset)); } /* Emit a frame insn which adjusts stack pointer by OFFSET. */ static rtx frame_stack_add (HOST_WIDE_INT offset) { return frame_add (stack_pointer_rtx, offset); } /* Helper function to wrap FRAME_POINTER_NEEDED. We do this as FRAME_POINTER_NEEDED will not be true until the IRA (Integrated Register Allocator) pass, while we want to get the frame size correct earlier than the IRA pass. When a function uses eh_return we must ensure that the fp register is saved and then restored so that the unwinder can restore the correct value for the frame we are going to jump to. To do this we force all frames that call eh_return to require a frame pointer (see arc_frame_pointer_required), this will ensure that the previous frame pointer is stored on entry to the function, and will then be reloaded at function exit. As the frame pointer is handled as a special case in our prologue and epilogue code it must not be saved and restored using the MUST_SAVE_REGISTER mechanism otherwise we run into issues where GCC believes that the function is not using a frame pointer and that the value in the fp register is the frame pointer, while the prologue and epilogue are busy saving and restoring the fp register. During compilation of a function the frame size is evaluated multiple times, it is not until the reload pass is complete the frame size is considered fixed (it is at this point that space for all spills has been allocated). However the frame_pointer_needed variable is not set true until the register allocation pass, as a result in the early stages the frame size does not include space for the frame pointer to be spilled. The problem that this causes is that the rtl generated for EH_RETURN_HANDLER_RTX uses the details of the frame size to compute the offset from the frame pointer at which the return address lives. However, in early passes GCC has not yet realised we need a frame pointer, and so has not included space for the frame pointer in the frame size, and so gets the offset of the return address wrong. This should not be an issue as in later passes GCC has realised that the frame pointer needs to be spilled, and has increased the frame size. However, the rtl for the EH_RETURN_HANDLER_RTX is not regenerated to use the newer, larger offset, and the wrong smaller offset is used. */ static bool arc_frame_pointer_needed (void) { return (frame_pointer_needed || crtl->calls_eh_return); } /* Tell prologue and epilogue if register REGNO should be saved / restored. The SPECIAL_P is true when the register may need special ld/st sequence. The return address, and stack pointer are treated separately. Don't consider them here. */ static bool arc_must_save_register (int regno, struct function *func, bool special_p) { unsigned int fn_type = arc_compute_function_type (func); bool irq_auto_save_p = ((irq_ctrl_saved.irq_save_last_reg >= regno) && ARC_AUTO_IRQ_P (fn_type)); bool firq_auto_save_p = ARC_FAST_INTERRUPT_P (fn_type); switch (rgf_banked_register_count) { case 4: firq_auto_save_p &= (regno < 4); break; case 8: firq_auto_save_p &= ((regno < 4) || ((regno > 11) && (regno < 16))); break; case 16: firq_auto_save_p &= ((regno < 4) || ((regno > 9) && (regno < 16)) || ((regno > 25) && (regno < 29)) || ((regno > 29) && (regno < 32))); break; case 32: firq_auto_save_p &= (regno != 29) && (regno < 32); break; default: firq_auto_save_p = false; break; } switch (regno) { case ILINK1_REG: case RETURN_ADDR_REGNUM: case STACK_POINTER_REGNUM: /* The stack pointer and the return address are handled separately. */ return false; case R30_REG: /* r30 is either used as ilink2 by ARCv1 or as a free register by ARCv2. */ if (!TARGET_V2) return false; break; case R40_REG: case R41_REG: case R42_REG: case R43_REG: case R44_REG: /* If those ones are used by the FPX machinery, we handle them separately. */ if (TARGET_DPFP && !special_p) return false; /* FALLTHRU. */ case R32_REG: case R33_REG: case R34_REG: case R35_REG: case R36_REG: case R37_REG: case R38_REG: case R39_REG: case R45_REG: case R46_REG: case R47_REG: case R48_REG: case R49_REG: case R50_REG: case R51_REG: case R52_REG: case R53_REG: case R54_REG: case R55_REG: case R56_REG: case R57_REG: /* The Extension Registers. */ if (ARC_INTERRUPT_P (fn_type) && (df_regs_ever_live_p (RETURN_ADDR_REGNUM) || df_regs_ever_live_p (regno)) /* Not all extension registers are available, choose the real ones. */ && !fixed_regs[regno]) return true; return false; case R58_REG: case R59_REG: /* ARC600 specifies those ones as mlo/mhi registers, otherwise just handle them like any other extension register. */ if (ARC_INTERRUPT_P (fn_type) && (df_regs_ever_live_p (RETURN_ADDR_REGNUM) || df_regs_ever_live_p (regno)) /* Not all extension registers are available, choose the real ones. */ && ((!fixed_regs[regno] && !special_p) || (TARGET_MUL64_SET && special_p))) return true; return false; case 61: case 62: case 63: /* Fixed/control register, nothing to do. LP_COUNT is different. */ return false; case HARD_FRAME_POINTER_REGNUM: /* If we need FP reg as a frame pointer then don't save it as a regular reg. */ if (arc_frame_pointer_needed ()) return false; break; default: break; } if (((df_regs_ever_live_p (regno) && !call_used_or_fixed_reg_p (regno)) /* In an interrupt save everything. */ || (ARC_INTERRUPT_P (fn_type) && (df_regs_ever_live_p (RETURN_ADDR_REGNUM) || df_regs_ever_live_p (regno)))) /* Do not emit code for auto saved regs. */ && !irq_auto_save_p && !firq_auto_save_p) return true; return false; } /* Return true if the return address must be saved in the current function, otherwise return false. */ static bool arc_must_save_return_addr (struct function *func) { if (func->machine->frame_info.save_return_addr) return true; return false; } /* Return non-zero if there are registers to be saved or loaded using millicode thunks. We can only use consecutive sequences starting with r13, and not going beyond r25. GMASK is a bitmask of registers to save. This function sets FRAME->millicod_start_reg .. FRAME->millicode_end_reg to the range of registers to be saved / restored with a millicode call. */ static int arc_compute_millicode_save_restore_regs (uint64_t gmask, struct arc_frame_info *frame) { int regno; int start_reg = 13, end_reg = 25; for (regno = start_reg; regno <= end_reg && (gmask & (1ULL << regno));) regno++; end_reg = regno - 1; /* There is no point in using millicode thunks if we don't save/restore at least three registers. For non-leaf functions we also have the blink restore. */ if (regno - start_reg >= 3 - (crtl->is_leaf == 0)) { frame->millicode_start_reg = 13; frame->millicode_end_reg = regno - 1; return 1; } return 0; } /* Return the bytes needed to compute the frame pointer from the current stack pointer. */ static unsigned int arc_compute_frame_size (void) { int regno; unsigned int total_size, var_size, args_size, pretend_size, extra_size; unsigned int reg_size; uint64_t gmask; struct arc_frame_info *frame_info; int size; unsigned int extra_plus_reg_size; unsigned int extra_plus_reg_size_aligned; unsigned int fn_type = arc_compute_function_type (cfun); /* The answer might already be known. */ if (cfun->machine->frame_info.initialized) return cfun->machine->frame_info.total_size; frame_info = &cfun->machine->frame_info; size = ARC_STACK_ALIGN (get_frame_size ()); /* 1) Size of locals and temporaries. */ var_size = size; /* 2) Size of outgoing arguments. */ args_size = crtl->outgoing_args_size; /* 3) Calculate space needed for saved registers. ??? We ignore the extension registers for now. */ /* See if this is an interrupt handler. Call used registers must be saved for them too. */ reg_size = 0; gmask = 0; /* The last 4 regs are special, avoid them. */ for (regno = 0; regno <= (GMASK_LEN - 4); regno++) { if (arc_must_save_register (regno, cfun, false)) { reg_size += UNITS_PER_WORD; gmask |= 1ULL << regno; } } /* In a frame that calls __builtin_eh_return two data registers are used to pass values back to the exception handler. Ensure that these registers are spilled to the stack so that the exception throw code can find them, and update the saved values. The handling code will then consume these reloaded values to handle the exception. */ if (crtl->calls_eh_return) for (regno = 0; EH_RETURN_DATA_REGNO (regno) != INVALID_REGNUM; regno++) { reg_size += UNITS_PER_WORD; gmask |= 1ULL << regno; } /* Check if we need to save the return address. */ frame_info->save_return_addr = (!crtl->is_leaf || df_regs_ever_live_p (RETURN_ADDR_REGNUM) || crtl->calls_eh_return); /* Saving blink reg for millicode thunk calls. */ if (TARGET_MILLICODE_THUNK_SET && !ARC_INTERRUPT_P (fn_type) && !crtl->calls_eh_return) { if (arc_compute_millicode_save_restore_regs (gmask, frame_info)) frame_info->save_return_addr = true; } /* Save lp_count, lp_start and lp_end. */ if (arc_lpcwidth != 0 && arc_must_save_register (LP_COUNT, cfun, true)) reg_size += UNITS_PER_WORD * 3; /* Check for the special R40-R44 regs used by FPX extension. */ if (arc_must_save_register (TARGET_BIG_ENDIAN ? R41_REG : R40_REG, cfun, TARGET_DPFP)) reg_size += UNITS_PER_WORD * 2; if (arc_must_save_register (TARGET_BIG_ENDIAN ? R43_REG : R42_REG, cfun, TARGET_DPFP)) reg_size += UNITS_PER_WORD * 2; /* Check for special MLO/MHI case used by ARC600' MUL64 extension. */ if (arc_must_save_register (R58_REG, cfun, TARGET_MUL64_SET)) reg_size += UNITS_PER_WORD * 2; /* 4) Calculate extra size made up of the blink + fp size. */ extra_size = 0; if (arc_must_save_return_addr (cfun)) extra_size = 4; /* Add FP size only when it is not autosaved. */ if (arc_frame_pointer_needed () && !ARC_AUTOFP_IRQ_P (fn_type)) extra_size += 4; /* 5) Space for variable arguments passed in registers */ pretend_size = crtl->args.pretend_args_size; /* Ensure everything before the locals is aligned appropriately. */ extra_plus_reg_size = extra_size + reg_size; extra_plus_reg_size_aligned = ARC_STACK_ALIGN (extra_plus_reg_size); reg_size = extra_plus_reg_size_aligned - extra_size; /* Compute total frame size. */ total_size = var_size + args_size + extra_size + pretend_size + reg_size; /* It used to be the case that the alignment was forced at this point. However, that is dangerous, calculations based on total_size would be wrong. Given that this has never cropped up as an issue I've changed this to an assert for now. */ gcc_assert (total_size == ARC_STACK_ALIGN (total_size)); /* Save computed information. */ frame_info->total_size = total_size; frame_info->extra_size = extra_size; frame_info->pretend_size = pretend_size; frame_info->var_size = var_size; frame_info->args_size = args_size; frame_info->reg_size = reg_size; frame_info->gmask = gmask; frame_info->initialized = reload_completed; /* Ok, we're done. */ return total_size; } /* Build dwarf information when the context is saved via AUX_IRQ_CTRL mechanism. */ static void arc_dwarf_emit_irq_save_regs (void) { rtx tmp, par, insn, reg; int i, offset, j; par = gen_rtx_SEQUENCE (VOIDmode, rtvec_alloc (irq_ctrl_saved.irq_save_last_reg + 1 + irq_ctrl_saved.irq_save_blink + irq_ctrl_saved.irq_save_lpcount + 1)); /* Build the stack adjustment note for unwind info. */ j = 0; offset = UNITS_PER_WORD * (irq_ctrl_saved.irq_save_last_reg + 1 + irq_ctrl_saved.irq_save_blink + irq_ctrl_saved.irq_save_lpcount); tmp = plus_constant (Pmode, stack_pointer_rtx, -1 * offset); tmp = gen_rtx_SET (stack_pointer_rtx, tmp); RTX_FRAME_RELATED_P (tmp) = 1; XVECEXP (par, 0, j++) = tmp; offset -= UNITS_PER_WORD; /* 1st goes LP_COUNT. */ if (irq_ctrl_saved.irq_save_lpcount) { reg = gen_rtx_REG (SImode, 60); tmp = plus_constant (Pmode, stack_pointer_rtx, offset); tmp = gen_frame_mem (SImode, tmp); tmp = gen_rtx_SET (tmp, reg); RTX_FRAME_RELATED_P (tmp) = 1; XVECEXP (par, 0, j++) = tmp; offset -= UNITS_PER_WORD; } /* 2nd goes BLINK. */ if (irq_ctrl_saved.irq_save_blink) { reg = gen_rtx_REG (SImode, 31); tmp = plus_constant (Pmode, stack_pointer_rtx, offset); tmp = gen_frame_mem (SImode, tmp); tmp = gen_rtx_SET (tmp, reg); RTX_FRAME_RELATED_P (tmp) = 1; XVECEXP (par, 0, j++) = tmp; offset -= UNITS_PER_WORD; } /* Build the parallel of the remaining registers recorded as saved for unwind. */ for (i = irq_ctrl_saved.irq_save_last_reg; i >= 0; i--) { reg = gen_rtx_REG (SImode, i); tmp = plus_constant (Pmode, stack_pointer_rtx, offset); tmp = gen_frame_mem (SImode, tmp); tmp = gen_rtx_SET (tmp, reg); RTX_FRAME_RELATED_P (tmp) = 1; XVECEXP (par, 0, j++) = tmp; offset -= UNITS_PER_WORD; } /* Dummy insn used to anchor the dwarf info. */ insn = emit_insn (gen_stack_irq_dwarf()); add_reg_note (insn, REG_FRAME_RELATED_EXPR, par); RTX_FRAME_RELATED_P (insn) = 1; } /* Helper for prologue: emit frame store with pre_modify or pre_dec to save register REG on stack. An initial offset OFFSET can be passed to the function. */ static int frame_save_reg (rtx reg, HOST_WIDE_INT offset) { rtx addr; if (offset) { rtx tmp = plus_constant (Pmode, stack_pointer_rtx, offset - GET_MODE_SIZE (GET_MODE (reg))); addr = gen_frame_mem (GET_MODE (reg), gen_rtx_PRE_MODIFY (Pmode, stack_pointer_rtx, tmp)); } else addr = gen_frame_mem (GET_MODE (reg), gen_rtx_PRE_DEC (Pmode, stack_pointer_rtx)); frame_move_inc (addr, reg, stack_pointer_rtx, 0); return GET_MODE_SIZE (GET_MODE (reg)) - offset; } /* Helper used when saving AUX regs during ISR. */ static int push_reg (rtx reg) { rtx stkslot = gen_rtx_MEM (GET_MODE (reg), gen_rtx_PRE_DEC (Pmode, stack_pointer_rtx)); rtx insn = emit_move_insn (stkslot, reg); RTX_FRAME_RELATED_P (insn) = 1; add_reg_note (insn, REG_CFA_ADJUST_CFA, gen_rtx_SET (stack_pointer_rtx, plus_constant (Pmode, stack_pointer_rtx, -GET_MODE_SIZE (GET_MODE (reg))))); return GET_MODE_SIZE (GET_MODE (reg)); } /* Helper for epilogue: emit frame load with post_modify or post_inc to restore register REG from stack. The initial offset is passed via OFFSET. */ static int frame_restore_reg (rtx reg, HOST_WIDE_INT offset) { rtx addr, insn; if (offset) { rtx tmp = plus_constant (Pmode, stack_pointer_rtx, offset + GET_MODE_SIZE (GET_MODE (reg))); addr = gen_frame_mem (GET_MODE (reg), gen_rtx_POST_MODIFY (Pmode, stack_pointer_rtx, tmp)); } else addr = gen_frame_mem (GET_MODE (reg), gen_rtx_POST_INC (Pmode, stack_pointer_rtx)); insn = frame_move_inc (reg, addr, stack_pointer_rtx, 0); add_reg_note (insn, REG_CFA_RESTORE, reg); if (reg == hard_frame_pointer_rtx) add_reg_note (insn, REG_CFA_DEF_CFA, plus_constant (Pmode, stack_pointer_rtx, GET_MODE_SIZE (GET_MODE (reg)) + offset)); else add_reg_note (insn, REG_CFA_ADJUST_CFA, gen_rtx_SET (stack_pointer_rtx, plus_constant (Pmode, stack_pointer_rtx, GET_MODE_SIZE (GET_MODE (reg)) + offset))); return GET_MODE_SIZE (GET_MODE (reg)) + offset; } /* Helper used when restoring AUX regs during ISR. */ static int pop_reg (rtx reg) { rtx stkslot = gen_rtx_MEM (GET_MODE (reg), gen_rtx_POST_INC (Pmode, stack_pointer_rtx)); rtx insn = emit_move_insn (reg, stkslot); RTX_FRAME_RELATED_P (insn) = 1; add_reg_note (insn, REG_CFA_ADJUST_CFA, gen_rtx_SET (stack_pointer_rtx, plus_constant (Pmode, stack_pointer_rtx, GET_MODE_SIZE (GET_MODE (reg))))); return GET_MODE_SIZE (GET_MODE (reg)); } /* Check if we have a continous range to be save/restored with the help of enter/leave instructions. A vaild register range starts from $r13 and is up to (including) $r26. */ static bool arc_enter_leave_p (uint64_t gmask) { int regno; unsigned int rmask = 0; if (!gmask) return false; for (regno = ENTER_LEAVE_START_REG; regno <= ENTER_LEAVE_END_REG && (gmask & (1ULL << regno)); regno++) rmask |= 1ULL << regno; if (rmask ^ gmask) return false; return true; } /* ARC's prologue, save any needed call-saved regs (and call-used if this is an interrupt handler) for ARCompact ISA, using ST/STD instructions. */ static int arc_save_callee_saves (uint64_t gmask, bool save_blink, bool save_fp, HOST_WIDE_INT offset, bool emit_move) { rtx reg; int frame_allocated = 0; int i; /* The home-grown ABI says link register is saved first. */ if (save_blink) { reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM); frame_allocated += frame_save_reg (reg, offset); offset = 0; } /* N.B. FRAME_POINTER_MASK and RETURN_ADDR_MASK are cleared in gmask. */ if (gmask) for (i = GMASK_LEN; i >= 0; i--) { machine_mode save_mode = SImode; if (TARGET_LL64 && ((i - 1) % 2 == 0) && ((gmask & (1ULL << i)) != 0) && ((gmask & (1ULL << (i - 1))) != 0)) { save_mode = DImode; --i; } else if ((gmask & (1ULL << i)) == 0) continue; reg = gen_rtx_REG (save_mode, i); frame_allocated += frame_save_reg (reg, offset); offset = 0; } /* Save frame pointer if needed. First save the FP on stack, if not autosaved. Unfortunately, I cannot add it to gmask and use the above loop to save fp because our ABI states fp goes aftert all registers are saved. */ if (save_fp) { frame_allocated += frame_save_reg (hard_frame_pointer_rtx, offset); offset = 0; } /* Emit mov fp,sp. */ if (emit_move) frame_move (hard_frame_pointer_rtx, stack_pointer_rtx); return frame_allocated; } /* ARC's epilogue, restore any required call-saved regs (and call-used if it is for an interrupt handler) using LD/LDD instructions. */ static int arc_restore_callee_saves (uint64_t gmask, bool restore_blink, bool restore_fp, HOST_WIDE_INT offset, HOST_WIDE_INT allocated) { rtx reg; int frame_deallocated = 0; HOST_WIDE_INT offs = cfun->machine->frame_info.reg_size; unsigned int fn_type = arc_compute_function_type (cfun); bool early_blink_restore; int i; /* Emit mov fp,sp. */ if (arc_frame_pointer_needed () && offset) { frame_move (stack_pointer_rtx, hard_frame_pointer_rtx); frame_deallocated += offset; offset = 0; } if (restore_fp) { /* Any offset is taken care by previous if-statement. */ gcc_assert (offset == 0); frame_deallocated += frame_restore_reg (hard_frame_pointer_rtx, 0); } if (offset) { /* No $fp involved, we need to do an add to set the $sp to the location of the first register. */ frame_stack_add (offset); frame_deallocated += offset; offset = 0; } /* When we do not optimize for size or we aren't in an interrupt, restore first blink. */ early_blink_restore = restore_blink && !optimize_size && offs && !ARC_INTERRUPT_P (fn_type); if (early_blink_restore) { rtx addr = plus_constant (Pmode, stack_pointer_rtx, offs); reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM); rtx insn = frame_move_inc (reg, gen_frame_mem (Pmode, addr), stack_pointer_rtx, NULL_RTX); add_reg_note (insn, REG_CFA_RESTORE, reg); restore_blink = false; } /* N.B. FRAME_POINTER_MASK and RETURN_ADDR_MASK are cleared in gmask. */ if (gmask) for (i = 0; i <= GMASK_LEN; i++) { machine_mode restore_mode = SImode; if (TARGET_LL64 && ((i % 2) == 0) && ((gmask & (1ULL << i)) != 0) && ((gmask & (1ULL << (i + 1))) != 0)) restore_mode = DImode; else if ((gmask & (1ULL << i)) == 0) continue; reg = gen_rtx_REG (restore_mode, i); offs = 0; switch (restore_mode) { case E_DImode: if ((GMASK_LEN - __builtin_clzll (gmask)) == (i + 1) && early_blink_restore) offs = 4; break; case E_SImode: if ((GMASK_LEN - __builtin_clzll (gmask)) == i && early_blink_restore) offs = 4; break; default: offs = 0; } frame_deallocated += frame_restore_reg (reg, offs); offset = 0; if (restore_mode == DImode) i++; } if (restore_blink) { reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM); frame_deallocated += frame_restore_reg (reg, allocated - frame_deallocated /* Consider as well the current restored register size. */ - UNITS_PER_WORD); } return frame_deallocated; } /* ARC prologue, save the registers using enter instruction. Leave instruction can also save $blink (SAVE_BLINK) and $fp (SAVE_FP) register. */ static int arc_save_callee_enter (uint64_t gmask, bool save_blink, bool save_fp, HOST_WIDE_INT offset) { int start_reg = ENTER_LEAVE_START_REG; int end_reg = ENTER_LEAVE_END_REG; int regno, indx, off, nregs; rtx insn, reg, mem; int frame_allocated = 0; for (regno = start_reg; regno <= end_reg && (gmask & (1ULL << regno));) regno++; end_reg = regno - 1; nregs = end_reg - start_reg + 1; nregs += save_blink ? 1 : 0; nregs += save_fp ? 1 : 0; if (offset) frame_stack_add (offset); insn = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (nregs + (save_fp ? 1 : 0) + 1)); indx = 0; reg = gen_rtx_SET (stack_pointer_rtx, plus_constant (Pmode, stack_pointer_rtx, -nregs * UNITS_PER_WORD)); RTX_FRAME_RELATED_P (reg) = 1; XVECEXP (insn, 0, indx++) = reg; off = nregs * UNITS_PER_WORD; if (save_blink) { reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM); mem = gen_frame_mem (Pmode, plus_constant (Pmode, stack_pointer_rtx, off)); XVECEXP (insn, 0, indx) = gen_rtx_SET (mem, reg); RTX_FRAME_RELATED_P (XVECEXP (insn, 0, indx++)) = 1; off -= UNITS_PER_WORD; save_blink = false; } for (regno = start_reg; regno <= end_reg; regno++, indx++, off -= UNITS_PER_WORD) { reg = gen_rtx_REG (SImode, regno); mem = gen_frame_mem (SImode, plus_constant (Pmode, stack_pointer_rtx, off)); XVECEXP (insn, 0, indx) = gen_rtx_SET (mem, reg); RTX_FRAME_RELATED_P (XVECEXP (insn, 0, indx)) = 1; gmask = gmask & ~(1ULL << regno); } if (save_fp) { mem = gen_frame_mem (Pmode, plus_constant (Pmode, stack_pointer_rtx, off)); XVECEXP (insn, 0, indx) = gen_rtx_SET (mem, hard_frame_pointer_rtx); RTX_FRAME_RELATED_P (XVECEXP (insn, 0, indx++)) = 1; off -= UNITS_PER_WORD; XVECEXP (insn, 0, indx) = gen_rtx_SET (hard_frame_pointer_rtx, stack_pointer_rtx); RTX_FRAME_RELATED_P (XVECEXP (insn, 0, indx++)) = 1; save_fp = false; } gcc_assert (off == 0); insn = frame_insn (insn); add_reg_note (insn, REG_INC, stack_pointer_rtx); frame_allocated = nregs * UNITS_PER_WORD; /* offset is a negative number, make sure we add it. */ return frame_allocated - offset; } /* ARC epilogue, restore the registers using leave instruction. An initial offset is passed in OFFSET. Besides restoring an register range, leave can also restore $blink (RESTORE_BLINK), or $fp (RESTORE_FP), and can automatic return (RETURN_P). */ static int arc_restore_callee_leave (uint64_t gmask, bool restore_blink, bool restore_fp, bool return_p, HOST_WIDE_INT offset) { int start_reg = ENTER_LEAVE_START_REG; int end_reg = ENTER_LEAVE_END_REG; int regno, indx, off, nregs; rtx insn, reg, mem; int frame_allocated = 0; for (regno = start_reg; regno <= end_reg && (gmask & (1ULL << regno));) regno++; end_reg = regno - 1; nregs = end_reg - start_reg + 1; nregs += restore_blink ? 1 : 0; nregs += restore_fp ? 1 : 0; insn = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (nregs + 1 + (return_p ? 1 : 0))); indx = 0; if (return_p) XVECEXP (insn, 0, indx++) = ret_rtx; if (restore_fp) { /* I cannot emit set (sp, fp) here as cselib expects a single sp set and not two. Thus, use the offset, and change sp adjust value. */ frame_allocated += offset; } if (offset && !restore_fp) { /* This add is only emmited when we do not restore fp with leave instruction. */ frame_stack_add (offset); frame_allocated += offset; offset = 0; } reg = gen_rtx_SET (stack_pointer_rtx, plus_constant (Pmode, stack_pointer_rtx, offset + nregs * UNITS_PER_WORD)); RTX_FRAME_RELATED_P (reg) = 1; XVECEXP (insn, 0, indx++) = reg; off = nregs * UNITS_PER_WORD; if (restore_blink) { reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM); mem = gen_frame_mem (Pmode, plus_constant (Pmode, stack_pointer_rtx, off)); XVECEXP (insn, 0, indx) = gen_rtx_SET (reg, mem); RTX_FRAME_RELATED_P (XVECEXP (insn, 0, indx++)) = 1; off -= UNITS_PER_WORD; } for (regno = start_reg; regno <= end_reg; regno++, indx++, off -= UNITS_PER_WORD) { reg = gen_rtx_REG (SImode, regno); mem = gen_frame_mem (SImode, plus_constant (Pmode, stack_pointer_rtx, off)); XVECEXP (insn, 0, indx) = gen_rtx_SET (reg, mem); RTX_FRAME_RELATED_P (XVECEXP (insn, 0, indx)) = 1; gmask = gmask & ~(1ULL << regno); } if (restore_fp) { mem = gen_frame_mem (Pmode, plus_constant (Pmode, stack_pointer_rtx, off)); XVECEXP (insn, 0, indx) = gen_rtx_SET (hard_frame_pointer_rtx, mem); RTX_FRAME_RELATED_P (XVECEXP (insn, 0, indx++)) = 1; off -= UNITS_PER_WORD; } gcc_assert (off == 0); if (return_p) { insn = emit_jump_insn (insn); RTX_FRAME_RELATED_P (insn) = 1; } else insn = frame_insn (insn); add_reg_note (insn, REG_INC, stack_pointer_rtx); /* Dwarf related info. */ if (restore_fp) { add_reg_note (insn, REG_CFA_RESTORE, hard_frame_pointer_rtx); add_reg_note (insn, REG_CFA_DEF_CFA, plus_constant (Pmode, stack_pointer_rtx, offset + nregs * UNITS_PER_WORD)); } else { add_reg_note (insn, REG_CFA_ADJUST_CFA, gen_rtx_SET (stack_pointer_rtx, plus_constant (Pmode, stack_pointer_rtx, nregs * UNITS_PER_WORD))); } if (restore_blink) add_reg_note (insn, REG_CFA_RESTORE, gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM)); for (regno = start_reg; regno <= end_reg; regno++) add_reg_note (insn, REG_CFA_RESTORE, gen_rtx_REG (SImode, regno)); frame_allocated += nregs * UNITS_PER_WORD; return frame_allocated; } /* Millicode thunks implementation: Generates calls to millicodes for registers starting from r13 to r25 Present Limitations: - Only one range supported. The remaining regs will have the ordinary st and ld instructions for store and loads. Hence a gmask asking to store r13-14, r16-r25 will only generate calls to store and load r13 to r14 while store and load insns will be generated for r16 to r25 in the prologue and epilogue respectively. - Presently library only supports register ranges starting from r13. */ static int arc_save_callee_milli (uint64_t gmask, bool save_blink, bool save_fp, HOST_WIDE_INT offset, HOST_WIDE_INT reg_size) { int start_reg = 13; int end_reg = 25; int regno, indx, off, nregs; rtx insn, reg, mem; int frame_allocated = 0; for (regno = start_reg; regno <= end_reg && (gmask & (1ULL << regno));) regno++; end_reg = regno - 1; nregs = end_reg - start_reg + 1; gcc_assert (end_reg > 14); /* Allocate space on stack for the registers, and take into account also the initial offset. The registers will be saved using offsets. N.B. OFFSET is a negative number. */ if (save_blink) { reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM); frame_allocated += frame_save_reg (reg, offset); offset = 0; } if (reg_size || offset) { frame_stack_add (offset - reg_size); frame_allocated += nregs * UNITS_PER_WORD - offset; offset = 0; } /* Start generate millicode call. */ insn = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (nregs + 1)); indx = 0; /* This is a call, we clobber blink. */ XVECEXP (insn, 0, nregs) = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM)); for (regno = start_reg, indx = 0, off = 0; regno <= end_reg; regno++, indx++, off += UNITS_PER_WORD) { reg = gen_rtx_REG (SImode, regno); mem = gen_frame_mem (SImode, plus_constant (Pmode, stack_pointer_rtx, off)); XVECEXP (insn, 0, indx) = gen_rtx_SET (mem, reg); RTX_FRAME_RELATED_P (XVECEXP (insn, 0, indx)) = 1; gmask = gmask & ~(1ULL << regno); } insn = frame_insn (insn); /* Add DWARF info. */ for (regno = start_reg, off = 0; regno <= end_reg; regno++, off += UNITS_PER_WORD) { reg = gen_rtx_REG (SImode, regno); mem = gen_rtx_MEM (SImode, plus_constant (Pmode, stack_pointer_rtx, off)); add_reg_note (insn, REG_CFA_OFFSET, gen_rtx_SET (mem, reg)); } /* In the case of millicode thunk, we need to restore the clobbered blink register. */ if (arc_must_save_return_addr (cfun)) { emit_insn (gen_rtx_SET (gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM), gen_rtx_MEM (Pmode, plus_constant (Pmode, stack_pointer_rtx, reg_size)))); } /* Save remaining registers using st instructions. */ for (regno = 0; regno <= GMASK_LEN; regno++) { if ((gmask & (1ULL << regno)) == 0) continue; reg = gen_rtx_REG (SImode, regno); mem = gen_frame_mem (SImode, plus_constant (Pmode, stack_pointer_rtx, off)); frame_move_inc (mem, reg, stack_pointer_rtx, 0); frame_allocated += UNITS_PER_WORD; off += UNITS_PER_WORD; } /* Save frame pointer if needed. First save the FP on stack, if not autosaved. Unfortunately, I cannot add it to gmask and use the above loop to save fp because our ABI states fp goes aftert all registers are saved. */ if (save_fp) frame_allocated += frame_save_reg (hard_frame_pointer_rtx, offset); /* Emit mov fp,sp. */ if (arc_frame_pointer_needed ()) frame_move (hard_frame_pointer_rtx, stack_pointer_rtx); return frame_allocated; } /* Like the previous function but restore. */ static int arc_restore_callee_milli (uint64_t gmask, bool restore_blink, bool restore_fp, bool return_p, HOST_WIDE_INT offset) { int start_reg = 13; int end_reg = 25; int regno, indx, off, nregs; rtx insn, reg, mem; int frame_allocated = 0; for (regno = start_reg; regno <= end_reg && (gmask & (1ULL << regno));) regno++; end_reg = regno - 1; nregs = end_reg - start_reg + 1; gcc_assert (end_reg > 14); /* Emit mov fp,sp. */ if (arc_frame_pointer_needed () && offset) { frame_move (stack_pointer_rtx, hard_frame_pointer_rtx); frame_allocated = offset; offset = 0; } if (restore_fp) frame_allocated += frame_restore_reg (hard_frame_pointer_rtx, 0); if (offset) { /* No fp involved, hence, we need to adjust the sp via an add. */ frame_stack_add (offset); frame_allocated += offset; offset = 0; } /* Start generate millicode call. */ insn = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc ((return_p ? 1 : 0) + nregs + 1)); indx = 0; if (return_p) { /* sibling call, the blink is restored with the help of the value held into r12. */ reg = gen_rtx_REG (Pmode, 12); XVECEXP (insn, 0, indx++) = ret_rtx; XVECEXP (insn, 0, indx++) = gen_rtx_SET (stack_pointer_rtx, gen_rtx_PLUS (Pmode, stack_pointer_rtx, reg)); frame_allocated += UNITS_PER_WORD; } else { /* This is a call, we clobber blink. */ XVECEXP (insn, 0, nregs) = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM)); } for (regno = start_reg, off = 0; regno <= end_reg; regno++, indx++, off += UNITS_PER_WORD) { reg = gen_rtx_REG (SImode, regno); mem = gen_frame_mem (SImode, plus_constant (Pmode, stack_pointer_rtx, off)); XVECEXP (insn, 0, indx) = gen_rtx_SET (reg, mem); RTX_FRAME_RELATED_P (XVECEXP (insn, 0, indx)) = 1; gmask = gmask & ~(1ULL << regno); } /* Restore remaining registers using LD instructions. */ for (regno = 0; regno <= GMASK_LEN; regno++) { if ((gmask & (1ULL << regno)) == 0) continue; reg = gen_rtx_REG (SImode, regno); mem = gen_frame_mem (SImode, plus_constant (Pmode, stack_pointer_rtx, off)); rtx tmp = frame_move_inc (reg, mem, stack_pointer_rtx, 0); add_reg_note (tmp, REG_CFA_RESTORE, reg); off += UNITS_PER_WORD; } /* Emit millicode call. */ if (return_p) { reg = gen_rtx_REG (Pmode, 12); frame_insn (gen_rtx_SET (reg, GEN_INT (off))); frame_allocated += off; insn = emit_jump_insn (insn); RTX_FRAME_RELATED_P (insn) = 1; } else insn = frame_insn (insn); /* Add DWARF info. */ for (regno = start_reg; regno <= end_reg; regno++) { reg = gen_rtx_REG (SImode, regno); add_reg_note (insn, REG_CFA_RESTORE, reg); } if (restore_blink && !return_p) { reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM); mem = gen_frame_mem (Pmode, plus_constant (Pmode, stack_pointer_rtx, off)); insn = frame_insn (gen_rtx_SET (reg, mem)); add_reg_note (insn, REG_CFA_RESTORE, reg); } return frame_allocated; } /* Set up the stack and frame pointer (if desired) for the function. */ void arc_expand_prologue (void) { int size; uint64_t gmask = cfun->machine->frame_info.gmask; struct arc_frame_info *frame = &cfun->machine->frame_info; unsigned int frame_size_to_allocate; int first_offset = 0; unsigned int fn_type = arc_compute_function_type (cfun); bool save_blink = false; bool save_fp = false; bool emit_move = false; /* Naked functions don't have prologue. */ if (ARC_NAKED_P (fn_type)) { if (flag_stack_usage_info) current_function_static_stack_size = 0; return; } /* Compute total frame size. */ size = arc_compute_frame_size (); if (flag_stack_usage_info) current_function_static_stack_size = size; /* Keep track of frame size to be allocated. */ frame_size_to_allocate = size; /* These cases shouldn't happen. Catch them now. */ gcc_assert (!(size == 0 && gmask)); /* Allocate space for register arguments if this is a variadic function. */ if (frame->pretend_size != 0) first_offset = -frame->pretend_size; /* IRQ using automatic save mechanism will save the register before anything we do. */ if (ARC_AUTO_IRQ_P (fn_type) && !ARC_FAST_INTERRUPT_P (fn_type)) { frame_stack_add (first_offset); first_offset = 0; arc_dwarf_emit_irq_save_regs (); } save_blink = arc_must_save_return_addr (cfun) && !ARC_AUTOBLINK_IRQ_P (fn_type); save_fp = arc_frame_pointer_needed () && !ARC_AUTOFP_IRQ_P (fn_type) && !ARC_INTERRUPT_P (fn_type); emit_move = arc_frame_pointer_needed () && !ARC_INTERRUPT_P (fn_type); /* Use enter/leave only for non-interrupt functions. */ if (TARGET_CODE_DENSITY && TARGET_CODE_DENSITY_FRAME && !ARC_AUTOFP_IRQ_P (fn_type) && !ARC_AUTOBLINK_IRQ_P (fn_type) && !ARC_INTERRUPT_P (fn_type) && arc_enter_leave_p (gmask)) frame_size_to_allocate -= arc_save_callee_enter (gmask, save_blink, save_fp, first_offset); else if (frame->millicode_end_reg > 14) frame_size_to_allocate -= arc_save_callee_milli (gmask, save_blink, save_fp, first_offset, frame->reg_size); else frame_size_to_allocate -= arc_save_callee_saves (gmask, save_blink, save_fp, first_offset, emit_move); /* Check if we need to save the ZOL machinery. */ if (arc_lpcwidth != 0 && arc_must_save_register (LP_COUNT, cfun, true)) { rtx reg0 = gen_rtx_REG (SImode, R0_REG); emit_insn (gen_rtx_SET (reg0, gen_rtx_UNSPEC_VOLATILE (Pmode, gen_rtvec (1, GEN_INT (AUX_LP_START)), VUNSPEC_ARC_LR))); frame_size_to_allocate -= push_reg (reg0); emit_insn (gen_rtx_SET (reg0, gen_rtx_UNSPEC_VOLATILE (Pmode, gen_rtvec (1, GEN_INT (AUX_LP_END)), VUNSPEC_ARC_LR))); frame_size_to_allocate -= push_reg (reg0); emit_move_insn (reg0, gen_rtx_REG (SImode, LP_COUNT)); frame_size_to_allocate -= push_reg (reg0); } /* Save AUX regs used by FPX machinery. */ if (arc_must_save_register (TARGET_BIG_ENDIAN ? R41_REG : R40_REG, cfun, TARGET_DPFP)) { rtx reg0 = gen_rtx_REG (SImode, R0_REG); int i; for (i = 0; i < 4; i++) { emit_insn (gen_rtx_SET (reg0, gen_rtx_UNSPEC_VOLATILE (Pmode, gen_rtvec (1, GEN_INT (AUX_DPFP_START + i)), VUNSPEC_ARC_LR))); frame_size_to_allocate -= push_reg (reg0); } } /* Save ARC600' MUL64 registers. */ if (arc_must_save_register (R58_REG, cfun, true)) frame_size_to_allocate -= arc_save_callee_saves (3ULL << 58, false, false, 0, false); if (arc_frame_pointer_needed () && ARC_INTERRUPT_P (fn_type)) { /* Just save fp at the end of the saving context. */ frame_size_to_allocate -= arc_save_callee_saves (0, false, !ARC_AUTOFP_IRQ_P (fn_type), 0, true); } /* Allocate the stack frame. */ if (frame_size_to_allocate > 0) frame_stack_add ((HOST_WIDE_INT) 0 - frame_size_to_allocate); /* Emit a blockage to avoid delay slot scheduling. */ emit_insn (gen_blockage ()); } /* Return the register number of the register holding the return address for a function of type TYPE. */ static int arc_return_address_register (unsigned int fn_type) { int regno = 0; if (ARC_INTERRUPT_P (fn_type)) { if ((fn_type & (ARC_FUNCTION_ILINK1 | ARC_FUNCTION_FIRQ)) != 0) regno = ILINK1_REG; else if ((fn_type & ARC_FUNCTION_ILINK2) != 0) regno = ILINK2_REG; else gcc_unreachable (); } else if (ARC_NORMAL_P (fn_type) || ARC_NAKED_P (fn_type)) regno = RETURN_ADDR_REGNUM; gcc_assert (regno != 0); return regno; } /* Do any necessary cleanup after a function to restore stack, frame, and regs. */ void arc_expand_epilogue (int sibcall_p) { int size; unsigned int fn_type = arc_compute_function_type (cfun); unsigned int size_to_deallocate; int restored; int can_trust_sp_p = !cfun->calls_alloca; int first_offset; bool restore_fp = arc_frame_pointer_needed () && !ARC_AUTOFP_IRQ_P (fn_type); bool restore_blink = arc_must_save_return_addr (cfun) && !ARC_AUTOBLINK_IRQ_P (fn_type); uint64_t gmask = cfun->machine->frame_info.gmask; bool return_p = !sibcall_p && fn_type == ARC_FUNCTION_NORMAL && !cfun->machine->frame_info.pretend_size; struct arc_frame_info *frame = &cfun->machine->frame_info; /* Naked functions don't have epilogue. */ if (ARC_NAKED_P (fn_type)) return; size = arc_compute_frame_size (); size_to_deallocate = size; first_offset = size - (frame->pretend_size + frame->reg_size + frame->extra_size); if (!can_trust_sp_p) gcc_assert (arc_frame_pointer_needed ()); /* Emit a blockage to avoid/flush all pending sp operations. */ if (size) emit_insn (gen_blockage ()); if (ARC_INTERRUPT_P (fn_type) && restore_fp) { /* We need to restore FP before any SP operation in an interrupt. */ size_to_deallocate -= arc_restore_callee_saves (0, false, restore_fp, first_offset, size_to_deallocate); restore_fp = false; first_offset = 0; } /* Restore ARC600' MUL64 registers. */ if (arc_must_save_register (R58_REG, cfun, true)) { rtx insn; rtx reg0 = gen_rtx_REG (SImode, R0_REG); rtx reg1 = gen_rtx_REG (SImode, R1_REG); size_to_deallocate -= pop_reg (reg0); size_to_deallocate -= pop_reg (reg1); insn = emit_insn (gen_mulu64 (reg0, const1_rtx)); add_reg_note (insn, REG_CFA_RESTORE, gen_rtx_REG (SImode, R58_REG)); RTX_FRAME_RELATED_P (insn) = 1; emit_insn (gen_arc600_stall ()); insn = emit_insn (gen_rtx_UNSPEC_VOLATILE (VOIDmode, gen_rtvec (2, reg1, GEN_INT (AUX_MULHI)), VUNSPEC_ARC_SR)); add_reg_note (insn, REG_CFA_RESTORE, gen_rtx_REG (SImode, R59_REG)); RTX_FRAME_RELATED_P (insn) = 1; } /* Restore AUX-regs used by FPX machinery. */ if (arc_must_save_register (TARGET_BIG_ENDIAN ? R41_REG : R40_REG, cfun, TARGET_DPFP)) { rtx reg0 = gen_rtx_REG (SImode, R0_REG); int i; for (i = 0; i < 4; i++) { size_to_deallocate -= pop_reg (reg0); emit_insn (gen_rtx_UNSPEC_VOLATILE (VOIDmode, gen_rtvec (2, reg0, GEN_INT (AUX_DPFP_START + i)), VUNSPEC_ARC_SR)); } } /* Check if we need to restore the ZOL machinery. */ if (arc_lpcwidth !=0 && arc_must_save_register (LP_COUNT, cfun, true)) { rtx reg0 = gen_rtx_REG (SImode, R0_REG); size_to_deallocate -= pop_reg (reg0); emit_move_insn (gen_rtx_REG (SImode, LP_COUNT), reg0); size_to_deallocate -= pop_reg (reg0); emit_insn (gen_rtx_UNSPEC_VOLATILE (VOIDmode, gen_rtvec (2, reg0, GEN_INT (AUX_LP_END)), VUNSPEC_ARC_SR)); size_to_deallocate -= pop_reg (reg0); emit_insn (gen_rtx_UNSPEC_VOLATILE (VOIDmode, gen_rtvec (2, reg0, GEN_INT (AUX_LP_START)), VUNSPEC_ARC_SR)); } if (TARGET_CODE_DENSITY && TARGET_CODE_DENSITY_FRAME && !ARC_AUTOFP_IRQ_P (fn_type) && !ARC_AUTOBLINK_IRQ_P (fn_type) && !ARC_INTERRUPT_P (fn_type) && arc_enter_leave_p (gmask)) { /* Using leave instruction. */ size_to_deallocate -= arc_restore_callee_leave (gmask, restore_blink, restore_fp, return_p, first_offset); if (return_p) { gcc_assert (size_to_deallocate == 0); return; } } else if (frame->millicode_end_reg > 14) { /* Using millicode calls. */ size_to_deallocate -= arc_restore_callee_milli (gmask, restore_blink, restore_fp, return_p, first_offset); if (return_p) { gcc_assert (size_to_deallocate == 0); return; } } else size_to_deallocate -= arc_restore_callee_saves (gmask, restore_blink, restore_fp, first_offset, size_to_deallocate); /* Keep track of how much of the stack pointer we've restored. It makes the following a lot more readable. */ restored = size - size_to_deallocate; if (size > restored) frame_stack_add (size - restored); /* For frames that use __builtin_eh_return, the register defined by EH_RETURN_STACKADJ_RTX is set to 0 for all standard return paths. On eh_return paths however, the register is set to the value that should be added to the stack pointer in order to restore the correct stack pointer for the exception handling frame. For ARC we are going to use r2 for EH_RETURN_STACKADJ_RTX, add this onto the stack for eh_return frames. */ if (crtl->calls_eh_return) emit_insn (gen_add2_insn (stack_pointer_rtx, EH_RETURN_STACKADJ_RTX)); /* Emit the return instruction. */ if (ARC_INTERRUPT_P (fn_type)) { rtx ra = gen_rtx_REG (Pmode, arc_return_address_register (fn_type)); if (TARGET_V2) emit_jump_insn (gen_rtie ()); else if (TARGET_ARC700) emit_jump_insn (gen_rtie ()); else emit_jump_insn (gen_arc600_rtie (ra)); } else if (sibcall_p == FALSE) emit_jump_insn (gen_simple_return ()); } /* Helper for {push/pop}_multi_operand: check if rtx OP is a suitable construct to match either enter or leave instruction. Which one which is selected by PUSH_P argument. */ bool arc_check_multi (rtx op, bool push_p) { HOST_WIDE_INT len = XVECLEN (op, 0); unsigned int regno, i, start; unsigned int memp = push_p ? 0 : 1; rtx elt; if (len <= 1) return false; start = 1; elt = XVECEXP (op, 0, 0); if (!push_p && GET_CODE (elt) == RETURN) start = 2; for (i = start, regno = ENTER_LEAVE_START_REG; i < len; i++, regno++) { rtx elt = XVECEXP (op, 0, i); rtx reg, mem, addr; if (GET_CODE (elt) != SET) return false; mem = XEXP (elt, memp); reg = XEXP (elt, 1 - memp); if (!REG_P (reg) || !MEM_P (mem)) return false; /* Check for blink. */ if (REGNO (reg) == RETURN_ADDR_REGNUM && i == start) regno = 12; else if (REGNO (reg) == HARD_FRAME_POINTER_REGNUM) ++i; else if (REGNO (reg) != regno) return false; addr = XEXP (mem, 0); if (GET_CODE (addr) == PLUS) { if (!rtx_equal_p (stack_pointer_rtx, XEXP (addr, 0)) || !CONST_INT_P (XEXP (addr, 1))) return false; } else { if (!rtx_equal_p (stack_pointer_rtx, addr)) return false; } } return true; } /* Return rtx for the location of the return address on the stack, suitable for use in __builtin_eh_return. The new return address will be written to this location in order to redirect the return to the exception handler. Our ABI says the blink is pushed first on stack followed by an unknown number of register saves, and finally by fp. Hence we cannot use the EH_RETURN_ADDRESS macro as the stack is not finalized. */ void arc_eh_return_address_location (rtx source) { rtx mem; int offset; struct arc_frame_info *afi; arc_compute_frame_size (); afi = &cfun->machine->frame_info; gcc_assert (crtl->calls_eh_return); gcc_assert (afi->save_return_addr); gcc_assert (afi->extra_size >= 4); /* The '-4' removes the size of the return address, which is included in the 'extra_size' field. */ offset = afi->reg_size + afi->extra_size - 4; mem = gen_frame_mem (Pmode, plus_constant (Pmode, hard_frame_pointer_rtx, offset)); /* The following should not be needed, and is, really a hack. The issue being worked around here is that the DSE (Dead Store Elimination) pass will remove this write to the stack as it sees a single store and no corresponding read. The read however occurs in the epilogue code, which is not added into the function rtl until a later pass. So, at the time of DSE, the decision to remove this store seems perfectly sensible. Marking the memory address as volatile obviously has the effect of preventing DSE from removing the store. */ MEM_VOLATILE_P (mem) = true; emit_move_insn (mem, source); } /* PIC */ /* Helper to generate unspec constant. */ static rtx arc_unspec_offset (rtx loc, int unspec) { return gen_rtx_CONST (Pmode, gen_rtx_UNSPEC (Pmode, gen_rtvec (1, loc), unspec)); } /* !TARGET_BARREL_SHIFTER support. */ /* Emit a shift insn to set OP0 to OP1 shifted by OP2; CODE specifies what kind of shift. */ void emit_shift (enum rtx_code code, rtx op0, rtx op1, rtx op2) { rtx shift = gen_rtx_fmt_ee (code, SImode, op1, op2); rtx pat = ((shift4_operator (shift, SImode) ? gen_shift_si3 : gen_shift_si3_loop) (op0, op1, op2, shift)); emit_insn (pat); } /* Output the assembler code for doing a shift. We go to a bit of trouble to generate efficient code as the ARC601 only has single bit shifts. This is taken from the h8300 port. We only have one mode of shifting and can't access individual bytes like the h8300 can, so this is greatly simplified (at the expense of not generating hyper- efficient code). This function is not used if the variable shift insns are present. */ /* FIXME: This probably can be done using a define_split in arc.md. Alternately, generate rtx rather than output instructions. */ const char * output_shift (rtx *operands) { /* static int loopend_lab;*/ rtx shift = operands[3]; machine_mode mode = GET_MODE (shift); enum rtx_code code = GET_CODE (shift); const char *shift_one; gcc_assert (mode == SImode); switch (code) { case ASHIFT: shift_one = "add %0,%1,%1"; break; case ASHIFTRT: shift_one = "asr %0,%1"; break; case LSHIFTRT: shift_one = "lsr %0,%1"; break; default: gcc_unreachable (); } if (GET_CODE (operands[2]) != CONST_INT) { output_asm_insn ("and.f lp_count,%2, 0x1f", operands); goto shiftloop; } else { int n; n = INTVAL (operands[2]); /* Only consider the lower 5 bits of the shift count. */ n = n & 0x1f; /* First see if we can do them inline. */ /* ??? We could get better scheduling & shorter code (using short insns) by using splitters. Alas, that'd be even more verbose. */ if (code == ASHIFT && n <= 9 && n > 2 && dest_reg_operand (operands[4], SImode)) { output_asm_insn ("mov %4,0\n\tadd3 %0,%4,%1", operands); for (n -=3 ; n >= 3; n -= 3) output_asm_insn ("add3 %0,%4,%0", operands); if (n == 2) output_asm_insn ("add2 %0,%4,%0", operands); else if (n) output_asm_insn ("add %0,%0,%0", operands); } else if (n <= 4) { while (--n >= 0) { output_asm_insn (shift_one, operands); operands[1] = operands[0]; } } /* See if we can use a rotate/and. */ else if (n == BITS_PER_WORD - 1) { switch (code) { case ASHIFT : output_asm_insn ("and %0,%1,1\n\tror %0,%0", operands); break; case ASHIFTRT : /* The ARC doesn't have a rol insn. Use something else. */ output_asm_insn ("add.f 0,%1,%1\n\tsbc %0,%0,%0", operands); break; case LSHIFTRT : /* The ARC doesn't have a rol insn. Use something else. */ output_asm_insn ("add.f 0,%1,%1\n\trlc %0,0", operands); break; default: break; } } else if (n == BITS_PER_WORD - 2 && dest_reg_operand (operands[4], SImode)) { switch (code) { case ASHIFT : output_asm_insn ("and %0,%1,3\n\tror %0,%0\n\tror %0,%0", operands); break; case ASHIFTRT : #if 1 /* Need some scheduling comparisons. */ output_asm_insn ("add.f %4,%1,%1\n\tsbc %0,%0,%0\n\t" "add.f 0,%4,%4\n\trlc %0,%0", operands); #else output_asm_insn ("add.f %4,%1,%1\n\tbxor %0,%4,31\n\t" "sbc.f %0,%0,%4\n\trlc %0,%0", operands); #endif break; case LSHIFTRT : #if 1 output_asm_insn ("add.f %4,%1,%1\n\trlc %0,0\n\t" "add.f 0,%4,%4\n\trlc %0,%0", operands); #else output_asm_insn ("add.f %0,%1,%1\n\trlc.f %0,0\n\t" "and %0,%0,1\n\trlc %0,%0", operands); #endif break; default: break; } } else if (n == BITS_PER_WORD - 3 && code == ASHIFT) output_asm_insn ("and %0,%1,7\n\tror %0,%0\n\tror %0,%0\n\tror %0,%0", operands); /* Must loop. */ else { operands[2] = GEN_INT (n); output_asm_insn ("mov.f lp_count, %2", operands); shiftloop: { output_asm_insn ("lpnz\t2f", operands); output_asm_insn (shift_one, operands); output_asm_insn ("nop", operands); fprintf (asm_out_file, "2:\t%s end single insn loop\n", ASM_COMMENT_START); } } } return ""; } /* Nested function support. */ /* Output assembler code for a block containing the constant parts of a trampoline, leaving space for variable parts. A trampoline looks like this: ld_s r12,[pcl,8] ld r11,[pcl,12] j_s [r12] .word function's address .word static chain value */ static void arc_asm_trampoline_template (FILE *f) { asm_fprintf (f, "\tld_s\t%s,[pcl,8]\n", ARC_TEMP_SCRATCH_REG); asm_fprintf (f, "\tld\t%s,[pcl,12]\n", reg_names[STATIC_CHAIN_REGNUM]); asm_fprintf (f, "\tj_s\t[%s]\n", ARC_TEMP_SCRATCH_REG); assemble_aligned_integer (UNITS_PER_WORD, const0_rtx); assemble_aligned_integer (UNITS_PER_WORD, const0_rtx); } /* Emit RTL insns to initialize the variable parts of a trampoline. FNADDR is an RTX for the address of the function's pure code. CXT is an RTX for the static chain value for the function. The fastest trampoline to execute for trampolines within +-8KB of CTX would be: add2 r11,pcl,s12 j [limm] 0x20200f80 limm and that would also be faster to write to the stack by computing the offset from CTX to TRAMP at compile time. However, it would really be better to get rid of the high cost of cache invalidation when generating trampolines, which requires that the code part of trampolines stays constant, and additionally either making sure that no executable code but trampolines is on the stack, no icache entries linger for the area of the stack from when before the stack was allocated, and allocating trampolines in trampoline-only cache lines or allocate trampolines fram a special pool of pre-allocated trampolines. */ static void arc_initialize_trampoline (rtx tramp, tree fndecl, rtx cxt) { rtx fnaddr = XEXP (DECL_RTL (fndecl), 0); emit_block_move (tramp, assemble_trampoline_template (), GEN_INT (TRAMPOLINE_SIZE), BLOCK_OP_NORMAL); emit_move_insn (adjust_address (tramp, SImode, 8), fnaddr); emit_move_insn (adjust_address (tramp, SImode, 12), cxt); emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"), LCT_NORMAL, VOIDmode, XEXP (tramp, 0), Pmode, plus_constant (Pmode, XEXP (tramp, 0), TRAMPOLINE_SIZE), Pmode); } /* Add the given function declaration to emit code in JLI section. */ static void arc_add_jli_section (rtx pat) { const char *name; tree attrs; arc_jli_section *sec = arc_jli_sections, *new_section; tree decl = SYMBOL_REF_DECL (pat); if (!pat) return; if (decl) { /* For fixed locations do not generate the jli table entry. It should be provided by the user as an asm file. */ attrs = TYPE_ATTRIBUTES (TREE_TYPE (decl)); if (lookup_attribute ("jli_fixed", attrs)) return; } name = XSTR (pat, 0); /* Don't insert the same symbol twice. */ while (sec != NULL) { if(strcmp (name, sec->name) == 0) return; sec = sec->next; } /* New name, insert it. */ new_section = (arc_jli_section *) xmalloc (sizeof (arc_jli_section)); gcc_assert (new_section != NULL); new_section->name = name; new_section->next = arc_jli_sections; arc_jli_sections = new_section; } /* This is set briefly to 1 when we output a ".as" address modifer, and then reset when we output the scaled address. */ static int output_scaled = 0; /* Set when we force sdata output. */ static int output_sdata = 0; /* Print operand X (an rtx) in assembler syntax to file FILE. CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified. For `%' followed by punctuation, CODE is the punctuation and X is null. */ /* In final.c:output_asm_insn: 'l' : label 'a' : address 'c' : constant address if CONSTANT_ADDRESS_P 'n' : negative Here: 'Z': log2(x+1)-1 'z': log2 'M': log2(~x) 'p': bit Position of lsb 's': size of bit field '#': condbranch delay slot suffix '*': jump delay slot suffix '?' : nonjump-insn suffix for conditional execution or short instruction '!' : jump / call suffix for conditional execution or short instruction '`': fold constant inside unary o-perator, re-recognize, and emit. 'd' 'D' 'R': Second word 'S': JLI instruction 'j': used by mov instruction to properly emit jli related labels. 'B': Branch comparison operand - suppress sda reference 'H': Most significant word 'L': Least significant word 'A': ASCII decimal representation of floating point value 'U': Load/store update or scaling indicator 'V': cache bypass indicator for volatile 'P' 'F' '^' 'O': Operator 'o': original symbol - no @ prepending. */ void arc_print_operand (FILE *file, rtx x, int code) { switch (code) { case 'Z': if (GET_CODE (x) == CONST_INT) fprintf (file, "%d",exact_log2(INTVAL (x) + 1) - 1 ); else output_operand_lossage ("invalid operand to %%Z code"); return; case 'z': if (GET_CODE (x) == CONST_INT) fprintf (file, "%d",exact_log2 (INTVAL (x) & 0xffffffff)); else output_operand_lossage ("invalid operand to %%z code"); return; case 'c': if (GET_CODE (x) == CONST_INT) fprintf (file, HOST_WIDE_INT_PRINT_DEC, INTVAL (x) ); else output_operand_lossage ("invalid operands to %%c code"); return; case 'M': if (GET_CODE (x) == CONST_INT) fprintf (file, "%d",exact_log2(~INTVAL (x)) ); else output_operand_lossage ("invalid operand to %%M code"); return; case 'p': if (GET_CODE (x) == CONST_INT) fprintf (file, "%d", exact_log2 (INTVAL (x) & -INTVAL (x))); else output_operand_lossage ("invalid operand to %%p code"); return; case 's': if (GET_CODE (x) == CONST_INT) { HOST_WIDE_INT i = INTVAL (x); HOST_WIDE_INT s = exact_log2 (i & -i); fprintf (file, "%d", exact_log2 (((0xffffffffUL & i) >> s) + 1)); } else output_operand_lossage ("invalid operand to %%s code"); return; case '#' : /* Conditional branches depending on condition codes. Note that this is only for branches that were known to depend on condition codes before delay slot scheduling; out-of-range brcc / bbit expansions should use '*'. This distinction is important because of the different allowable delay slot insns and the output of the delay suffix for TARGET_AT_DBR_COND_EXEC. */ case '*' : /* Unconditional branches / branches not depending on condition codes. This could also be a CALL_INSN. Output the appropriate delay slot suffix. */ if (final_sequence && final_sequence->len () != 1) { rtx_insn *jump = final_sequence->insn (0); rtx_insn *delay = final_sequence->insn (1); /* For TARGET_PAD_RETURN we might have grabbed the delay insn. */ if (delay->deleted ()) return; if (JUMP_P (jump) && INSN_ANNULLED_BRANCH_P (jump)) fputs (INSN_FROM_TARGET_P (delay) ? ".d" : TARGET_AT_DBR_CONDEXEC && code == '#' ? ".d" : get_attr_type (jump) == TYPE_RETURN && code == '#' ? "" : ".nd", file); else fputs (".d", file); } return; case '?' : /* with leading "." */ case '!' : /* without leading "." */ /* This insn can be conditionally executed. See if the ccfsm machinery says it should be conditionalized. If it shouldn't, we'll check the compact attribute if this insn has a short variant, which may be used depending on code size and alignment considerations. */ if (current_insn_predicate) arc_ccfsm_current.cc = get_arc_condition_code (current_insn_predicate); if (ARC_CCFSM_COND_EXEC_P (&arc_ccfsm_current)) { /* Is this insn in a delay slot sequence? */ if (!final_sequence || XVECLEN (final_sequence, 0) < 2 || current_insn_predicate || CALL_P (final_sequence->insn (0)) || simplejump_p (final_sequence->insn (0))) { /* This insn isn't in a delay slot sequence, or conditionalized independently of its position in a delay slot. */ fprintf (file, "%s%s", code == '?' ? "." : "", arc_condition_codes[arc_ccfsm_current.cc]); /* If this is a jump, there are still short variants. However, only beq_s / bne_s have the same offset range as b_s, and the only short conditional returns are jeq_s and jne_s. */ if (code == '!' && (arc_ccfsm_current.cc == ARC_CC_EQ || arc_ccfsm_current.cc == ARC_CC_NE || 0 /* FIXME: check if branch in 7 bit range. */)) output_short_suffix (file); } else if (code == '!') /* Jump with delay slot. */ fputs (arc_condition_codes[arc_ccfsm_current.cc], file); else /* An Instruction in a delay slot of a jump or call. */ { rtx jump = XVECEXP (final_sequence, 0, 0); rtx insn = XVECEXP (final_sequence, 0, 1); /* If the insn is annulled and is from the target path, we need to inverse the condition test. */ if (JUMP_P (jump) && INSN_ANNULLED_BRANCH_P (jump)) { if (INSN_FROM_TARGET_P (insn)) fprintf (file, "%s%s", code == '?' ? "." : "", arc_condition_codes[ARC_INVERSE_CONDITION_CODE (arc_ccfsm_current.cc)]); else fprintf (file, "%s%s", code == '?' ? "." : "", arc_condition_codes[arc_ccfsm_current.cc]); if (arc_ccfsm_current.state == 5) arc_ccfsm_current.state = 0; } else /* This insn is executed for either path, so don't conditionalize it at all. */ output_short_suffix (file); } } else output_short_suffix (file); return; case'`': /* FIXME: fold constant inside unary operator, re-recognize, and emit. */ gcc_unreachable (); case 'd' : fputs (arc_condition_codes[get_arc_condition_code (x)], file); return; case 'D' : fputs (arc_condition_codes[ARC_INVERSE_CONDITION_CODE (get_arc_condition_code (x))], file); return; case 'R' : /* Write second word of DImode or DFmode reference, register or memory. */ if (GET_CODE (x) == REG) fputs (reg_names[REGNO (x)+1], file); else if (GET_CODE (x) == MEM) { fputc ('[', file); /* Handle possible auto-increment. For PRE_INC / PRE_DEC / PRE_MODIFY, we will have handled the first word already; For POST_INC / POST_DEC / POST_MODIFY, the access to the first word will be done later. In either case, the access to the first word will do the modify, and we only have to add an offset of four here. */ if (GET_CODE (XEXP (x, 0)) == PRE_INC || GET_CODE (XEXP (x, 0)) == PRE_DEC || GET_CODE (XEXP (x, 0)) == PRE_MODIFY || GET_CODE (XEXP (x, 0)) == POST_INC || GET_CODE (XEXP (x, 0)) == POST_DEC || GET_CODE (XEXP (x, 0)) == POST_MODIFY) output_address (VOIDmode, plus_constant (Pmode, XEXP (XEXP (x, 0), 0), 4)); else if (output_scaled) { rtx addr = XEXP (x, 0); int size = GET_MODE_SIZE (GET_MODE (x)); output_address (VOIDmode, plus_constant (Pmode, XEXP (addr, 0), ((INTVAL (XEXP (addr, 1)) + 4) >> (size == 2 ? 1 : 2)))); output_scaled = 0; } else output_address (VOIDmode, plus_constant (Pmode, XEXP (x, 0), 4)); fputc (']', file); } else output_operand_lossage ("invalid operand to %%R code"); return; case 'j': case 'S' : if (GET_CODE (x) == SYMBOL_REF && arc_is_jli_call_p (x)) { if (SYMBOL_REF_DECL (x)) { tree attrs = (TREE_TYPE (SYMBOL_REF_DECL (x)) != error_mark_node ? TYPE_ATTRIBUTES (TREE_TYPE (SYMBOL_REF_DECL (x))) : NULL_TREE); if (lookup_attribute ("jli_fixed", attrs)) { /* No special treatment for jli_fixed functions. */ if (code == 'j') break; fprintf (file, HOST_WIDE_INT_PRINT_DEC "\t; @", TREE_INT_CST_LOW (TREE_VALUE (TREE_VALUE (attrs)))); assemble_name (file, XSTR (x, 0)); return; } } fprintf (file, "@__jli."); assemble_name (file, XSTR (x, 0)); if (code == 'j') arc_add_jli_section (x); return; } if (GET_CODE (x) == SYMBOL_REF && arc_is_secure_call_p (x)) { /* No special treatment for secure functions. */ if (code == 'j' ) break; tree attrs = (TREE_TYPE (SYMBOL_REF_DECL (x)) != error_mark_node ? TYPE_ATTRIBUTES (TREE_TYPE (SYMBOL_REF_DECL (x))) : NULL_TREE); fprintf (file, HOST_WIDE_INT_PRINT_DEC "\t; @", TREE_INT_CST_LOW (TREE_VALUE (TREE_VALUE (attrs)))); assemble_name (file, XSTR (x, 0)); return; } break; case 'B' /* Branch or other LIMM ref - must not use sda references. */ : if (CONSTANT_P (x)) { output_addr_const (file, x); return; } break; case 'H' : case 'L' : if (GET_CODE (x) == REG) { /* L = least significant word, H = most significant word. */ if ((WORDS_BIG_ENDIAN != 0) ^ (code == 'L')) fputs (reg_names[REGNO (x)], file); else fputs (reg_names[REGNO (x)+1], file); } else if (GET_CODE (x) == CONST_INT || GET_CODE (x) == CONST_DOUBLE) { rtx first, second, word; split_double (x, &first, &second); if((WORDS_BIG_ENDIAN) == 0) word = (code == 'L' ? first : second); else word = (code == 'L' ? second : first); fprintf (file, "0x%08" PRIx32, ((uint32_t) INTVAL (word))); } else output_operand_lossage ("invalid operand to %%H/%%L code"); return; case 'A' : { char str[30]; gcc_assert (GET_CODE (x) == CONST_DOUBLE && GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT); real_to_decimal (str, CONST_DOUBLE_REAL_VALUE (x), sizeof (str), 0, 1); fprintf (file, "%s", str); return; } case 'U' : /* Output a load/store with update indicator if appropriate. */ if (GET_CODE (x) == MEM) { rtx addr = XEXP (x, 0); switch (GET_CODE (addr)) { case PRE_INC: case PRE_DEC: case PRE_MODIFY: fputs (".a", file); break; case POST_INC: case POST_DEC: case POST_MODIFY: fputs (".ab", file); break; case PLUS: /* Are we using a scaled index? */ if (GET_CODE (XEXP (addr, 0)) == MULT) fputs (".as", file); /* Can we use a scaled offset? */ else if (CONST_INT_P (XEXP (addr, 1)) && GET_MODE_SIZE (GET_MODE (x)) > 1 && (!(INTVAL (XEXP (addr, 1)) & (GET_MODE_SIZE (GET_MODE (x)) - 1) & 3)) /* Does it make a difference? */ && !SMALL_INT_RANGE(INTVAL (XEXP (addr, 1)), GET_MODE_SIZE (GET_MODE (x)) - 2, 0)) { fputs (".as", file); output_scaled = 1; } break; case SYMBOL_REF: case CONST: if (legitimate_small_data_address_p (addr, GET_MODE (x)) && GET_MODE_SIZE (GET_MODE (x)) > 1) { int align = get_symbol_alignment (addr); int mask = 0; switch (GET_MODE (x)) { case E_HImode: mask = 1; break; default: mask = 3; break; } if (align && ((align & mask) == 0)) fputs (".as", file); } break; case REG: break; default: gcc_assert (CONSTANT_P (addr)); break; } } else output_operand_lossage ("invalid operand to %%U code"); return; case 'V' : /* Output cache bypass indicator for a load/store insn. Volatile memory refs are defined to use the cache bypass mechanism. */ if (GET_CODE (x) == MEM) { if ((MEM_VOLATILE_P (x) && !TARGET_VOLATILE_CACHE_SET) || arc_is_uncached_mem_p (x)) fputs (".di", file); } else output_operand_lossage ("invalid operand to %%V code"); return; /* plt code. */ case 'P': case 0 : /* Do nothing special. */ break; case 'F': fputs (reg_names[REGNO (x)]+1, file); return; case '^': /* This punctuation character is needed because label references are printed in the output template using %l. This is a front end character, and when we want to emit a '@' before it, we have to use this '^'. */ fputc('@',file); return; case 'O': /* Output an operator. */ switch (GET_CODE (x)) { case PLUS: fputs ("add", file); return; case SS_PLUS: fputs ("adds", file); return; case AND: fputs ("and", file); return; case IOR: fputs ("or", file); return; case XOR: fputs ("xor", file); return; case MINUS: fputs ("sub", file); return; case SS_MINUS: fputs ("subs", file); return; case ASHIFT: fputs ("asl", file); return; case ASHIFTRT: fputs ("asr", file); return; case LSHIFTRT: fputs ("lsr", file); return; case ROTATERT: fputs ("ror", file); return; case MULT: fputs ("mpy", file); return; case ABS: fputs ("abs", file); return; /* Unconditional. */ case NEG: fputs ("neg", file); return; case SS_NEG: fputs ("negs", file); return; case NOT: fputs ("not", file); return; /* Unconditional. */ case ZERO_EXTEND: fputs ("ext", file); /* bmsk allows predication. */ goto size_suffix; case SIGN_EXTEND: /* Unconditional. */ fputs ("sex", file); size_suffix: switch (GET_MODE (XEXP (x, 0))) { case E_QImode: fputs ("b", file); return; case E_HImode: fputs ("w", file); return; default: break; } break; case SS_TRUNCATE: if (GET_MODE (x) != HImode) break; fputs ("sat16", file); default: break; } output_operand_lossage ("invalid operand to %%O code"); return; case 'o': if (GET_CODE (x) == SYMBOL_REF) { assemble_name (file, XSTR (x, 0)); return; } break; case '&': if (TARGET_ANNOTATE_ALIGN) fprintf (file, "; unalign: %d", cfun->machine->unalign); return; case '+': if (TARGET_V2) fputs ("m", file); else fputs ("h", file); return; case '_': if (TARGET_V2) fputs ("h", file); else fputs ("w", file); return; default : /* Unknown flag. */ output_operand_lossage ("invalid operand output code"); } switch (GET_CODE (x)) { case REG : fputs (reg_names[REGNO (x)], file); break; case MEM : { rtx addr = XEXP (x, 0); int size = GET_MODE_SIZE (GET_MODE (x)); if (legitimate_small_data_address_p (addr, GET_MODE (x))) output_sdata = 1; fputc ('[', file); switch (GET_CODE (addr)) { case PRE_INC: case POST_INC: output_address (VOIDmode, plus_constant (Pmode, XEXP (addr, 0), size)); break; case PRE_DEC: case POST_DEC: output_address (VOIDmode, plus_constant (Pmode, XEXP (addr, 0), -size)); break; case PRE_MODIFY: case POST_MODIFY: output_address (VOIDmode, XEXP (addr, 1)); break; case PLUS: if (output_scaled) { output_address (VOIDmode, plus_constant (Pmode, XEXP (addr, 0), (INTVAL (XEXP (addr, 1)) >> (size == 2 ? 1 : 2)))); output_scaled = 0; } else output_address (VOIDmode, addr); break; default: if (flag_pic && CONSTANT_ADDRESS_P (addr)) arc_output_pic_addr_const (file, addr, code); else output_address (VOIDmode, addr); break; } fputc (']', file); break; } case CONST_DOUBLE : /* We handle SFmode constants here as output_addr_const doesn't. */ if (GET_MODE (x) == SFmode) { long l; REAL_VALUE_TO_TARGET_SINGLE (*CONST_DOUBLE_REAL_VALUE (x), l); fprintf (file, "0x%08lx", l); break; } /* FALLTHRU */ /* Let output_addr_const deal with it. */ default : if (flag_pic || (GET_CODE (x) == CONST && GET_CODE (XEXP (x, 0)) == UNSPEC && (XINT (XEXP (x, 0), 1) == UNSPEC_TLS_OFF || XINT (XEXP (x, 0), 1) == UNSPEC_TLS_GD)) || (GET_CODE (x) == CONST && GET_CODE (XEXP (x, 0)) == PLUS && GET_CODE (XEXP (XEXP (x, 0), 0)) == UNSPEC && (XINT (XEXP (XEXP (x, 0), 0), 1) == UNSPEC_TLS_OFF || XINT (XEXP (XEXP (x, 0), 0), 1) == UNSPEC_TLS_GD))) arc_output_pic_addr_const (file, x, code); else output_addr_const (file, x); break; } } /* Print a memory address as an operand to reference that memory location. */ void arc_print_operand_address (FILE *file , rtx addr) { register rtx base, index = 0; switch (GET_CODE (addr)) { case REG : fputs (reg_names[REGNO (addr)], file); break; case SYMBOL_REF: if (output_sdata) fputs ("gp,", file); output_addr_const (file, addr); if (output_sdata) fputs ("@sda", file); output_sdata = 0; break; case PLUS : if (GET_CODE (XEXP (addr, 0)) == MULT) index = XEXP (XEXP (addr, 0), 0), base = XEXP (addr, 1); else if (CONST_INT_P (XEXP (addr, 0))) index = XEXP (addr, 0), base = XEXP (addr, 1); else base = XEXP (addr, 0), index = XEXP (addr, 1); gcc_assert (OBJECT_P (base)); arc_print_operand_address (file, base); if (CONSTANT_P (base) && CONST_INT_P (index)) fputc ('+', file); else fputc (',', file); gcc_assert (OBJECT_P (index)); arc_print_operand_address (file, index); break; case CONST: { rtx c = XEXP (addr, 0); if ((GET_CODE (c) == UNSPEC && (XINT (c, 1) == UNSPEC_TLS_OFF || XINT (c, 1) == UNSPEC_TLS_IE)) || (GET_CODE (c) == PLUS && GET_CODE (XEXP (c, 0)) == UNSPEC && (XINT (XEXP (c, 0), 1) == UNSPEC_TLS_OFF || XINT (XEXP (c, 0), 1) == ARC_UNSPEC_GOTOFFPC))) { arc_output_pic_addr_const (file, c, 0); break; } gcc_assert (GET_CODE (c) == PLUS); gcc_assert (GET_CODE (XEXP (c, 0)) == SYMBOL_REF); gcc_assert (GET_CODE (XEXP (c, 1)) == CONST_INT); output_address (VOIDmode, XEXP (addr, 0)); break; } case PRE_INC : case PRE_DEC : /* We shouldn't get here as we've lost the mode of the memory object (which says how much to inc/dec by. */ gcc_unreachable (); break; default : if (flag_pic) arc_output_pic_addr_const (file, addr, 0); else output_addr_const (file, addr); break; } } /* Conditional execution support. This is based on the ARM port but for now is much simpler. A finite state machine takes care of noticing whether or not instructions can be conditionally executed, and thus decrease execution time and code size by deleting branch instructions. The fsm is controlled by arc_ccfsm_advance (called by arc_final_prescan_insn), and controls the actions of PRINT_OPERAND. The patterns in the .md file for the branch insns also have a hand in this. */ /* The way we leave dealing with non-anulled or annull-false delay slot insns to the consumer is awkward. */ /* The state of the fsm controlling condition codes are: 0: normal, do nothing special 1: don't output this insn 2: don't output this insn 3: make insns conditional 4: make insns conditional 5: make insn conditional (only for outputting anulled delay slot insns) special value for cfun->machine->uid_ccfsm_state: 6: return with but one insn before it since function start / call State transitions (state->state by whom, under what condition): 0 -> 1 arc_ccfsm_advance, if insn is a conditional branch skipping over some instructions. 0 -> 2 arc_ccfsm_advance, if insn is a conditional branch followed by zero or more non-jump insns and an unconditional branch with the same target label as the condbranch. 1 -> 3 branch patterns, after having not output the conditional branch 2 -> 4 branch patterns, after having not output the conditional branch 0 -> 5 branch patterns, for anulled delay slot insn. 3 -> 0 ASM_OUTPUT_INTERNAL_LABEL, if the `target' label is reached (the target label has CODE_LABEL_NUMBER equal to arc_ccfsm_target_label). 4 -> 0 arc_ccfsm_advance, if `target' unconditional branch is reached 3 -> 1 arc_ccfsm_advance, finding an 'else' jump skipping over some insns. 5 -> 0 when outputting the delay slot insn If the jump clobbers the conditions then we use states 2 and 4. A similar thing can be done with conditional return insns. We also handle separating branches from sets of the condition code. This is done here because knowledge of the ccfsm state is required, we may not be outputting the branch. */ /* arc_final_prescan_insn calls arc_ccfsm_advance to adjust arc_ccfsm_current, before letting final output INSN. */ static void arc_ccfsm_advance (rtx_insn *insn, struct arc_ccfsm *state) { /* BODY will hold the body of INSN. */ register rtx body; /* This will be 1 if trying to repeat the trick (ie: do the `else' part of an if/then/else), and things need to be reversed. */ int reverse = 0; /* If we start with a return insn, we only succeed if we find another one. */ int seeking_return = 0; /* START_INSN will hold the insn from where we start looking. This is the first insn after the following code_label if REVERSE is true. */ rtx_insn *start_insn = insn; /* Type of the jump_insn. Brcc insns don't affect ccfsm changes, since they don't rely on a cmp preceding the. */ enum attr_type jump_insn_type; /* Allow -mdebug-ccfsm to turn this off so we can see how well it does. We can't do this in macro FINAL_PRESCAN_INSN because its called from final_scan_insn which has `optimize' as a local. */ if (optimize < 2 || TARGET_NO_COND_EXEC) return; /* Ignore notes and labels. */ if (!INSN_P (insn)) return; body = PATTERN (insn); /* If in state 4, check if the target branch is reached, in order to change back to state 0. */ if (state->state == 4) { if (insn == state->target_insn) { state->target_insn = NULL; state->state = 0; } return; } /* If in state 3, it is possible to repeat the trick, if this insn is an unconditional branch to a label, and immediately following this branch is the previous target label which is only used once, and the label this branch jumps to is not too far off. Or in other words "we've done the `then' part, see if we can do the `else' part." */ if (state->state == 3) { if (simplejump_p (insn)) { start_insn = next_nonnote_insn (start_insn); if (GET_CODE (start_insn) == BARRIER) { /* ??? Isn't this always a barrier? */ start_insn = next_nonnote_insn (start_insn); } if (GET_CODE (start_insn) == CODE_LABEL && CODE_LABEL_NUMBER (start_insn) == state->target_label && LABEL_NUSES (start_insn) == 1) reverse = TRUE; else return; } else if (GET_CODE (body) == SIMPLE_RETURN) { start_insn = next_nonnote_insn (start_insn); if (GET_CODE (start_insn) == BARRIER) start_insn = next_nonnote_insn (start_insn); if (GET_CODE (start_insn) == CODE_LABEL && CODE_LABEL_NUMBER (start_insn) == state->target_label && LABEL_NUSES (start_insn) == 1) { reverse = TRUE; seeking_return = 1; } else return; } else return; } if (GET_CODE (insn) != JUMP_INSN || GET_CODE (PATTERN (insn)) == ADDR_VEC || GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC) return; /* We can't predicate BRCC or loop ends. Also, when generating PIC code, and considering a medium range call, we can't predicate the call. */ jump_insn_type = get_attr_type (insn); if (jump_insn_type == TYPE_BRCC || jump_insn_type == TYPE_BRCC_NO_DELAY_SLOT || jump_insn_type == TYPE_LOOP_END || (jump_insn_type == TYPE_CALL && !get_attr_predicable (insn))) return; /* This jump might be paralleled with a clobber of the condition codes, the jump should always come first. */ if (GET_CODE (body) == PARALLEL && XVECLEN (body, 0) > 0) body = XVECEXP (body, 0, 0); if (reverse || (GET_CODE (body) == SET && GET_CODE (SET_DEST (body)) == PC && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE)) { int insns_skipped = 0, fail = FALSE, succeed = FALSE; /* Flag which part of the IF_THEN_ELSE is the LABEL_REF. */ int then_not_else = TRUE; /* Nonzero if next insn must be the target label. */ int next_must_be_target_label_p; rtx_insn *this_insn = start_insn; rtx label = 0; /* Register the insn jumped to. */ if (reverse) { if (!seeking_return) label = XEXP (SET_SRC (body), 0); } else if (GET_CODE (XEXP (SET_SRC (body), 1)) == LABEL_REF) label = XEXP (XEXP (SET_SRC (body), 1), 0); else if (GET_CODE (XEXP (SET_SRC (body), 2)) == LABEL_REF) { label = XEXP (XEXP (SET_SRC (body), 2), 0); then_not_else = FALSE; } else if (GET_CODE (XEXP (SET_SRC (body), 1)) == SIMPLE_RETURN) seeking_return = 1; else if (GET_CODE (XEXP (SET_SRC (body), 2)) == SIMPLE_RETURN) { seeking_return = 1; then_not_else = FALSE; } else gcc_unreachable (); /* If this is a non-annulled branch with a delay slot, there is no need to conditionalize the delay slot. */ if ((GET_CODE (PATTERN (NEXT_INSN (PREV_INSN (insn)))) == SEQUENCE) && state->state == 0 && !INSN_ANNULLED_BRANCH_P (insn)) { this_insn = NEXT_INSN (this_insn); } /* See how many insns this branch skips, and what kind of insns. If all insns are okay, and the label or unconditional branch to the same label is not too far away, succeed. */ for (insns_skipped = 0, next_must_be_target_label_p = FALSE; !fail && !succeed && insns_skipped < MAX_INSNS_SKIPPED; insns_skipped++) { rtx scanbody; this_insn = next_nonnote_insn (this_insn); if (!this_insn) break; if (next_must_be_target_label_p) { if (GET_CODE (this_insn) == BARRIER) continue; if (GET_CODE (this_insn) == CODE_LABEL && this_insn == label) { state->state = 1; succeed = TRUE; } else fail = TRUE; break; } switch (GET_CODE (this_insn)) { case CODE_LABEL: /* Succeed if it is the target label, otherwise fail since control falls in from somewhere else. */ if (this_insn == label) { state->state = 1; succeed = TRUE; } else fail = TRUE; break; case BARRIER: /* Succeed if the following insn is the target label. Otherwise fail. If return insns are used then the last insn in a function will be a barrier. */ next_must_be_target_label_p = TRUE; break; case CALL_INSN: /* Can handle a call insn if there are no insns after it. IE: The next "insn" is the target label. We don't have to worry about delay slots as such insns are SEQUENCE's inside INSN's. ??? It is possible to handle such insns though. */ if (get_attr_cond (this_insn) == COND_CANUSE) next_must_be_target_label_p = TRUE; else fail = TRUE; break; case JUMP_INSN: scanbody = PATTERN (this_insn); /* If this is an unconditional branch to the same label, succeed. If it is to another label, do nothing. If it is conditional, fail. */ /* ??? Probably, the test for the SET and the PC are unnecessary. */ if (GET_CODE (scanbody) == SET && GET_CODE (SET_DEST (scanbody)) == PC) { if (GET_CODE (SET_SRC (scanbody)) == LABEL_REF && XEXP (SET_SRC (scanbody), 0) == label && !reverse) { state->state = 2; succeed = TRUE; } else if (GET_CODE (SET_SRC (scanbody)) == IF_THEN_ELSE) fail = TRUE; else if (get_attr_cond (this_insn) != COND_CANUSE) fail = TRUE; } else if (GET_CODE (scanbody) == SIMPLE_RETURN && seeking_return) { state->state = 2; succeed = TRUE; } else if (GET_CODE (scanbody) == PARALLEL) { if (get_attr_cond (this_insn) != COND_CANUSE) fail = TRUE; } break; case INSN: scanbody = PATTERN (this_insn); /* We can only do this with insns that can use the condition codes (and don't set them). */ if (GET_CODE (scanbody) == SET || GET_CODE (scanbody) == PARALLEL) { if (get_attr_cond (this_insn) != COND_CANUSE) fail = TRUE; } /* We can't handle other insns like sequences. */ else fail = TRUE; break; default: break; } } if (succeed) { if ((!seeking_return) && (state->state == 1 || reverse)) state->target_label = CODE_LABEL_NUMBER (label); else if (seeking_return || state->state == 2) { while (this_insn && GET_CODE (PATTERN (this_insn)) == USE) { this_insn = next_nonnote_insn (this_insn); gcc_assert (!this_insn || (GET_CODE (this_insn) != BARRIER && GET_CODE (this_insn) != CODE_LABEL)); } if (!this_insn) { /* Oh dear! we ran off the end, give up. */ extract_insn_cached (insn); state->state = 0; state->target_insn = NULL; return; } state->target_insn = this_insn; } else gcc_unreachable (); /* If REVERSE is true, ARM_CURRENT_CC needs to be inverted from what it was. */ if (!reverse) { state->cond = XEXP (SET_SRC (body), 0); state->cc = get_arc_condition_code (XEXP (SET_SRC (body), 0)); } if (reverse || then_not_else) state->cc = ARC_INVERSE_CONDITION_CODE (state->cc); } /* Restore recog_operand. Getting the attributes of other insns can destroy this array, but final.c assumes that it remains intact across this call; since the insn has been recognized already we call insn_extract direct. */ extract_insn_cached (insn); } } /* Record that we are currently outputting label NUM with prefix PREFIX. It it's the label we're looking for, reset the ccfsm machinery. Called from ASM_OUTPUT_INTERNAL_LABEL. */ static void arc_ccfsm_at_label (const char *prefix, int num, struct arc_ccfsm *state) { if (state->state == 3 && state->target_label == num && !strcmp (prefix, "L")) { state->state = 0; state->target_insn = NULL; } } /* We are considering a conditional branch with the condition COND. Check if we want to conditionalize a delay slot insn, and if so modify the ccfsm state accordingly. REVERSE says branch will branch when the condition is false. */ void arc_ccfsm_record_condition (rtx cond, bool reverse, rtx_insn *jump, struct arc_ccfsm *state) { rtx_insn *seq_insn = NEXT_INSN (PREV_INSN (jump)); if (!state) state = &arc_ccfsm_current; gcc_assert (state->state == 0); if (seq_insn != jump) { rtx insn = XVECEXP (PATTERN (seq_insn), 0, 1); if (!as_a (insn)->deleted () && INSN_ANNULLED_BRANCH_P (jump) && (TARGET_AT_DBR_CONDEXEC || INSN_FROM_TARGET_P (insn))) { state->cond = cond; state->cc = get_arc_condition_code (cond); if (!reverse) arc_ccfsm_current.cc = ARC_INVERSE_CONDITION_CODE (state->cc); rtx pat = PATTERN (insn); if (GET_CODE (pat) == COND_EXEC) gcc_assert ((INSN_FROM_TARGET_P (insn) ? ARC_INVERSE_CONDITION_CODE (state->cc) : state->cc) == get_arc_condition_code (XEXP (pat, 0))); else state->state = 5; } } } /* Update *STATE as we would when we emit INSN. */ static void arc_ccfsm_post_advance (rtx_insn *insn, struct arc_ccfsm *state) { enum attr_type type; if (LABEL_P (insn)) arc_ccfsm_at_label ("L", CODE_LABEL_NUMBER (insn), state); else if (JUMP_P (insn) && GET_CODE (PATTERN (insn)) != ADDR_VEC && GET_CODE (PATTERN (insn)) != ADDR_DIFF_VEC && ((type = get_attr_type (insn)) == TYPE_BRANCH || ((type == TYPE_UNCOND_BRANCH || type == TYPE_RETURN) && ARC_CCFSM_BRANCH_DELETED_P (state)))) { if (ARC_CCFSM_BRANCH_DELETED_P (state)) ARC_CCFSM_RECORD_BRANCH_DELETED (state); else { rtx src = SET_SRC (PATTERN (insn)); arc_ccfsm_record_condition (XEXP (src, 0), XEXP (src, 1) == pc_rtx, insn, state); } } else if (arc_ccfsm_current.state == 5) arc_ccfsm_current.state = 0; } /* Return true if the current insn, which is a conditional branch, is to be deleted. */ bool arc_ccfsm_branch_deleted_p (void) { return ARC_CCFSM_BRANCH_DELETED_P (&arc_ccfsm_current); } /* Record a branch isn't output because subsequent insns can be conditionalized. */ void arc_ccfsm_record_branch_deleted (void) { ARC_CCFSM_RECORD_BRANCH_DELETED (&arc_ccfsm_current); } /* During insn output, indicate if the current insn is predicated. */ bool arc_ccfsm_cond_exec_p (void) { return (cfun->machine->prescan_initialized && ARC_CCFSM_COND_EXEC_P (&arc_ccfsm_current)); } /* When deciding if an insn should be output short, we want to know something about the following insns: - if another insn follows which we know we can output as a short insn before an alignment-sensitive point, we can output this insn short: the decision about the eventual alignment can be postponed. - if a to-be-aligned label comes next, we should output this insn such as to get / preserve 4-byte alignment. - if a likely branch without delay slot insn, or a call with an immediately following short insn comes next, we should out output this insn such as to get / preserve 2 mod 4 unalignment. - do the same for a not completely unlikely branch with a short insn following before any other branch / label. - in order to decide if we are actually looking at a branch, we need to call arc_ccfsm_advance. - in order to decide if we are looking at a short insn, we should know if it is conditionalized. To a first order of approximation this is the case if the state from arc_ccfsm_advance from before this insn indicates the insn is conditionalized. However, a further refinement could be to not conditionalize an insn if the destination register(s) is/are dead in the non-executed case. */ /* Return non-zero if INSN should be output as a short insn. UNALIGN is zero if the current insn is aligned to a 4-byte-boundary, two otherwise. If CHECK_ATTR is greater than 0, check the iscompact attribute first. */ static int arc_verify_short (rtx_insn *insn, int, int check_attr) { enum attr_iscompact iscompact; if (check_attr > 0) { iscompact = get_attr_iscompact (insn); if (iscompact == ISCOMPACT_FALSE) return 0; } return (get_attr_length (insn) & 2) != 0; } /* When outputting an instruction (alternative) that can potentially be short, output the short suffix if the insn is in fact short, and update cfun->machine->unalign accordingly. */ static void output_short_suffix (FILE *file) { rtx_insn *insn = current_output_insn; if (!insn) return; if (arc_verify_short (insn, cfun->machine->unalign, 1)) { fprintf (file, "_s"); cfun->machine->unalign ^= 2; } /* Restore recog_operand. */ extract_insn_cached (insn); } /* Implement FINAL_PRESCAN_INSN. */ void arc_final_prescan_insn (rtx_insn *insn, rtx *opvec ATTRIBUTE_UNUSED, int noperands ATTRIBUTE_UNUSED) { if (TARGET_DUMPISIZE) fprintf (asm_out_file, "\n; at %04x\n", INSN_ADDRESSES (INSN_UID (insn))); if (!cfun->machine->prescan_initialized) { /* Clear lingering state from branch shortening. */ memset (&arc_ccfsm_current, 0, sizeof arc_ccfsm_current); cfun->machine->prescan_initialized = 1; } arc_ccfsm_advance (insn, &arc_ccfsm_current); } /* Given FROM and TO register numbers, say whether this elimination is allowed. Frame pointer elimination is automatically handled. All eliminations are permissible. If we need a frame pointer, we must eliminate ARG_POINTER_REGNUM into FRAME_POINTER_REGNUM and not into STACK_POINTER_REGNUM. */ static bool arc_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to) { return ((to == HARD_FRAME_POINTER_REGNUM) || (to == STACK_POINTER_REGNUM)); } /* Define the offset between two registers, one to be eliminated, and the other its replacement, at the start of a routine. */ int arc_initial_elimination_offset (int from, int to) { if (!cfun->machine->frame_info.initialized) arc_compute_frame_size (); if (from == ARG_POINTER_REGNUM && to == HARD_FRAME_POINTER_REGNUM) { return (cfun->machine->frame_info.extra_size + cfun->machine->frame_info.reg_size); } if (from == ARG_POINTER_REGNUM && to == STACK_POINTER_REGNUM) { return (cfun->machine->frame_info.total_size - cfun->machine->frame_info.pretend_size); } if ((from == FRAME_POINTER_REGNUM) && (to == STACK_POINTER_REGNUM)) { return (cfun->machine->frame_info.total_size - (cfun->machine->frame_info.pretend_size + cfun->machine->frame_info.extra_size + cfun->machine->frame_info.reg_size)); } if ((from == FRAME_POINTER_REGNUM) && (to == HARD_FRAME_POINTER_REGNUM)) return 0; gcc_unreachable (); } static bool arc_frame_pointer_required (void) { return cfun->calls_alloca || crtl->calls_eh_return; } /* Return the destination address of a branch. */ static int branch_dest (rtx branch) { rtx pat = PATTERN (branch); rtx dest = (GET_CODE (pat) == PARALLEL ? SET_SRC (XVECEXP (pat, 0, 0)) : SET_SRC (pat)); int dest_uid; if (GET_CODE (dest) == IF_THEN_ELSE) dest = XEXP (dest, XEXP (dest, 1) == pc_rtx ? 2 : 1); dest = XEXP (dest, 0); dest_uid = INSN_UID (dest); return INSN_ADDRESSES (dest_uid); } /* Implement TARGET_ENCODE_SECTION_INFO hook. */ static void arc_encode_section_info (tree decl, rtx rtl, int first) { /* For sdata, SYMBOL_FLAG_LOCAL and SYMBOL_FLAG_FUNCTION. This clears machine specific flags, so has to come first. */ default_encode_section_info (decl, rtl, first); /* Check if it is a function, and whether it has the [long/medium/short]_call attribute specified. */ if (TREE_CODE (decl) == FUNCTION_DECL) { rtx symbol = XEXP (rtl, 0); int flags = SYMBOL_REF_FLAGS (symbol); tree attr = (TREE_TYPE (decl) != error_mark_node ? TYPE_ATTRIBUTES (TREE_TYPE (decl)) : NULL_TREE); tree long_call_attr = lookup_attribute ("long_call", attr); tree medium_call_attr = lookup_attribute ("medium_call", attr); tree short_call_attr = lookup_attribute ("short_call", attr); if (long_call_attr != NULL_TREE) flags |= SYMBOL_FLAG_LONG_CALL; else if (medium_call_attr != NULL_TREE) flags |= SYMBOL_FLAG_MEDIUM_CALL; else if (short_call_attr != NULL_TREE) flags |= SYMBOL_FLAG_SHORT_CALL; SYMBOL_REF_FLAGS (symbol) = flags; } else if (TREE_CODE (decl) == VAR_DECL) { rtx symbol = XEXP (rtl, 0); tree attr = (TREE_TYPE (decl) != error_mark_node ? DECL_ATTRIBUTES (decl) : NULL_TREE); tree sec_attr = lookup_attribute ("section", attr); if (sec_attr) { const char *sec_name = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (sec_attr))); if (strcmp (sec_name, ".cmem") == 0 || strcmp (sec_name, ".cmem_shared") == 0 || strcmp (sec_name, ".cmem_private") == 0) SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_CMEM; } } } /* This is how to output a definition of an internal numbered label where PREFIX is the class of label and NUM is the number within the class. */ static void arc_internal_label (FILE *stream, const char *prefix, unsigned long labelno) { if (cfun) arc_ccfsm_at_label (prefix, labelno, &arc_ccfsm_current); default_internal_label (stream, prefix, labelno); } /* Set the cpu type and print out other fancy things, at the top of the file. */ static void arc_file_start (void) { default_file_start (); fprintf (asm_out_file, "\t.cpu %s\n", arc_cpu_string); /* Set some want to have build attributes. */ asm_fprintf (asm_out_file, "\t.arc_attribute Tag_ARC_PCS_config, %d\n", ATTRIBUTE_PCS); asm_fprintf (asm_out_file, "\t.arc_attribute Tag_ARC_ABI_rf16, %d\n", TARGET_RF16 ? 1 : 0); asm_fprintf (asm_out_file, "\t.arc_attribute Tag_ARC_ABI_pic, %d\n", flag_pic ? 2 : 0); asm_fprintf (asm_out_file, "\t.arc_attribute Tag_ARC_ABI_tls, %d\n", (arc_tp_regno != -1) ? 1 : 0); asm_fprintf (asm_out_file, "\t.arc_attribute Tag_ARC_ABI_sda, %d\n", TARGET_NO_SDATA_SET ? 0 : 2); asm_fprintf (asm_out_file, "\t.arc_attribute Tag_ARC_ABI_exceptions, %d\n", TARGET_OPTFPE ? 1 : 0); if (TARGET_V2) asm_fprintf (asm_out_file, "\t.arc_attribute Tag_ARC_CPU_variation, %d\n", (arc_tune < ARC_TUNE_CORE_3) ? 2 : (arc_tune == ARC_TUNE_CORE_3 ? 3 : 4)); } /* Implement `TARGET_ASM_FILE_END'. */ /* Outputs to the stdio stream FILE jli related text. */ void arc_file_end (void) { arc_jli_section *sec = arc_jli_sections; while (sec != NULL) { fprintf (asm_out_file, "\n"); fprintf (asm_out_file, "# JLI entry for function "); assemble_name (asm_out_file, sec->name); fprintf (asm_out_file, "\n\t.section .jlitab, \"axG\", @progbits, " ".jlitab."); assemble_name (asm_out_file, sec->name); fprintf (asm_out_file,", comdat\n"); fprintf (asm_out_file, "\t.align\t4\n"); fprintf (asm_out_file, "__jli."); assemble_name (asm_out_file, sec->name); fprintf (asm_out_file, ":\n\t.weak __jli."); assemble_name (asm_out_file, sec->name); fprintf (asm_out_file, "\n\tb\t@"); assemble_name (asm_out_file, sec->name); fprintf (asm_out_file, "\n"); sec = sec->next; } file_end_indicate_exec_stack (); } /* Cost functions. */ /* Compute a (partial) cost for rtx X. Return true if the complete cost has been computed, and false if subexpressions should be scanned. In either case, *TOTAL contains the cost result. */ static bool arc_rtx_costs (rtx x, machine_mode mode, int outer_code, int opno ATTRIBUTE_UNUSED, int *total, bool speed) { int code = GET_CODE (x); switch (code) { /* Small integers are as cheap as registers. */ case CONST_INT: { bool nolimm = false; /* Can we do without long immediate? */ nolimm = false; if (UNSIGNED_INT6 (INTVAL (x))) nolimm = true; else { switch (outer_code) { case AND: /* bclr, bmsk, ext[bw] */ if (satisfies_constraint_Ccp (x) /* bclr */ || satisfies_constraint_C1p (x) /* bmsk */) nolimm = true; break; case IOR: /* bset */ if (satisfies_constraint_C0p (x)) /* bset */ nolimm = true; break; case XOR: if (satisfies_constraint_C0p (x)) /* bxor */ nolimm = true; break; case SET: if (UNSIGNED_INT8 (INTVAL (x))) nolimm = true; if (satisfies_constraint_Chi (x)) nolimm = true; if (satisfies_constraint_Clo (x)) nolimm = true; break; case MULT: if (TARGET_MUL64_SET) if (SIGNED_INT12 (INTVAL (x))) nolimm = true; break; default: break; } } if (nolimm) { *total = 0; return true; } } /* FALLTHRU */ /* 4 byte values can be fetched as immediate constants - let's give that the cost of an extra insn. */ case CONST: case LABEL_REF: case SYMBOL_REF: *total = speed ? COSTS_N_INSNS (1) : COSTS_N_INSNS (4); return true; case CONST_DOUBLE: { rtx first, second; if (TARGET_DPFP) { *total = COSTS_N_INSNS (1); return true; } split_double (x, &first, &second); *total = COSTS_N_INSNS (!SMALL_INT (INTVAL (first)) + !SMALL_INT (INTVAL (second))); return true; } /* Encourage synth_mult to find a synthetic multiply when reasonable. If we need more than 12 insns to do a multiply, then go out-of-line, since the call overhead will be < 10% of the cost of the multiply. */ case ASHIFT: case ASHIFTRT: case LSHIFTRT: if (TARGET_BARREL_SHIFTER) { if (CONSTANT_P (XEXP (x, 0))) { *total += rtx_cost (XEXP (x, 1), mode, (enum rtx_code) code, 0, speed); return true; } *total = COSTS_N_INSNS (1); } else if (GET_CODE (XEXP (x, 1)) != CONST_INT) *total = COSTS_N_INSNS (16); else { *total = COSTS_N_INSNS (INTVAL (XEXP ((x), 1))); /* ??? want_to_gcse_p can throw negative shift counts at us, and then panics when it gets a negative cost as result. Seen for gcc.c-torture/compile/20020710-1.c -Os . */ if (*total < 0) *total = 0; } return false; case DIV: case UDIV: if (GET_MODE_CLASS (mode) == MODE_FLOAT && (TARGET_FP_SP_SQRT || TARGET_FP_DP_SQRT)) *total = COSTS_N_INSNS(1); else if (GET_MODE_CLASS (mode) == MODE_INT && TARGET_DIVREM) *total = COSTS_N_INSNS(1); else if (speed) *total = COSTS_N_INSNS(30); else *total = COSTS_N_INSNS(1); return false; case MULT: if ((TARGET_DPFP && GET_MODE (x) == DFmode)) *total = COSTS_N_INSNS (1); else if (speed) *total= arc_multcost; /* We do not want synth_mult sequences when optimizing for size. */ else if (TARGET_ANY_MPY) *total = COSTS_N_INSNS (1); else *total = COSTS_N_INSNS (2); return false; case PLUS: if (outer_code == MEM && CONST_INT_P (XEXP (x, 1)) && RTX_OK_FOR_OFFSET_P (mode, XEXP (x, 1))) { *total = 0; return true; } if ((GET_CODE (XEXP (x, 0)) == ASHIFT && _1_2_3_operand (XEXP (XEXP (x, 0), 1), VOIDmode)) || (GET_CODE (XEXP (x, 0)) == MULT && _2_4_8_operand (XEXP (XEXP (x, 0), 1), VOIDmode))) { if (CONSTANT_P (XEXP (x, 1)) && !speed) *total += COSTS_N_INSNS (4); *total += rtx_cost (XEXP (XEXP (x, 0), 0), mode, PLUS, 1, speed); return true; } return false; case MINUS: if ((GET_CODE (XEXP (x, 1)) == ASHIFT && _1_2_3_operand (XEXP (XEXP (x, 1), 1), VOIDmode)) || (GET_CODE (XEXP (x, 1)) == MULT && _2_4_8_operand (XEXP (XEXP (x, 1), 1), VOIDmode))) { if (CONSTANT_P (XEXP (x, 0)) && !speed) *total += COSTS_N_INSNS (4); *total += rtx_cost (XEXP (XEXP (x, 1), 0), mode, PLUS, 1, speed); return true; } return false; case COMPARE: { rtx op0 = XEXP (x, 0); rtx op1 = XEXP (x, 1); if (GET_CODE (op0) == ZERO_EXTRACT && op1 == const0_rtx && XEXP (op0, 1) == const1_rtx) { /* btst / bbit0 / bbit1: Small integers and registers are free; everything else can be put in a register. */ mode = GET_MODE (XEXP (op0, 0)); *total = (rtx_cost (XEXP (op0, 0), mode, SET, 1, speed) + rtx_cost (XEXP (op0, 2), mode, SET, 1, speed)); return true; } if (GET_CODE (op0) == AND && op1 == const0_rtx && satisfies_constraint_C1p (XEXP (op0, 1))) { /* bmsk.f */ *total = rtx_cost (XEXP (op0, 0), VOIDmode, SET, 1, speed); return true; } /* add.f */ if (GET_CODE (op1) == NEG) { /* op0 might be constant, the inside of op1 is rather unlikely to be so. So swapping the operands might lower the cost. */ mode = GET_MODE (op0); *total = (rtx_cost (op0, mode, PLUS, 1, speed) + rtx_cost (XEXP (op1, 0), mode, PLUS, 0, speed)); } return false; } case EQ: case NE: if (outer_code == IF_THEN_ELSE && GET_CODE (XEXP (x, 0)) == ZERO_EXTRACT && XEXP (x, 1) == const0_rtx && XEXP (XEXP (x, 0), 1) == const1_rtx) { /* btst / bbit0 / bbit1: Small integers and registers are free; everything else can be put in a register. */ rtx op0 = XEXP (x, 0); mode = GET_MODE (XEXP (op0, 0)); *total = (rtx_cost (XEXP (op0, 0), mode, SET, 1, speed) + rtx_cost (XEXP (op0, 2), mode, SET, 1, speed)); return true; } /* Fall through. */ /* scc_insn expands into two insns. */ case GTU: case GEU: case LEU: if (mode == SImode) *total += COSTS_N_INSNS (1); return false; case LTU: /* might use adc. */ if (mode == SImode) *total += COSTS_N_INSNS (1) - 1; return false; default: return false; } } /* Return true if ADDR is a valid pic address. A valid pic address on arc should look like const (unspec (SYMBOL_REF/LABEL) (ARC_UNSPEC_GOTOFF/ARC_UNSPEC_GOT)) */ bool arc_legitimate_pic_addr_p (rtx addr) { if (GET_CODE (addr) != CONST) return false; addr = XEXP (addr, 0); if (GET_CODE (addr) == PLUS) { if (GET_CODE (XEXP (addr, 1)) != CONST_INT) return false; addr = XEXP (addr, 0); } if (GET_CODE (addr) != UNSPEC || XVECLEN (addr, 0) != 1) return false; /* Must be one of @GOT, @GOTOFF, @GOTOFFPC, @tlsgd, tlsie. */ if (XINT (addr, 1) != ARC_UNSPEC_GOT && XINT (addr, 1) != ARC_UNSPEC_GOTOFF && XINT (addr, 1) != ARC_UNSPEC_GOTOFFPC && XINT (addr, 1) != UNSPEC_TLS_GD && XINT (addr, 1) != UNSPEC_TLS_IE) return false; if (GET_CODE (XVECEXP (addr, 0, 0)) != SYMBOL_REF && GET_CODE (XVECEXP (addr, 0, 0)) != LABEL_REF) return false; return true; } /* Return true if OP contains a symbol reference. */ static bool symbolic_reference_mentioned_p (rtx op) { register const char *fmt; register int i; if (GET_CODE (op) == SYMBOL_REF || GET_CODE (op) == LABEL_REF) return true; fmt = GET_RTX_FORMAT (GET_CODE (op)); for (i = GET_RTX_LENGTH (GET_CODE (op)) - 1; i >= 0; i--) { if (fmt[i] == 'E') { register int j; for (j = XVECLEN (op, i) - 1; j >= 0; j--) if (symbolic_reference_mentioned_p (XVECEXP (op, i, j))) return true; } else if (fmt[i] == 'e' && symbolic_reference_mentioned_p (XEXP (op, i))) return true; } return false; } /* Return true if OP contains a SYMBOL_REF that is not wrapped in an unspec. If SKIP_LOCAL is true, skip symbols that bind locally. This is used further down in this file, and, without SKIP_LOCAL, in the addsi3 / subsi3 expanders when generating PIC code. */ bool arc_raw_symbolic_reference_mentioned_p (rtx op, bool skip_local) { register const char *fmt; register int i; if (GET_CODE(op) == UNSPEC) return false; if (GET_CODE (op) == SYMBOL_REF) { if (SYMBOL_REF_TLS_MODEL (op)) return true; if (!flag_pic) return false; tree decl = SYMBOL_REF_DECL (op); return !skip_local || !decl || !default_binds_local_p (decl); } fmt = GET_RTX_FORMAT (GET_CODE (op)); for (i = GET_RTX_LENGTH (GET_CODE (op)) - 1; i >= 0; i--) { if (fmt[i] == 'E') { register int j; for (j = XVECLEN (op, i) - 1; j >= 0; j--) if (arc_raw_symbolic_reference_mentioned_p (XVECEXP (op, i, j), skip_local)) return true; } else if (fmt[i] == 'e' && arc_raw_symbolic_reference_mentioned_p (XEXP (op, i), skip_local)) return true; } return false; } /* The __tls_get_attr symbol. */ static GTY(()) rtx arc_tls_symbol; /* Emit a call to __tls_get_addr. TI is the argument to this function. RET is an RTX for the return value location. The entire insn sequence is returned. */ static rtx arc_call_tls_get_addr (rtx ti) { rtx arg = gen_rtx_REG (Pmode, R0_REG); rtx ret = gen_rtx_REG (Pmode, R0_REG); rtx fn; rtx_insn *insn; if (!arc_tls_symbol) arc_tls_symbol = init_one_libfunc ("__tls_get_addr"); emit_move_insn (arg, ti); fn = gen_rtx_MEM (SImode, arc_tls_symbol); insn = emit_call_insn (gen_call_value (ret, fn, const0_rtx)); RTL_CONST_CALL_P (insn) = 1; use_reg (&CALL_INSN_FUNCTION_USAGE (insn), ret); use_reg (&CALL_INSN_FUNCTION_USAGE (insn), arg); return ret; } #define DTPOFF_ZERO_SYM ".tdata" /* Return a legitimized address for ADDR, which is a SYMBOL_REF with tls_model MODEL. */ static rtx arc_legitimize_tls_address (rtx addr, enum tls_model model) { rtx tmp; if (!flag_pic && model == TLS_MODEL_LOCAL_DYNAMIC) model = TLS_MODEL_LOCAL_EXEC; /* The TP pointer needs to be set. */ gcc_assert (arc_tp_regno != -1); switch (model) { case TLS_MODEL_GLOBAL_DYNAMIC: tmp = gen_reg_rtx (Pmode); emit_move_insn (tmp, arc_unspec_offset (addr, UNSPEC_TLS_GD)); return arc_call_tls_get_addr (tmp); case TLS_MODEL_LOCAL_DYNAMIC: rtx base; tree decl; const char *base_name; decl = SYMBOL_REF_DECL (addr); base_name = DTPOFF_ZERO_SYM; if (decl && bss_initializer_p (decl)) base_name = ".tbss"; base = gen_rtx_SYMBOL_REF (Pmode, base_name); tmp = gen_reg_rtx (Pmode); emit_move_insn (tmp, arc_unspec_offset (base, UNSPEC_TLS_GD)); base = arc_call_tls_get_addr (tmp); return gen_rtx_PLUS (Pmode, force_reg (Pmode, base), arc_unspec_offset (addr, UNSPEC_TLS_OFF)); case TLS_MODEL_INITIAL_EXEC: addr = arc_unspec_offset (addr, UNSPEC_TLS_IE); addr = copy_to_mode_reg (Pmode, gen_const_mem (Pmode, addr)); return gen_rtx_PLUS (Pmode, gen_rtx_REG (Pmode, arc_tp_regno), addr); case TLS_MODEL_LOCAL_EXEC: addr = arc_unspec_offset (addr, UNSPEC_TLS_OFF); return gen_rtx_PLUS (Pmode, gen_rtx_REG (Pmode, arc_tp_regno), addr); default: gcc_unreachable (); } } /* Return true if SYMBOL_REF X binds locally. */ static bool arc_symbol_binds_local_p (const_rtx x) { return (SYMBOL_REF_DECL (x) ? targetm.binds_local_p (SYMBOL_REF_DECL (x)) : SYMBOL_REF_LOCAL_P (x)); } /* Legitimize a pic address reference in ADDR. The return value is the legitimated address. */ static rtx arc_legitimize_pic_address (rtx addr) { if (!flag_pic) return addr; switch (GET_CODE (addr)) { case UNSPEC: /* Can be one or our GOT or GOTOFFPC unspecs. This situation happens when an address is not a legitimate constant and we need the resolve it via force_reg in prepare_move_operands. */ switch (XINT (addr, 1)) { case ARC_UNSPEC_GOT: case ARC_UNSPEC_GOTOFFPC: /* Recover the symbol ref. */ addr = XVECEXP (addr, 0, 0); break; default: return addr; } /* Fall through. */ case SYMBOL_REF: /* TLS symbols are handled in different place. */ if (SYMBOL_REF_TLS_MODEL (addr)) return addr; /* This symbol must be referenced via a load from the Global Offset Table (@GOTPC). */ if (!arc_symbol_binds_local_p (addr)) return gen_const_mem (Pmode, arc_unspec_offset (addr, ARC_UNSPEC_GOT)); /* Local symb: use @pcl to access it. */ /* Fall through. */ case LABEL_REF: return arc_unspec_offset (addr, ARC_UNSPEC_GOTOFFPC); default: break; } return addr; } /* Output address constant X to FILE, taking PIC into account. */ static void arc_output_pic_addr_const (FILE * file, rtx x, int code) { char buf[256]; restart: switch (GET_CODE (x)) { case PC: if (flag_pic) putc ('.', file); else gcc_unreachable (); break; case SYMBOL_REF: output_addr_const (file, x); /* Local functions do not get references through the PLT. */ if (code == 'P' && ! SYMBOL_REF_LOCAL_P (x)) fputs ("@plt", file); break; case LABEL_REF: ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (XEXP (x, 0))); assemble_name (file, buf); break; case CODE_LABEL: ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x)); assemble_name (file, buf); break; case CONST_INT: fprintf (file, HOST_WIDE_INT_PRINT_DEC, INTVAL (x)); break; case CONST: arc_output_pic_addr_const (file, XEXP (x, 0), code); break; case CONST_DOUBLE: if (GET_MODE (x) == VOIDmode) { /* We can use %d if the number is one word and positive. */ if (CONST_DOUBLE_HIGH (x)) fprintf (file, HOST_WIDE_INT_PRINT_DOUBLE_HEX, CONST_DOUBLE_HIGH (x), CONST_DOUBLE_LOW (x)); else if (CONST_DOUBLE_LOW (x) < 0) fprintf (file, HOST_WIDE_INT_PRINT_HEX, CONST_DOUBLE_LOW (x)); else fprintf (file, HOST_WIDE_INT_PRINT_DEC, CONST_DOUBLE_LOW (x)); } else /* We can't handle floating point constants; PRINT_OPERAND must handle them. */ output_operand_lossage ("floating constant misused"); break; case PLUS: /* FIXME: Not needed here. */ /* Some assemblers need integer constants to appear last (eg masm). */ if (GET_CODE (XEXP (x, 0)) == CONST_INT) { arc_output_pic_addr_const (file, XEXP (x, 1), code); fprintf (file, "+"); arc_output_pic_addr_const (file, XEXP (x, 0), code); } else if (GET_CODE (XEXP (x, 1)) == CONST_INT) { arc_output_pic_addr_const (file, XEXP (x, 0), code); if (INTVAL (XEXP (x, 1)) >= 0) fprintf (file, "+"); arc_output_pic_addr_const (file, XEXP (x, 1), code); } else gcc_unreachable(); break; case MINUS: /* Avoid outputting things like x-x or x+5-x, since some assemblers can't handle that. */ x = simplify_subtraction (x); if (GET_CODE (x) != MINUS) goto restart; arc_output_pic_addr_const (file, XEXP (x, 0), code); fprintf (file, "-"); if (GET_CODE (XEXP (x, 1)) == CONST_INT && INTVAL (XEXP (x, 1)) < 0) { fprintf (file, "("); arc_output_pic_addr_const (file, XEXP (x, 1), code); fprintf (file, ")"); } else arc_output_pic_addr_const (file, XEXP (x, 1), code); break; case ZERO_EXTEND: case SIGN_EXTEND: arc_output_pic_addr_const (file, XEXP (x, 0), code); break; case UNSPEC: const char *suffix; bool pcrel; pcrel = false; rtx base; base = NULL; gcc_assert (XVECLEN (x, 0) >= 1); switch (XINT (x, 1)) { case ARC_UNSPEC_GOT: suffix = "@gotpc", pcrel = true; break; case ARC_UNSPEC_GOTOFF: suffix = "@gotoff"; break; case ARC_UNSPEC_GOTOFFPC: suffix = "@pcl", pcrel = true; break; case ARC_UNSPEC_PLT: suffix = "@plt"; break; case UNSPEC_TLS_GD: suffix = "@tlsgd", pcrel = true; break; case UNSPEC_TLS_IE: suffix = "@tlsie", pcrel = true; break; case UNSPEC_TLS_OFF: if (XVECLEN (x, 0) == 2) base = XVECEXP (x, 0, 1); if (SYMBOL_REF_TLS_MODEL (XVECEXP (x, 0, 0)) == TLS_MODEL_LOCAL_EXEC || (!flag_pic && !base)) suffix = "@tpoff"; else suffix = "@dtpoff"; break; default: suffix = "@invalid"; output_operand_lossage ("invalid UNSPEC as operand: %d", XINT (x,1)); break; } if (pcrel) fputs ("pcl,", file); arc_output_pic_addr_const (file, XVECEXP (x, 0, 0), code); fputs (suffix, file); if (base) arc_output_pic_addr_const (file, base, code); break; default: output_operand_lossage ("invalid expression as operand"); } } /* The function returning the number of words, at the beginning of an argument, must be put in registers. The returned value must be zero for arguments that are passed entirely in registers or that are entirely pushed on the stack. On some machines, certain arguments must be passed partially in registers and partially in memory. On these machines, typically the first N words of arguments are passed in registers, and the rest on the stack. If a multi-word argument (a `double' or a structure) crosses that boundary, its first few words must be passed in registers and the rest must be pushed. This function tells the compiler when this occurs, and how many of the words should go in registers. `FUNCTION_ARG' for these arguments should return the first register to be used by the caller for this argument; likewise `FUNCTION_INCOMING_ARG', for the called function. The function is used to implement macro FUNCTION_ARG_PARTIAL_NREGS. */ /* If REGNO is the least arg reg available then what is the total number of arg regs available. */ #define GPR_REST_ARG_REGS(REGNO) \ ((REGNO) <= MAX_ARC_PARM_REGS ? MAX_ARC_PARM_REGS - (REGNO) : 0 ) /* Since arc parm regs are contiguous. */ #define ARC_NEXT_ARG_REG(REGNO) ( (REGNO) + 1 ) /* Implement TARGET_ARG_PARTIAL_BYTES. */ static int arc_arg_partial_bytes (cumulative_args_t cum_v, const function_arg_info &arg) { CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); int bytes = arg.promoted_size_in_bytes (); int words = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; int arg_num = *cum; int ret; arg_num = ROUND_ADVANCE_CUM (arg_num, arg.mode, arg.type); ret = GPR_REST_ARG_REGS (arg_num); /* ICEd at function.c:2361, and ret is copied to data->partial */ ret = (ret >= words ? 0 : ret * UNITS_PER_WORD); return ret; } /* Implement TARGET_FUNCTION_ARG. On the ARC the first MAX_ARC_PARM_REGS args are normally in registers and the rest are pushed. */ static rtx arc_function_arg (cumulative_args_t cum_v, const function_arg_info &arg) { CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); int arg_num = *cum; rtx ret; const char *debstr ATTRIBUTE_UNUSED; arg_num = ROUND_ADVANCE_CUM (arg_num, arg.mode, arg.type); /* Return a marker for use in the call instruction. */ if (arg.end_marker_p ()) { ret = const0_rtx; debstr = "<0>"; } else if (GPR_REST_ARG_REGS (arg_num) > 0) { ret = gen_rtx_REG (arg.mode, arg_num); debstr = reg_names [arg_num]; } else { ret = NULL_RTX; debstr = "memory"; } return ret; } /* Implement TARGET_FUNCTION_ARG_ADVANCE. */ /* For the ARC: the cum set here is passed on to function_arg where we look at its value and say which reg to use. Strategy: advance the regnumber here till we run out of arg regs, then set *cum to last reg. In function_arg, since *cum > last arg reg we would return 0 and thus the arg will end up on the stack. For straddling args of course function_arg_partial_nregs will come into play. */ static void arc_function_arg_advance (cumulative_args_t cum_v, const function_arg_info &arg) { CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); int bytes = arg.promoted_size_in_bytes (); int words = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; int i; if (words) *cum = ROUND_ADVANCE_CUM (*cum, arg.mode, arg.type); for (i = 0; i < words; i++) *cum = ARC_NEXT_ARG_REG (*cum); } /* Define how to find the value returned by a function. VALTYPE is the data type of the value (as a tree). If the precise function being called is known, FN_DECL_OR_TYPE is its FUNCTION_DECL; otherwise, FN_DECL_OR_TYPE is its type. */ static rtx arc_function_value (const_tree valtype, const_tree fn_decl_or_type ATTRIBUTE_UNUSED, bool outgoing ATTRIBUTE_UNUSED) { machine_mode mode = TYPE_MODE (valtype); int unsignedp ATTRIBUTE_UNUSED; unsignedp = TYPE_UNSIGNED (valtype); if (INTEGRAL_TYPE_P (valtype) || TREE_CODE (valtype) == OFFSET_TYPE) PROMOTE_MODE (mode, unsignedp, valtype); return gen_rtx_REG (mode, 0); } /* Returns the return address that is used by builtin_return_address. */ rtx arc_return_addr_rtx (int count, ATTRIBUTE_UNUSED rtx frame) { if (count != 0) return const0_rtx; return get_hard_reg_initial_val (Pmode , RETURN_ADDR_REGNUM); } /* Determine if a given RTX is a valid constant. We already know this satisfies CONSTANT_P. */ bool arc_legitimate_constant_p (machine_mode mode, rtx x) { switch (GET_CODE (x)) { case CONST: if (flag_pic) { if (arc_legitimate_pic_addr_p (x)) return true; } return arc_legitimate_constant_p (mode, XEXP (x, 0)); case SYMBOL_REF: if (SYMBOL_REF_TLS_MODEL (x)) return false; /* Fall through. */ case LABEL_REF: if (flag_pic) return false; /* Fall through. */ case CONST_INT: case CONST_DOUBLE: return true; case NEG: return arc_legitimate_constant_p (mode, XEXP (x, 0)); case PLUS: case MINUS: { bool t1 = arc_legitimate_constant_p (mode, XEXP (x, 0)); bool t2 = arc_legitimate_constant_p (mode, XEXP (x, 1)); return (t1 && t2); } case CONST_VECTOR: switch (mode) { case E_V2HImode: return TARGET_PLUS_DMPY; case E_V2SImode: case E_V4HImode: return TARGET_PLUS_QMACW; default: return false; } case UNSPEC: switch (XINT (x, 1)) { case UNSPEC_TLS_GD: case UNSPEC_TLS_OFF: case UNSPEC_TLS_IE: return true; default: /* Any other unspec ending here are pic related, hence the above constant pic address checking returned false. */ return false; } /* Fall through. */ default: fatal_insn ("unrecognized supposed constant", x); } gcc_unreachable (); } static bool arc_legitimate_address_p (machine_mode mode, rtx x, bool strict) { if (RTX_OK_FOR_BASE_P (x, strict)) return true; if (legitimate_offset_address_p (mode, x, TARGET_INDEXED_LOADS, strict)) return true; if (legitimate_scaled_address_p (mode, x, strict)) return true; if (legitimate_small_data_address_p (x, mode)) return true; if (GET_CODE (x) == CONST_INT && LARGE_INT (INTVAL (x))) return true; /* When we compile for size avoid const (@sym + offset) addresses. */ if (!flag_pic && optimize_size && !reload_completed && (GET_CODE (x) == CONST) && (GET_CODE (XEXP (x, 0)) == PLUS) && (GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF) && SYMBOL_REF_TLS_MODEL (XEXP (XEXP (x, 0), 0)) == 0 && !SYMBOL_REF_FUNCTION_P (XEXP (XEXP (x, 0), 0))) { rtx addend = XEXP (XEXP (x, 0), 1); gcc_assert (CONST_INT_P (addend)); HOST_WIDE_INT offset = INTVAL (addend); /* Allow addresses having a large offset to pass. Anyhow they will end in a limm. */ return !(offset > -1024 && offset < 1020); } if ((GET_MODE_SIZE (mode) != 16) && CONSTANT_P (x)) { return arc_legitimate_constant_p (mode, x); } if ((GET_CODE (x) == PRE_DEC || GET_CODE (x) == PRE_INC || GET_CODE (x) == POST_DEC || GET_CODE (x) == POST_INC) && RTX_OK_FOR_BASE_P (XEXP (x, 0), strict)) return true; /* We're restricted here by the `st' insn. */ if ((GET_CODE (x) == PRE_MODIFY || GET_CODE (x) == POST_MODIFY) && GET_CODE (XEXP ((x), 1)) == PLUS && rtx_equal_p (XEXP ((x), 0), XEXP (XEXP (x, 1), 0)) && legitimate_offset_address_p (QImode, XEXP (x, 1), TARGET_AUTO_MODIFY_REG, strict)) return true; return false; } /* Return true iff ADDR (a legitimate address expression) has an effect that depends on the machine mode it is used for. */ static bool arc_mode_dependent_address_p (const_rtx addr, addr_space_t) { /* SYMBOL_REF is not mode dependent: it is either a small data reference, which is valid for loads and stores, or a limm offset, which is valid for loads. Scaled indices are scaled by the access mode. */ if (GET_CODE (addr) == PLUS && GET_CODE (XEXP ((addr), 0)) == MULT) return true; return false; } /* Determine if it's legal to put X into the constant pool. */ static bool arc_cannot_force_const_mem (machine_mode mode, rtx x) { return !arc_legitimate_constant_p (mode, x); } /* IDs for all the ARC builtins. */ enum arc_builtin_id { #define DEF_BUILTIN(NAME, N_ARGS, TYPE, ICODE, MASK) \ ARC_BUILTIN_ ## NAME, #include "builtins.def" #undef DEF_BUILTIN ARC_BUILTIN_COUNT }; struct GTY(()) arc_builtin_description { enum insn_code icode; int n_args; tree fndecl; }; static GTY(()) struct arc_builtin_description arc_bdesc[ARC_BUILTIN_COUNT] = { #define DEF_BUILTIN(NAME, N_ARGS, TYPE, ICODE, MASK) \ { (enum insn_code) CODE_FOR_ ## ICODE, N_ARGS, NULL_TREE }, #include "builtins.def" #undef DEF_BUILTIN }; /* Transform UP into lowercase and write the result to LO. You must provide enough space for LO. Return LO. */ static char* arc_tolower (char *lo, const char *up) { char *lo0 = lo; for (; *up; up++, lo++) *lo = TOLOWER (*up); *lo = '\0'; return lo0; } /* Implement `TARGET_BUILTIN_DECL'. */ static tree arc_builtin_decl (unsigned id, bool initialize_p ATTRIBUTE_UNUSED) { if (id < ARC_BUILTIN_COUNT) return arc_bdesc[id].fndecl; return error_mark_node; } static void arc_init_builtins (void) { tree V4HI_type_node; tree V2SI_type_node; tree V2HI_type_node; /* Vector types based on HS SIMD elements. */ V4HI_type_node = build_vector_type_for_mode (intHI_type_node, V4HImode); V2SI_type_node = build_vector_type_for_mode (intSI_type_node, V2SImode); V2HI_type_node = build_vector_type_for_mode (intHI_type_node, V2HImode); tree pcvoid_type_node = build_pointer_type (build_qualified_type (void_type_node, TYPE_QUAL_CONST)); tree V8HI_type_node = build_vector_type_for_mode (intHI_type_node, V8HImode); tree void_ftype_void = build_function_type_list (void_type_node, NULL_TREE); tree int_ftype_int = build_function_type_list (integer_type_node, integer_type_node, NULL_TREE); tree int_ftype_pcvoid_int = build_function_type_list (integer_type_node, pcvoid_type_node, integer_type_node, NULL_TREE); tree void_ftype_usint_usint = build_function_type_list (void_type_node, long_unsigned_type_node, long_unsigned_type_node, NULL_TREE); tree int_ftype_int_int = build_function_type_list (integer_type_node, integer_type_node, integer_type_node, NULL_TREE); tree usint_ftype_usint = build_function_type_list (long_unsigned_type_node, long_unsigned_type_node, NULL_TREE); tree void_ftype_usint = build_function_type_list (void_type_node, long_unsigned_type_node, NULL_TREE); tree int_ftype_void = build_function_type_list (integer_type_node, void_type_node, NULL_TREE); tree void_ftype_int = build_function_type_list (void_type_node, integer_type_node, NULL_TREE); tree int_ftype_short = build_function_type_list (integer_type_node, short_integer_type_node, NULL_TREE); /* Old ARC SIMD types. */ tree v8hi_ftype_v8hi_v8hi = build_function_type_list (V8HI_type_node, V8HI_type_node, V8HI_type_node, NULL_TREE); tree v8hi_ftype_v8hi_int = build_function_type_list (V8HI_type_node, V8HI_type_node, integer_type_node, NULL_TREE); tree v8hi_ftype_v8hi_int_int = build_function_type_list (V8HI_type_node, V8HI_type_node, integer_type_node, integer_type_node, NULL_TREE); tree void_ftype_v8hi_int_int = build_function_type_list (void_type_node, V8HI_type_node, integer_type_node, integer_type_node, NULL_TREE); tree void_ftype_v8hi_int_int_int = build_function_type_list (void_type_node, V8HI_type_node, integer_type_node, integer_type_node, integer_type_node, NULL_TREE); tree v8hi_ftype_int_int = build_function_type_list (V8HI_type_node, integer_type_node, integer_type_node, NULL_TREE); tree void_ftype_int_int = build_function_type_list (void_type_node, integer_type_node, integer_type_node, NULL_TREE); tree v8hi_ftype_v8hi = build_function_type_list (V8HI_type_node, V8HI_type_node, NULL_TREE); /* ARCv2 SIMD types. */ tree long_ftype_v4hi_v4hi = build_function_type_list (long_long_integer_type_node, V4HI_type_node, V4HI_type_node, NULL_TREE); tree int_ftype_v2hi_v2hi = build_function_type_list (integer_type_node, V2HI_type_node, V2HI_type_node, NULL_TREE); tree v2si_ftype_v2hi_v2hi = build_function_type_list (V2SI_type_node, V2HI_type_node, V2HI_type_node, NULL_TREE); tree v2hi_ftype_v2hi_v2hi = build_function_type_list (V2HI_type_node, V2HI_type_node, V2HI_type_node, NULL_TREE); tree v2si_ftype_v2si_v2si = build_function_type_list (V2SI_type_node, V2SI_type_node, V2SI_type_node, NULL_TREE); tree v4hi_ftype_v4hi_v4hi = build_function_type_list (V4HI_type_node, V4HI_type_node, V4HI_type_node, NULL_TREE); tree long_ftype_v2si_v2hi = build_function_type_list (long_long_integer_type_node, V2SI_type_node, V2HI_type_node, NULL_TREE); /* Add the builtins. */ #define DEF_BUILTIN(NAME, N_ARGS, TYPE, ICODE, MASK) \ { \ int id = ARC_BUILTIN_ ## NAME; \ const char *Name = "__builtin_arc_" #NAME; \ char *name = (char*) alloca (1 + strlen (Name)); \ \ gcc_assert (id < ARC_BUILTIN_COUNT); \ if (MASK) \ arc_bdesc[id].fndecl \ = add_builtin_function (arc_tolower(name, Name), TYPE, id, \ BUILT_IN_MD, NULL, NULL_TREE); \ } #include "builtins.def" #undef DEF_BUILTIN } /* Helper to expand __builtin_arc_aligned (void* val, int alignval). */ static rtx arc_expand_builtin_aligned (tree exp) { tree arg0 = CALL_EXPR_ARG (exp, 0); tree arg1 = CALL_EXPR_ARG (exp, 1); fold (arg1); rtx op0 = expand_expr (arg0, NULL_RTX, VOIDmode, EXPAND_NORMAL); rtx op1 = expand_expr (arg1, NULL_RTX, VOIDmode, EXPAND_NORMAL); if (!CONST_INT_P (op1)) { /* If we can't fold the alignment to a constant integer whilst optimizing, this is probably a user error. */ if (optimize) warning (0, "%<__builtin_arc_aligned%> with non-constant alignment"); } else { HOST_WIDE_INT alignTest = INTVAL (op1); /* Check alignTest is positive, and a power of two. */ if (alignTest <= 0 || alignTest != (alignTest & -alignTest)) { error ("invalid alignment value for %<__builtin_arc_aligned%>"); return NULL_RTX; } if (CONST_INT_P (op0)) { HOST_WIDE_INT pnt = INTVAL (op0); if ((pnt & (alignTest - 1)) == 0) return const1_rtx; } else { unsigned align = get_pointer_alignment (arg0); unsigned numBits = alignTest * BITS_PER_UNIT; if (align && align >= numBits) return const1_rtx; /* Another attempt to ascertain alignment. Check the type we are pointing to. */ if (POINTER_TYPE_P (TREE_TYPE (arg0)) && TYPE_ALIGN (TREE_TYPE (TREE_TYPE (arg0))) >= numBits) return const1_rtx; } } /* Default to false. */ return const0_rtx; } /* Helper arc_expand_builtin, generates a pattern for the given icode and arguments. */ static rtx_insn * apply_GEN_FCN (enum insn_code icode, rtx *arg) { switch (insn_data[icode].n_generator_args) { case 0: return GEN_FCN (icode) (); case 1: return GEN_FCN (icode) (arg[0]); case 2: return GEN_FCN (icode) (arg[0], arg[1]); case 3: return GEN_FCN (icode) (arg[0], arg[1], arg[2]); case 4: return GEN_FCN (icode) (arg[0], arg[1], arg[2], arg[3]); case 5: return GEN_FCN (icode) (arg[0], arg[1], arg[2], arg[3], arg[4]); default: gcc_unreachable (); } } /* Expand an expression EXP that calls a built-in function, with result going to TARGET if that's convenient (and in mode MODE if that's convenient). SUBTARGET may be used as the target for computing one of EXP's operands. IGNORE is nonzero if the value is to be ignored. */ static rtx arc_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED, machine_mode mode ATTRIBUTE_UNUSED, int ignore ATTRIBUTE_UNUSED) { tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0); unsigned int id = DECL_MD_FUNCTION_CODE (fndecl); const struct arc_builtin_description *d = &arc_bdesc[id]; int i, j, n_args = call_expr_nargs (exp); rtx pat = NULL_RTX; rtx xop[5]; enum insn_code icode = d->icode; machine_mode tmode = insn_data[icode].operand[0].mode; int nonvoid; tree arg0; tree arg1; tree arg2; tree arg3; rtx op0; rtx op1; rtx op2; rtx op3; rtx op4; machine_mode mode0; machine_mode mode1; machine_mode mode2; machine_mode mode3; machine_mode mode4; if (id >= ARC_BUILTIN_COUNT) internal_error ("bad builtin fcode"); /* 1st part: Expand special builtins. */ switch (id) { case ARC_BUILTIN_NOP: emit_insn (gen_nopv ()); return NULL_RTX; case ARC_BUILTIN_RTIE: case ARC_BUILTIN_SYNC: case ARC_BUILTIN_BRK: case ARC_BUILTIN_SWI: case ARC_BUILTIN_UNIMP_S: gcc_assert (icode != 0); emit_insn (GEN_FCN (icode) (const1_rtx)); return NULL_RTX; case ARC_BUILTIN_ALIGNED: return arc_expand_builtin_aligned (exp); case ARC_BUILTIN_CLRI: target = gen_reg_rtx (SImode); emit_insn (gen_clri (target, const1_rtx)); return target; case ARC_BUILTIN_TRAP_S: case ARC_BUILTIN_SLEEP: arg0 = CALL_EXPR_ARG (exp, 0); fold (arg0); op0 = expand_expr (arg0, NULL_RTX, VOIDmode, EXPAND_NORMAL); gcc_assert (icode != 0); emit_insn (GEN_FCN (icode) (op0)); return NULL_RTX; case ARC_BUILTIN_VDORUN: case ARC_BUILTIN_VDIRUN: arg0 = CALL_EXPR_ARG (exp, 0); arg1 = CALL_EXPR_ARG (exp, 1); op0 = expand_expr (arg0, NULL_RTX, SImode, EXPAND_NORMAL); op1 = expand_expr (arg1, NULL_RTX, SImode, EXPAND_NORMAL); target = gen_rtx_REG (SImode, (id == ARC_BUILTIN_VDIRUN) ? 131 : 139); mode0 = insn_data[icode].operand[1].mode; mode1 = insn_data[icode].operand[2].mode; if (!insn_data[icode].operand[1].predicate (op0, mode0)) op0 = copy_to_mode_reg (mode0, op0); if (!insn_data[icode].operand[2].predicate (op1, mode1)) op1 = copy_to_mode_reg (mode1, op1); pat = GEN_FCN (icode) (target, op0, op1); if (!pat) return NULL_RTX; emit_insn (pat); return NULL_RTX; case ARC_BUILTIN_VDIWR: case ARC_BUILTIN_VDOWR: arg0 = CALL_EXPR_ARG (exp, 0); arg1 = CALL_EXPR_ARG (exp, 1); op0 = expand_expr (arg0, NULL_RTX, SImode, EXPAND_NORMAL); op1 = expand_expr (arg1, NULL_RTX, SImode, EXPAND_NORMAL); if (!CONST_INT_P (op0) || !(UNSIGNED_INT3 (INTVAL (op0)))) error ("operand 1 should be an unsigned 3-bit immediate"); mode1 = insn_data[icode].operand[1].mode; if (icode == CODE_FOR_vdiwr_insn) target = gen_rtx_REG (SImode, ARC_FIRST_SIMD_DMA_CONFIG_IN_REG + INTVAL (op0)); else if (icode == CODE_FOR_vdowr_insn) target = gen_rtx_REG (SImode, ARC_FIRST_SIMD_DMA_CONFIG_OUT_REG + INTVAL (op0)); else gcc_unreachable (); if (!insn_data[icode].operand[2].predicate (op1, mode1)) op1 = copy_to_mode_reg (mode1, op1); pat = GEN_FCN (icode) (target, op1); if (!pat) return NULL_RTX; emit_insn (pat); return NULL_RTX; case ARC_BUILTIN_VASRW: case ARC_BUILTIN_VSR8: case ARC_BUILTIN_VSR8AW: arg0 = CALL_EXPR_ARG (exp, 0); arg1 = CALL_EXPR_ARG (exp, 1); op0 = expand_expr (arg0, NULL_RTX, V8HImode, EXPAND_NORMAL); op1 = expand_expr (arg1, NULL_RTX, SImode, EXPAND_NORMAL); op2 = gen_rtx_REG (V8HImode, ARC_FIRST_SIMD_VR_REG); target = gen_reg_rtx (V8HImode); mode0 = insn_data[icode].operand[1].mode; mode1 = insn_data[icode].operand[2].mode; if (!insn_data[icode].operand[1].predicate (op0, mode0)) op0 = copy_to_mode_reg (mode0, op0); if ((!insn_data[icode].operand[2].predicate (op1, mode1)) || !(UNSIGNED_INT3 (INTVAL (op1)))) error ("operand 2 should be an unsigned 3-bit value (I0-I7)"); pat = GEN_FCN (icode) (target, op0, op1, op2); if (!pat) return NULL_RTX; emit_insn (pat); return target; case ARC_BUILTIN_VLD32WH: case ARC_BUILTIN_VLD32WL: case ARC_BUILTIN_VLD64: case ARC_BUILTIN_VLD32: rtx src_vreg; icode = d->icode; arg0 = CALL_EXPR_ARG (exp, 0); /* source vreg. */ arg1 = CALL_EXPR_ARG (exp, 1); /* [I]0-7. */ arg2 = CALL_EXPR_ARG (exp, 2); /* u8. */ src_vreg = expand_expr (arg0, NULL_RTX, V8HImode, EXPAND_NORMAL); op0 = expand_expr (arg1, NULL_RTX, SImode, EXPAND_NORMAL); op1 = expand_expr (arg2, NULL_RTX, SImode, EXPAND_NORMAL); op2 = gen_rtx_REG (V8HImode, ARC_FIRST_SIMD_VR_REG); /* target <- src vreg. */ emit_insn (gen_move_insn (target, src_vreg)); /* target <- vec_concat: target, mem (Ib, u8). */ mode0 = insn_data[icode].operand[3].mode; mode1 = insn_data[icode].operand[1].mode; if ((!insn_data[icode].operand[3].predicate (op0, mode0)) || !(UNSIGNED_INT3 (INTVAL (op0)))) error ("operand 1 should be an unsigned 3-bit value (I0-I7)"); if ((!insn_data[icode].operand[1].predicate (op1, mode1)) || !(UNSIGNED_INT8 (INTVAL (op1)))) error ("operand 2 should be an unsigned 8-bit value"); pat = GEN_FCN (icode) (target, op1, op2, op0); if (!pat) return NULL_RTX; emit_insn (pat); return target; case ARC_BUILTIN_VLD64W: case ARC_BUILTIN_VLD128: arg0 = CALL_EXPR_ARG (exp, 0); /* dest vreg. */ arg1 = CALL_EXPR_ARG (exp, 1); /* [I]0-7. */ op0 = gen_rtx_REG (V8HImode, ARC_FIRST_SIMD_VR_REG); op1 = expand_expr (arg0, NULL_RTX, SImode, EXPAND_NORMAL); op2 = expand_expr (arg1, NULL_RTX, SImode, EXPAND_NORMAL); /* target <- src vreg. */ target = gen_reg_rtx (V8HImode); /* target <- vec_concat: target, mem (Ib, u8). */ mode0 = insn_data[icode].operand[1].mode; mode1 = insn_data[icode].operand[2].mode; mode2 = insn_data[icode].operand[3].mode; if ((!insn_data[icode].operand[2].predicate (op1, mode1)) || !(UNSIGNED_INT3 (INTVAL (op1)))) error ("operand 1 should be an unsigned 3-bit value (I0-I7)"); if ((!insn_data[icode].operand[3].predicate (op2, mode2)) || !(UNSIGNED_INT8 (INTVAL (op2)))) error ("operand 2 should be an unsigned 8-bit value"); pat = GEN_FCN (icode) (target, op0, op1, op2); if (!pat) return NULL_RTX; emit_insn (pat); return target; case ARC_BUILTIN_VST128: case ARC_BUILTIN_VST64: arg0 = CALL_EXPR_ARG (exp, 0); /* src vreg. */ arg1 = CALL_EXPR_ARG (exp, 1); /* [I]0-7. */ arg2 = CALL_EXPR_ARG (exp, 2); /* u8. */ op0 = gen_rtx_REG (V8HImode, ARC_FIRST_SIMD_VR_REG); op1 = expand_expr (arg1, NULL_RTX, SImode, EXPAND_NORMAL); op2 = expand_expr (arg2, NULL_RTX, SImode, EXPAND_NORMAL); op3 = expand_expr (arg0, NULL_RTX, V8HImode, EXPAND_NORMAL); mode0 = insn_data[icode].operand[0].mode; mode1 = insn_data[icode].operand[1].mode; mode2 = insn_data[icode].operand[2].mode; mode3 = insn_data[icode].operand[3].mode; if ((!insn_data[icode].operand[1].predicate (op1, mode1)) || !(UNSIGNED_INT3 (INTVAL (op1)))) error ("operand 2 should be an unsigned 3-bit value (I0-I7)"); if ((!insn_data[icode].operand[2].predicate (op2, mode2)) || !(UNSIGNED_INT8 (INTVAL (op2)))) error ("operand 3 should be an unsigned 8-bit value"); if (!insn_data[icode].operand[3].predicate (op3, mode3)) op3 = copy_to_mode_reg (mode3, op3); pat = GEN_FCN (icode) (op0, op1, op2, op3); if (!pat) return NULL_RTX; emit_insn (pat); return NULL_RTX; case ARC_BUILTIN_VST16_N: case ARC_BUILTIN_VST32_N: arg0 = CALL_EXPR_ARG (exp, 0); /* source vreg. */ arg1 = CALL_EXPR_ARG (exp, 1); /* u3. */ arg2 = CALL_EXPR_ARG (exp, 2); /* [I]0-7. */ arg3 = CALL_EXPR_ARG (exp, 3); /* u8. */ op0 = expand_expr (arg3, NULL_RTX, SImode, EXPAND_NORMAL); op1 = gen_rtx_REG (V8HImode, ARC_FIRST_SIMD_VR_REG); op2 = expand_expr (arg2, NULL_RTX, SImode, EXPAND_NORMAL); op3 = expand_expr (arg0, NULL_RTX, V8HImode, EXPAND_NORMAL); op4 = expand_expr (arg1, NULL_RTX, SImode, EXPAND_NORMAL); mode0 = insn_data[icode].operand[0].mode; mode2 = insn_data[icode].operand[2].mode; mode3 = insn_data[icode].operand[3].mode; mode4 = insn_data[icode].operand[4].mode; /* Do some correctness checks for the operands. */ if ((!insn_data[icode].operand[0].predicate (op0, mode0)) || !(UNSIGNED_INT8 (INTVAL (op0)))) error ("operand 4 should be an unsigned 8-bit value (0-255)"); if ((!insn_data[icode].operand[2].predicate (op2, mode2)) || !(UNSIGNED_INT3 (INTVAL (op2)))) error ("operand 3 should be an unsigned 3-bit value (I0-I7)"); if (!insn_data[icode].operand[3].predicate (op3, mode3)) op3 = copy_to_mode_reg (mode3, op3); if ((!insn_data[icode].operand[4].predicate (op4, mode4)) || !(UNSIGNED_INT3 (INTVAL (op4)))) error ("operand 2 should be an unsigned 3-bit value (subreg 0-7)"); else if (icode == CODE_FOR_vst32_n_insn && ((INTVAL (op4) % 2) != 0)) error ("operand 2 should be an even 3-bit value (subreg 0,2,4,6)"); pat = GEN_FCN (icode) (op0, op1, op2, op3, op4); if (!pat) return NULL_RTX; emit_insn (pat); return NULL_RTX; default: break; } /* 2nd part: Expand regular builtins. */ if (icode == 0) internal_error ("bad builtin fcode"); nonvoid = TREE_TYPE (TREE_TYPE (fndecl)) != void_type_node; j = 0; if (nonvoid) { if (target == NULL_RTX || GET_MODE (target) != tmode || !insn_data[icode].operand[0].predicate (target, tmode)) { target = gen_reg_rtx (tmode); } xop[j++] = target; } gcc_assert (n_args <= 4); for (i = 0; i < n_args; i++, j++) { tree arg = CALL_EXPR_ARG (exp, i); machine_mode mode = insn_data[icode].operand[j].mode; rtx op = expand_expr (arg, NULL_RTX, mode, EXPAND_NORMAL); machine_mode opmode = GET_MODE (op); char c = insn_data[icode].operand[j].constraint[0]; /* SIMD extension requires exact immediate operand match. */ if ((id > ARC_BUILTIN_SIMD_BEGIN) && (id < ARC_BUILTIN_SIMD_END) && (c != 'v') && (c != 'r')) { if (!CONST_INT_P (op)) error ("builtin requires an immediate for operand %d", j); switch (c) { case 'L': if (!satisfies_constraint_L (op)) error ("operand %d should be a 6 bit unsigned immediate", j); break; case 'P': if (!satisfies_constraint_P (op)) error ("operand %d should be a 8 bit unsigned immediate", j); break; case 'K': if (!satisfies_constraint_K (op)) error ("operand %d should be a 3 bit unsigned immediate", j); break; default: error ("unknown builtin immediate operand type for operand %d", j); } } if (CONST_INT_P (op)) opmode = mode; if ((opmode == SImode) && (mode == HImode)) { opmode = HImode; op = gen_lowpart (HImode, op); } /* In case the insn wants input operands in modes different from the result, abort. */ gcc_assert (opmode == mode || opmode == VOIDmode); if (!insn_data[icode].operand[i + nonvoid].predicate (op, mode)) op = copy_to_mode_reg (mode, op); xop[j] = op; } pat = apply_GEN_FCN (icode, xop); if (pat == NULL_RTX) return NULL_RTX; emit_insn (pat); if (nonvoid) return target; else return const0_rtx; } /* Returns true if the operands[opno] is a valid compile-time constant to be used as register number in the code for builtins. Else it flags an error and returns false. */ bool check_if_valid_regno_const (rtx *operands, int opno) { switch (GET_CODE (operands[opno])) { case SYMBOL_REF : case CONST : case CONST_INT : return true; default: error ("register number must be a compile-time constant. " "Try giving higher optimization levels"); break; } return false; } /* Return true if it is ok to make a tail-call to DECL. */ static bool arc_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED) { tree attrs = NULL_TREE; /* Never tailcall from an ISR routine - it needs a special exit sequence. */ if (ARC_INTERRUPT_P (arc_compute_function_type (cfun))) return false; if (decl) { attrs = TYPE_ATTRIBUTES (TREE_TYPE (decl)); if (lookup_attribute ("jli_always", attrs)) return false; if (lookup_attribute ("jli_fixed", attrs)) return false; if (lookup_attribute ("secure_call", attrs)) return false; } /* Everything else is ok. */ return true; } /* Output code to add DELTA to the first argument, and then jump to FUNCTION. Used for C++ multiple inheritance. */ static void arc_output_mi_thunk (FILE *file, tree thunk ATTRIBUTE_UNUSED, HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset, tree function) { const char *fnname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (thunk)); int mi_delta = delta; const char *const mi_op = mi_delta < 0 ? "sub" : "add"; int shift = 0; int this_regno = aggregate_value_p (TREE_TYPE (TREE_TYPE (function)), function) ? 1 : 0; rtx fnaddr; assemble_start_function (thunk, fnname); if (mi_delta < 0) mi_delta = - mi_delta; /* Add DELTA. When possible use a plain add, otherwise load it into a register first. */ while (mi_delta != 0) { if ((mi_delta & (3 << shift)) == 0) shift += 2; else { asm_fprintf (file, "\t%s\t%s, %s, %d\n", mi_op, reg_names[this_regno], reg_names[this_regno], mi_delta & (0xff << shift)); mi_delta &= ~(0xff << shift); shift += 8; } } /* If needed, add *(*THIS + VCALL_OFFSET) to THIS. */ if (vcall_offset != 0) { /* ld r12,[this] --> temp = *this add r12,r12,vcall_offset --> temp = *(*this + vcall_offset) ld r12,[r12] add this,this,r12 --> this+ = *(*this + vcall_offset) */ asm_fprintf (file, "\tld\t%s, [%s]\n", ARC_TEMP_SCRATCH_REG, reg_names[this_regno]); asm_fprintf (file, "\tadd\t%s, %s, " HOST_WIDE_INT_PRINT_DEC "\n", ARC_TEMP_SCRATCH_REG, ARC_TEMP_SCRATCH_REG, vcall_offset); asm_fprintf (file, "\tld\t%s, [%s]\n", ARC_TEMP_SCRATCH_REG, ARC_TEMP_SCRATCH_REG); asm_fprintf (file, "\tadd\t%s, %s, %s\n", reg_names[this_regno], reg_names[this_regno], ARC_TEMP_SCRATCH_REG); } fnaddr = XEXP (DECL_RTL (function), 0); if (arc_is_longcall_p (fnaddr)) { if (flag_pic) { asm_fprintf (file, "\tld\t%s, [pcl, @", ARC_TEMP_SCRATCH_REG); assemble_name (file, XSTR (fnaddr, 0)); fputs ("@gotpc]\n", file); asm_fprintf (file, "\tj\t[%s]", ARC_TEMP_SCRATCH_REG); } else { fputs ("\tj\t@", file); assemble_name (file, XSTR (fnaddr, 0)); } } else { fputs ("\tb\t@", file); assemble_name (file, XSTR (fnaddr, 0)); if (flag_pic) fputs ("@plt\n", file); } fputc ('\n', file); assemble_end_function (thunk, fnname); } /* Return true if a 32 bit "long_call" should be generated for this calling SYM_REF. We generate a long_call if the function: a. has an __attribute__((long call)) or b. the -mlong-calls command line switch has been specified However we do not generate a long call if the function has an __attribute__ ((short_call)) or __attribute__ ((medium_call)) This function will be called by C fragments contained in the machine description file. */ bool arc_is_longcall_p (rtx sym_ref) { if (GET_CODE (sym_ref) != SYMBOL_REF) return false; return (SYMBOL_REF_LONG_CALL_P (sym_ref) || (TARGET_LONG_CALLS_SET && !SYMBOL_REF_SHORT_CALL_P (sym_ref) && !SYMBOL_REF_MEDIUM_CALL_P (sym_ref))); } /* Likewise for short calls. */ bool arc_is_shortcall_p (rtx sym_ref) { if (GET_CODE (sym_ref) != SYMBOL_REF) return false; return (SYMBOL_REF_SHORT_CALL_P (sym_ref) || (!TARGET_LONG_CALLS_SET && !TARGET_MEDIUM_CALLS && !SYMBOL_REF_LONG_CALL_P (sym_ref) && !SYMBOL_REF_MEDIUM_CALL_P (sym_ref))); } /* Worker function for TARGET_RETURN_IN_MEMORY. */ static bool arc_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED) { if (AGGREGATE_TYPE_P (type) || TREE_ADDRESSABLE (type)) return true; else { HOST_WIDE_INT size = int_size_in_bytes (type); return (size == -1 || size > (TARGET_V2 ? 16 : 8)); } } static bool arc_pass_by_reference (cumulative_args_t, const function_arg_info &arg) { return (arg.type != 0 && (TREE_CODE (TYPE_SIZE (arg.type)) != INTEGER_CST || TREE_ADDRESSABLE (arg.type))); } /* Implement TARGET_CAN_USE_DOLOOP_P. */ static bool arc_can_use_doloop_p (const widest_int &, const widest_int &iterations_max, unsigned int loop_depth, bool entered_at_top) { /* Considering limitations in the hardware, only use doloop for innermost loops which must be entered from the top. */ if (loop_depth > 1 || !entered_at_top) return false; /* Check for lp_count width boundary. */ if (arc_lpcwidth != 32 && (wi::gtu_p (iterations_max, ((1 << arc_lpcwidth) - 1)) || wi::eq_p (iterations_max, 0))) return false; return true; } /* NULL if INSN insn is valid within a low-overhead loop. Otherwise return why doloop cannot be applied. */ static const char * arc_invalid_within_doloop (const rtx_insn *insn) { if (CALL_P (insn)) return "Function call in the loop."; /* FIXME! add here all the ZOL exceptions. */ return NULL; } /* Return the next active insn, skiping the inline assembly code. */ static rtx_insn * arc_active_insn (rtx_insn *insn) { rtx_insn *nxt = next_active_insn (insn); if (nxt && GET_CODE (PATTERN (nxt)) == ASM_INPUT) nxt = next_active_insn (nxt); return nxt; } /* Search for a sequence made out of two stores and a given number of loads, insert a nop if required. */ static void check_store_cacheline_hazard (void) { rtx_insn *insn, *succ0, *insn1; bool found = false; for (insn = get_insns (); insn; insn = arc_active_insn (insn)) { succ0 = arc_active_insn (insn); if (!succ0) return; if (!single_set (insn) || !single_set (succ0)) continue; if ((get_attr_type (insn) != TYPE_STORE) || (get_attr_type (succ0) != TYPE_STORE)) continue; /* Found at least two consecutive stores. Goto the end of the store sequence. */ for (insn1 = succ0; insn1; insn1 = arc_active_insn (insn1)) if (!single_set (insn1) || get_attr_type (insn1) != TYPE_STORE) break; /* Now, check the next two instructions for the following cases: 1. next instruction is a LD => insert 2 nops between store sequence and load. 2. next-next instruction is a LD => inset 1 nop after the store sequence. */ if (insn1 && single_set (insn1) && (get_attr_type (insn1) == TYPE_LOAD)) { found = true; emit_insn_before (gen_nopv (), insn1); emit_insn_before (gen_nopv (), insn1); } else { if (insn1 && (get_attr_type (insn1) == TYPE_COMPARE)) { /* REG_SAVE_NOTE is used by Haifa scheduler, we are in reorg, so it is safe to reuse it for avoiding the current compare insn to be part of a BRcc optimization. */ add_reg_note (insn1, REG_SAVE_NOTE, GEN_INT (3)); } insn1 = arc_active_insn (insn1); if (insn1 && single_set (insn1) && (get_attr_type (insn1) == TYPE_LOAD)) { found = true; emit_insn_before (gen_nopv (), insn1); } } insn = insn1; if (found) found = false; } } /* Return true if a load instruction (CONSUMER) uses the same address as a store instruction (PRODUCER). This function is used to avoid st/ld address hazard in ARC700 cores. */ static bool arc_store_addr_hazard_internal_p (rtx_insn* producer, rtx_insn* consumer) { rtx in_set, out_set; rtx out_addr, in_addr; if (!producer) return false; if (!consumer) return false; /* Peel the producer and the consumer for the address. */ out_set = single_set (producer); if (out_set) { out_addr = SET_DEST (out_set); if (!out_addr) return false; if (GET_CODE (out_addr) == ZERO_EXTEND || GET_CODE (out_addr) == SIGN_EXTEND) out_addr = XEXP (out_addr, 0); if (!MEM_P (out_addr)) return false; in_set = single_set (consumer); if (in_set) { in_addr = SET_SRC (in_set); if (!in_addr) return false; if (GET_CODE (in_addr) == ZERO_EXTEND || GET_CODE (in_addr) == SIGN_EXTEND) in_addr = XEXP (in_addr, 0); if (!MEM_P (in_addr)) return false; /* Get rid of the MEM and check if the addresses are equivalent. */ in_addr = XEXP (in_addr, 0); out_addr = XEXP (out_addr, 0); return exp_equiv_p (in_addr, out_addr, 0, true); } } return false; } /* Return TRUE is we have an store address hazard. */ bool arc_store_addr_hazard_p (rtx_insn* producer, rtx_insn* consumer) { if (TARGET_ARC700 && (arc_tune != ARC_TUNE_ARC7XX)) return true; return arc_store_addr_hazard_internal_p (producer, consumer); } /* The same functionality as arc_hazard. It is called in machine reorg before any other optimization. Hence, the NOP size is taken into account when doing branch shortening. */ static void workaround_arc_anomaly (void) { rtx_insn *insn, *succ0; rtx_insn *succ1; /* For any architecture: call arc_hazard here. */ for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) { succ0 = next_real_insn (insn); if (arc_hazard (insn, succ0)) { emit_insn_before (gen_nopv (), succ0); } } if (!TARGET_ARC700) return; /* Old A7 are suffering of a cache hazard, and we need to insert two nops between any sequence of stores and a load. */ if (arc_tune != ARC_TUNE_ARC7XX) check_store_cacheline_hazard (); for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) { succ0 = next_real_insn (insn); if (arc_store_addr_hazard_internal_p (insn, succ0)) { emit_insn_after (gen_nopv (), insn); emit_insn_after (gen_nopv (), insn); continue; } /* Avoid adding nops if the instruction between the ST and LD is a call or jump. */ succ1 = next_real_insn (succ0); if (succ0 && !JUMP_P (succ0) && !CALL_P (succ0) && arc_store_addr_hazard_internal_p (insn, succ1)) emit_insn_after (gen_nopv (), insn); } } /* A callback for the hw-doloop pass. Called when a loop we have discovered turns out not to be optimizable; we have to split the loop_end pattern into a subtract and a test. */ static void hwloop_fail (hwloop_info loop) { rtx test; rtx insn = loop->loop_end; if (TARGET_DBNZ && (loop->length && (loop->length <= ARC_MAX_LOOP_LENGTH)) && REG_P (loop->iter_reg)) { /* TARGET_V2 core3 has dbnz instructions. */ test = gen_dbnz (loop->iter_reg, loop->start_label); insn = emit_jump_insn_before (test, loop->loop_end); } else if (REG_P (loop->iter_reg) && (REGNO (loop->iter_reg) == LP_COUNT)) { /* We have the lp_count as loop iterator, try to use it. */ emit_insn_before (gen_loop_fail (), loop->loop_end); test = gen_rtx_NE (VOIDmode, gen_rtx_REG (CC_ZNmode, CC_REG), const0_rtx); test = gen_rtx_IF_THEN_ELSE (VOIDmode, test, gen_rtx_LABEL_REF (Pmode, loop->start_label), pc_rtx); insn = emit_jump_insn_before (gen_rtx_SET (pc_rtx, test), loop->loop_end); } else { emit_insn_before (gen_addsi3 (loop->iter_reg, loop->iter_reg, constm1_rtx), loop->loop_end); test = gen_rtx_NE (VOIDmode, loop->iter_reg, const0_rtx); insn = emit_jump_insn_before (gen_cbranchsi4 (test, loop->iter_reg, const0_rtx, loop->start_label), loop->loop_end); } JUMP_LABEL (insn) = loop->start_label; LABEL_NUSES (loop->start_label)++; delete_insn (loop->loop_end); } /* Return the next insn after INSN that is not a NOTE, but stop the search before we enter another basic block. This routine does not look inside SEQUENCEs. */ static rtx_insn * next_nonnote_insn_bb (rtx_insn *insn) { while (insn) { insn = NEXT_INSN (insn); if (insn == 0 || !NOTE_P (insn)) break; if (NOTE_INSN_BASIC_BLOCK_P (insn)) return NULL; } return insn; } /* Optimize LOOP. */ static bool hwloop_optimize (hwloop_info loop) { int i; edge entry_edge; basic_block entry_bb, bb; rtx iter_reg; rtx_insn *insn, *seq, *entry_after, *last_insn, *end_label; unsigned int length; bool need_fix = false; rtx lp_reg = gen_rtx_REG (SImode, LP_COUNT); if (loop->depth > 1) { if (dump_file) fprintf (dump_file, ";; loop %d is not innermost\n", loop->loop_no); return false; } if (!loop->incoming_dest) { if (dump_file) fprintf (dump_file, ";; loop %d has more than one entry\n", loop->loop_no); return false; } if (loop->incoming_dest != loop->head) { if (dump_file) fprintf (dump_file, ";; loop %d is not entered from head\n", loop->loop_no); return false; } if (loop->has_call || loop->has_asm) { if (dump_file) fprintf (dump_file, ";; loop %d has invalid insn\n", loop->loop_no); return false; } /* Scan all the blocks to make sure they don't use iter_reg. */ if (loop->iter_reg_used || loop->iter_reg_used_outside) { if (dump_file) fprintf (dump_file, ";; loop %d uses iterator\n", loop->loop_no); return false; } /* Check if start_label appears before doloop_end. */ length = 0; for (insn = loop->start_label; insn && insn != loop->loop_end; insn = NEXT_INSN (insn)) { length += NONDEBUG_INSN_P (insn) ? get_attr_length (insn) : 0; if (JUMP_TABLES_IN_TEXT_SECTION && JUMP_TABLE_DATA_P (insn)) { if (dump_file) fprintf (dump_file, ";; loop %d has a jump table\n", loop->loop_no); return false; } } if (!insn) { if (dump_file) fprintf (dump_file, ";; loop %d start_label not before loop_end\n", loop->loop_no); return false; } loop->length = length; if (loop->length > ARC_MAX_LOOP_LENGTH) { if (dump_file) fprintf (dump_file, ";; loop %d too long\n", loop->loop_no); return false; } else if (!loop->length) { if (dump_file) fprintf (dump_file, ";; loop %d is empty\n", loop->loop_no); return false; } /* Check if we use a register or not. */ if (!REG_P (loop->iter_reg)) { if (dump_file) fprintf (dump_file, ";; loop %d iterator is MEM\n", loop->loop_no); return false; } /* Check if we use a register or not. */ if (!REG_P (loop->iter_reg)) { if (dump_file) fprintf (dump_file, ";; loop %d iterator is MEM\n", loop->loop_no); return false; } /* Check if loop register is lpcount. */ if (REG_P (loop->iter_reg) && (REGNO (loop->iter_reg)) != LP_COUNT) { if (dump_file) fprintf (dump_file, ";; loop %d doesn't use lp_count as loop" " iterator\n", loop->loop_no); /* This loop doesn't use the lp_count, check though if we can fix it. */ if (TEST_HARD_REG_BIT (loop->regs_set_in_loop, LP_COUNT) /* In very unique cases we may have LP_COUNT alive. */ || (loop->incoming_src && REGNO_REG_SET_P (df_get_live_out (loop->incoming_src), LP_COUNT))) { if (dump_file) fprintf (dump_file, ";; loop %d, lp_count is alive", loop->loop_no); return false; } else need_fix = true; } /* Check for control like instruction as the last instruction of a ZOL. */ bb = loop->tail; last_insn = PREV_INSN (loop->loop_end); while (1) { for (; last_insn != BB_HEAD (bb); last_insn = PREV_INSN (last_insn)) if (NONDEBUG_INSN_P (last_insn)) break; if (last_insn != BB_HEAD (bb)) break; if (single_pred_p (bb) && single_pred_edge (bb)->flags & EDGE_FALLTHRU && single_pred (bb) != ENTRY_BLOCK_PTR_FOR_FN (cfun)) { bb = single_pred (bb); last_insn = BB_END (bb); continue; } else { last_insn = NULL; break; } } if (!last_insn) { if (dump_file) fprintf (dump_file, ";; loop %d has no last instruction\n", loop->loop_no); return false; } if ((TARGET_ARC600_FAMILY || TARGET_HS) && INSN_P (last_insn) && (JUMP_P (last_insn) || CALL_P (last_insn) || GET_CODE (PATTERN (last_insn)) == SEQUENCE /* At this stage we can have (insn (clobber (mem:BLK (reg)))) instructions, ignore them. */ || (GET_CODE (PATTERN (last_insn)) != CLOBBER && (get_attr_type (last_insn) == TYPE_BRCC || get_attr_type (last_insn) == TYPE_BRCC_NO_DELAY_SLOT)))) { if (loop->length + 2 > ARC_MAX_LOOP_LENGTH) { if (dump_file) fprintf (dump_file, ";; loop %d too long\n", loop->loop_no); return false; } if (dump_file) fprintf (dump_file, ";; loop %d has a control like last insn; " "add a nop\n", loop->loop_no); last_insn = emit_insn_after (gen_nopv (), last_insn); } if (LABEL_P (last_insn)) { if (dump_file) fprintf (dump_file, ";; loop %d has a label as last insn; " "add a nop\n", loop->loop_no); last_insn = emit_insn_after (gen_nopv (), last_insn); } /* SAVE_NOTE is used by haifa scheduler. However, we are after it and we can use it to indicate the last ZOL instruction cannot be part of a delay slot. */ add_reg_note (last_insn, REG_SAVE_NOTE, GEN_INT (2)); loop->last_insn = last_insn; /* Get the loop iteration register. */ iter_reg = loop->iter_reg; gcc_assert (REG_P (iter_reg)); entry_edge = NULL; FOR_EACH_VEC_SAFE_ELT (loop->incoming, i, entry_edge) if (entry_edge->flags & EDGE_FALLTHRU) break; if (entry_edge == NULL) { if (dump_file) fprintf (dump_file, ";; loop %d has no fallthru edge jumping " "into the loop\n", loop->loop_no); return false; } /* The loop is good. */ end_label = gen_label_rtx (); loop->end_label = end_label; /* Place the zero_cost_loop_start instruction before the loop. */ entry_bb = entry_edge->src; start_sequence (); if (need_fix) { /* The loop uses a R-register, but the lp_count is free, thus use lp_count. */ emit_insn (gen_rtx_SET (lp_reg, iter_reg)); SET_HARD_REG_BIT (loop->regs_set_in_loop, LP_COUNT); iter_reg = lp_reg; if (dump_file) { fprintf (dump_file, ";; fix loop %d to use lp_count\n", loop->loop_no); } } insn = emit_insn (gen_arc_lp (loop->start_label, loop->end_label)); seq = get_insns (); end_sequence (); entry_after = BB_END (entry_bb); if (!single_succ_p (entry_bb) || vec_safe_length (loop->incoming) > 1 || !entry_after) { basic_block new_bb; edge e; edge_iterator ei; emit_insn_before (seq, BB_HEAD (loop->head)); seq = emit_label_before (gen_label_rtx (), seq); new_bb = create_basic_block (seq, insn, entry_bb); FOR_EACH_EDGE (e, ei, loop->incoming) { if (!(e->flags & EDGE_FALLTHRU)) redirect_edge_and_branch_force (e, new_bb); else redirect_edge_succ (e, new_bb); } make_edge (new_bb, loop->head, 0); } else { #if 0 while (DEBUG_INSN_P (entry_after) || (NOTE_P (entry_after) && NOTE_KIND (entry_after) != NOTE_INSN_BASIC_BLOCK /* Make sure we don't split a call and its corresponding CALL_ARG_LOCATION note. */ && NOTE_KIND (entry_after) != NOTE_INSN_CALL_ARG_LOCATION)) entry_after = NEXT_INSN (entry_after); #endif entry_after = next_nonnote_insn_bb (entry_after); gcc_assert (entry_after); emit_insn_before (seq, entry_after); } /* Insert the loop end label before the last instruction of the loop. */ emit_label_after (end_label, loop->last_insn); /* Make sure we mark the begining and end label as used. */ LABEL_NUSES (loop->end_label)++; LABEL_NUSES (loop->start_label)++; return true; } /* A callback for the hw-doloop pass. This function examines INSN; if it is a loop_end pattern we recognize, return the reg rtx for the loop counter. Otherwise, return NULL_RTX. */ static rtx hwloop_pattern_reg (rtx_insn *insn) { rtx reg; if (!JUMP_P (insn) || recog_memoized (insn) != CODE_FOR_loop_end) return NULL_RTX; reg = SET_DEST (XVECEXP (PATTERN (insn), 0, 1)); if (!REG_P (reg)) return NULL_RTX; return reg; } static struct hw_doloop_hooks arc_doloop_hooks = { hwloop_pattern_reg, hwloop_optimize, hwloop_fail }; /* Run from machine_dependent_reorg, this pass looks for doloop_end insns and tries to rewrite the RTL of these loops so that proper Blackfin hardware loops are generated. */ static void arc_reorg_loops (void) { reorg_loops (true, &arc_doloop_hooks); } /* Scan all calls and add symbols to be emitted in the jli section if needed. */ static void jli_call_scan (void) { rtx_insn *insn; for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) { if (!CALL_P (insn)) continue; rtx pat = PATTERN (insn); if (GET_CODE (pat) == COND_EXEC) pat = COND_EXEC_CODE (pat); pat = XVECEXP (pat, 0, 0); if (GET_CODE (pat) == SET) pat = SET_SRC (pat); pat = XEXP (XEXP (pat, 0), 0); if (GET_CODE (pat) == SYMBOL_REF && arc_is_jli_call_p (pat)) arc_add_jli_section (pat); } } /* Add padding if necessary to avoid a mispredict. A return could happen immediately after the function start. A call/return and return/return must be 6 bytes apart to avoid mispredict. */ static void pad_return (void) { rtx_insn *insn; long offset; if (!TARGET_PAD_RETURN) return; for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) { rtx_insn *prev0 = prev_active_insn (insn); bool wantlong = false; if (!INSN_P (insn) || GET_CODE (PATTERN (insn)) != SIMPLE_RETURN) continue; if (!prev0) { prev0 = emit_insn_before (gen_nopv (), insn); /* REG_SAVE_NOTE is used by Haifa scheduler, we are in reorg so it is safe to reuse it for forcing a particular length for an instruction. */ add_reg_note (prev0, REG_SAVE_NOTE, GEN_INT (1)); emit_insn_before (gen_nopv (), insn); continue; } offset = get_attr_length (prev0); if (get_attr_length (prev0) == 2 && get_attr_iscompact (prev0) != ISCOMPACT_TRUE) { /* Force long version of the insn. */ wantlong = true; offset += 2; } rtx_insn *prev = prev_active_insn (prev0); if (prev) offset += get_attr_length (prev); prev = prev_active_insn (prev); if (prev) offset += get_attr_length (prev); switch (offset) { case 2: prev = emit_insn_before (gen_nopv (), insn); add_reg_note (prev, REG_SAVE_NOTE, GEN_INT (1)); break; case 4: emit_insn_before (gen_nopv (), insn); break; default: continue; } if (wantlong) add_reg_note (prev0, REG_SAVE_NOTE, GEN_INT (1)); /* Emit a blockage to avoid delay slot scheduling. */ emit_insn_before (gen_blockage (), insn); } } static int arc_reorg_in_progress = 0; /* ARC's machince specific reorg function. */ static void arc_reorg (void) { rtx_insn *insn; rtx pattern; rtx pc_target; long offset; int changed; cfun->machine->arc_reorg_started = 1; arc_reorg_in_progress = 1; compute_bb_for_insn (); df_analyze (); /* Doloop optimization. */ arc_reorg_loops (); workaround_arc_anomaly (); jli_call_scan (); pad_return (); /* FIXME: should anticipate ccfsm action, generate special patterns for to-be-deleted branches that have no delay slot and have at least the length of the size increase forced on other insns that are conditionalized. This can also have an insn_list inside that enumerates insns which are not actually conditionalized because the destinations are dead in the not-execute case. Could also tag branches that we want to be unaligned if they get no delay slot, or even ones that we don't want to do delay slot sheduling for because we can unalign them. However, there are cases when conditional execution is only possible after delay slot scheduling: - If a delay slot is filled with a nocond/set insn from above, the previous basic block can become elegible for conditional execution. - If a delay slot is filled with a nocond insn from the fall-through path, the branch with that delay slot can become eligble for conditional execution (however, with the same sort of data flow analysis that dbr does, we could have figured out before that we don't need to conditionalize this insn.) - If a delay slot insn is filled with an insn from the target, the target label gets its uses decremented (even deleted if falling to zero), thus possibly creating more condexec opportunities there. Therefore, we should still be prepared to apply condexec optimization on non-prepared branches if the size increase of conditionalized insns is no more than the size saved from eliminating the branch. An invocation option could also be used to reserve a bit of extra size for condbranches so that this'll work more often (could also test in arc_reorg if the block is 'close enough' to be eligible for condexec to make this likely, and estimate required size increase). */ /* Generate BRcc insns, by combining cmp and Bcc insns wherever possible. */ if (TARGET_NO_BRCC_SET) return; do { init_insn_lengths(); changed = 0; if (optimize > 1 && !TARGET_NO_COND_EXEC) { arc_ifcvt (); unsigned int flags = pass_data_arc_ifcvt.todo_flags_finish; df_finish_pass ((flags & TODO_df_verify) != 0); if (dump_file) { fprintf (dump_file, ";; After if conversion:\n\n"); print_rtl (dump_file, get_insns ()); } } /* Call shorten_branches to calculate the insn lengths. */ shorten_branches (get_insns()); cfun->machine->ccfsm_current_insn = NULL_RTX; if (!INSN_ADDRESSES_SET_P()) fatal_error (input_location, "insn addresses not set after shorten_branches"); for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) { rtx label; enum attr_type insn_type; /* If a non-jump insn (or a casesi jump table), continue. */ if (GET_CODE (insn) != JUMP_INSN || GET_CODE (PATTERN (insn)) == ADDR_VEC || GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC) continue; /* If we already have a brcc, note if it is suitable for brcc_s. Be a bit generous with the brcc_s range so that we can take advantage of any code shortening from delay slot scheduling. */ if (recog_memoized (insn) == CODE_FOR_cbranchsi4_scratch) { rtx pat = PATTERN (insn); rtx op = XEXP (SET_SRC (XVECEXP (pat, 0, 0)), 0); rtx *ccp = &XEXP (XVECEXP (pat, 0, 1), 0); offset = branch_dest (insn) - INSN_ADDRESSES (INSN_UID (insn)); if ((offset >= -140 && offset < 140) && rtx_equal_p (XEXP (op, 1), const0_rtx) && compact_register_operand (XEXP (op, 0), VOIDmode) && equality_comparison_operator (op, VOIDmode)) PUT_MODE (*ccp, CC_Zmode); else if (GET_MODE (*ccp) == CC_Zmode) PUT_MODE (*ccp, CC_ZNmode); continue; } if ((insn_type = get_attr_type (insn)) == TYPE_BRCC || insn_type == TYPE_BRCC_NO_DELAY_SLOT) continue; /* OK. so we have a jump insn. */ /* We need to check that it is a bcc. */ /* Bcc => set (pc) (if_then_else ) */ pattern = PATTERN (insn); if (GET_CODE (pattern) != SET || GET_CODE (SET_SRC (pattern)) != IF_THEN_ELSE || ANY_RETURN_P (XEXP (SET_SRC (pattern), 1))) continue; /* Now check if the jump is beyond the s9 range. */ if (CROSSING_JUMP_P (insn)) continue; offset = branch_dest (insn) - INSN_ADDRESSES (INSN_UID (insn)); if(offset > 253 || offset < -254) continue; pc_target = SET_SRC (pattern); /* Avoid FPU instructions. */ if ((GET_MODE (XEXP (XEXP (pc_target, 0), 0)) == CC_FPUmode) || (GET_MODE (XEXP (XEXP (pc_target, 0), 0)) == CC_FPUEmode) || (GET_MODE (XEXP (XEXP (pc_target, 0), 0)) == CC_FPU_UNEQmode)) continue; /* Now go back and search for the set cc insn. */ label = XEXP (pc_target, 1); { rtx pat; rtx_insn *scan, *link_insn = NULL; for (scan = PREV_INSN (insn); scan && GET_CODE (scan) != CODE_LABEL; scan = PREV_INSN (scan)) { if (! INSN_P (scan)) continue; pat = PATTERN (scan); if (GET_CODE (pat) == SET && cc_register (SET_DEST (pat), VOIDmode)) { link_insn = scan; break; } } if (!link_insn) continue; else { /* Check if this is a data dependency. */ rtx op, cc_clob_rtx, op0, op1, brcc_insn, note; rtx cmp0, cmp1; /* Make sure we can use it for brcc insns. */ if (find_reg_note (link_insn, REG_SAVE_NOTE, GEN_INT (3))) continue; /* Ok this is the set cc. copy args here. */ op = XEXP (pc_target, 0); op0 = cmp0 = XEXP (SET_SRC (pat), 0); op1 = cmp1 = XEXP (SET_SRC (pat), 1); if (GET_CODE (op0) == ZERO_EXTRACT && XEXP (op0, 1) == const1_rtx && (GET_CODE (op) == EQ || GET_CODE (op) == NE)) { /* btst / b{eq,ne} -> bbit{0,1} */ op0 = XEXP (cmp0, 0); op1 = XEXP (cmp0, 2); } else if (!register_operand (op0, VOIDmode) || !general_operand (op1, VOIDmode)) continue; /* Be careful not to break what cmpsfpx_raw is trying to create for checking equality of single-precision floats. */ else if (TARGET_SPFP && GET_MODE (op0) == SFmode && GET_MODE (op1) == SFmode) continue; /* None of the two cmp operands should be set between the cmp and the branch. */ if (reg_set_between_p (op0, link_insn, insn)) continue; if (reg_set_between_p (op1, link_insn, insn)) continue; /* Since the MODE check does not work, check that this is CC reg's last set location before insn, and also no instruction between the cmp and branch uses the condition codes. */ if ((reg_set_between_p (SET_DEST (pat), link_insn, insn)) || (reg_used_between_p (SET_DEST (pat), link_insn, insn))) continue; /* CC reg should be dead after insn. */ if (!find_regno_note (insn, REG_DEAD, CC_REG)) continue; op = gen_rtx_fmt_ee (GET_CODE (op), GET_MODE (op), cmp0, cmp1); /* If we create a LIMM where there was none before, we only benefit if we can avoid a scheduling bubble for the ARC600. Otherwise, we'd only forgo chances at short insn generation, and risk out-of-range branches. */ if (!brcc_nolimm_operator (op, VOIDmode) && !long_immediate_operand (op1, VOIDmode) && (TARGET_ARC700 || next_active_insn (link_insn) != insn)) continue; /* Emit bbit / brcc (or brcc_s if possible). CC_Zmode indicates that brcc_s is possible. */ if (op0 != cmp0) cc_clob_rtx = gen_rtx_REG (CC_ZNmode, CC_REG); else if ((offset >= -140 && offset < 140) && rtx_equal_p (op1, const0_rtx) && compact_register_operand (op0, VOIDmode) && (GET_CODE (op) == EQ || GET_CODE (op) == NE)) cc_clob_rtx = gen_rtx_REG (CC_Zmode, CC_REG); else cc_clob_rtx = gen_rtx_REG (CCmode, CC_REG); brcc_insn = gen_rtx_IF_THEN_ELSE (VOIDmode, op, label, pc_rtx); brcc_insn = gen_rtx_SET (pc_rtx, brcc_insn); cc_clob_rtx = gen_rtx_CLOBBER (VOIDmode, cc_clob_rtx); brcc_insn = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (2, brcc_insn, cc_clob_rtx)); brcc_insn = emit_jump_insn_before (brcc_insn, insn); JUMP_LABEL (brcc_insn) = JUMP_LABEL (insn); note = find_reg_note (insn, REG_BR_PROB, 0); if (note) { XEXP (note, 1) = REG_NOTES (brcc_insn); REG_NOTES (brcc_insn) = note; } note = find_reg_note (link_insn, REG_DEAD, op0); if (note) { remove_note (link_insn, note); XEXP (note, 1) = REG_NOTES (brcc_insn); REG_NOTES (brcc_insn) = note; } note = find_reg_note (link_insn, REG_DEAD, op1); if (note) { XEXP (note, 1) = REG_NOTES (brcc_insn); REG_NOTES (brcc_insn) = note; } changed = 1; /* Delete the bcc insn. */ set_insn_deleted (insn); /* Delete the cmp insn. */ set_insn_deleted (link_insn); } } } /* Clear out insn_addresses. */ INSN_ADDRESSES_FREE (); } while (changed); if (INSN_ADDRESSES_SET_P()) fatal_error (input_location, "insn addresses not freed"); arc_reorg_in_progress = 0; } /* Check if the operands are valid for BRcc.d generation Valid Brcc.d patterns are Brcc.d b, c, s9 Brcc.d b, u6, s9 For cc={GT, LE, GTU, LEU}, u6=63 cannot be allowed, since they are encoded by the assembler as {GE, LT, HS, LS} 64, which does not have a delay slot Assumed precondition: Second operand is either a register or a u6 value. */ bool valid_brcc_with_delay_p (rtx *operands) { if (optimize_size && GET_MODE (operands[4]) == CC_Zmode) return false; return brcc_nolimm_operator (operands[0], VOIDmode); } /* Implement TARGET_IN_SMALL_DATA_P. Return true if it would be safe to access DECL using %gp_rel(...)($gp). */ static bool arc_in_small_data_p (const_tree decl) { HOST_WIDE_INT size; tree attr; /* Only variables are going into small data area. */ if (TREE_CODE (decl) != VAR_DECL) return false; if (TARGET_NO_SDATA_SET) return false; /* Disable sdata references to weak variables. */ if (DECL_WEAK (decl)) return false; /* Don't put constants into the small data section: we want them to be in ROM rather than RAM. */ if (TREE_READONLY (decl)) return false; /* To ensure -mvolatile-cache works ld.di does not have a gp-relative variant. */ if (!TARGET_VOLATILE_CACHE_SET && TREE_THIS_VOLATILE (decl)) return false; /* Likewise for uncached data. */ attr = TYPE_ATTRIBUTES (TREE_TYPE (decl)); if (lookup_attribute ("uncached", attr)) return false; /* and for aux regs. */ attr = DECL_ATTRIBUTES (decl); if (lookup_attribute ("aux", attr)) return false; if (DECL_SECTION_NAME (decl) != 0) { const char *name = DECL_SECTION_NAME (decl); if (strcmp (name, ".sdata") == 0 || strcmp (name, ".sbss") == 0) return true; } /* If it's not public, there's no need to put it in the small data section. */ else if (TREE_PUBLIC (decl)) { size = int_size_in_bytes (TREE_TYPE (decl)); return (size > 0 && size <= g_switch_value); } return false; } /* Return true if OP is an acceptable memory operand for ARCompact 16-bit gp-relative load instructions. */ /* volatile cache option still to be handled. */ bool compact_sda_memory_operand (rtx op, machine_mode mode, bool short_p) { rtx addr; int size; int align = 0; int mask = 0; /* Eliminate non-memory operations. */ if (GET_CODE (op) != MEM) return false; if (mode == VOIDmode) mode = GET_MODE (op); size = GET_MODE_SIZE (mode); /* dword operations really put out 2 instructions, so eliminate them. */ if (size > UNITS_PER_WORD) return false; /* Decode the address now. */ addr = XEXP (op, 0); if (!legitimate_small_data_address_p (addr, mode)) return false; if (!short_p || size == 1) return true; /* Now check for the alignment, the short loads using gp require the addresses to be aligned. */ align = get_symbol_alignment (addr); switch (mode) { case E_HImode: mask = 1; break; default: mask = 3; break; } if (align && ((align & mask) == 0)) return true; return false; } /* Return TRUE if PAT is accessing an aux-reg. */ static bool arc_is_aux_reg_p (rtx pat) { tree attrs = NULL_TREE; tree addr; if (!MEM_P (pat)) return false; /* Get the memory attributes. */ addr = MEM_EXPR (pat); if (!addr) return false; /* Get the attributes. */ if (TREE_CODE (addr) == VAR_DECL) attrs = DECL_ATTRIBUTES (addr); else if (TREE_CODE (addr) == MEM_REF) attrs = TYPE_ATTRIBUTES (TREE_TYPE (TREE_OPERAND (addr, 0))); else return false; if (lookup_attribute ("aux", attrs)) return true; return false; } /* Implement ASM_OUTPUT_ALIGNED_DECL_LOCAL. */ void arc_asm_output_aligned_decl_local (FILE * stream, tree decl, const char * name, unsigned HOST_WIDE_INT size, unsigned HOST_WIDE_INT align, unsigned HOST_WIDE_INT globalize_p) { int in_small_data = arc_in_small_data_p (decl); rtx mem = decl == NULL_TREE ? NULL_RTX : DECL_RTL (decl); /* Don't output aux-reg symbols. */ if (mem != NULL_RTX && MEM_P (mem) && SYMBOL_REF_P (XEXP (mem, 0)) && arc_is_aux_reg_p (mem)) return; if (in_small_data) switch_to_section (get_named_section (NULL, ".sbss", 0)); /* named_section (0,".sbss",0); */ else switch_to_section (bss_section); if (globalize_p) (*targetm.asm_out.globalize_label) (stream, name); ASM_OUTPUT_ALIGN (stream, floor_log2 ((align) / BITS_PER_UNIT)); ASM_OUTPUT_TYPE_DIRECTIVE (stream, name, "object"); ASM_OUTPUT_SIZE_DIRECTIVE (stream, name, size); ASM_OUTPUT_LABEL (stream, name); if (size != 0) ASM_OUTPUT_SKIP (stream, size); } static bool arc_preserve_reload_p (rtx in) { return (GET_CODE (in) == PLUS && RTX_OK_FOR_BASE_P (XEXP (in, 0), true) && CONST_INT_P (XEXP (in, 1)) && !((INTVAL (XEXP (in, 1)) & 511))); } /* Implement TARGET_REGISTER_MOVE_COST. */ static int arc_register_move_cost (machine_mode, reg_class_t from_class, reg_class_t to_class) { /* Force an attempt to 'mov Dy,Dx' to spill. */ if ((TARGET_ARC700 || TARGET_EM) && TARGET_DPFP && from_class == DOUBLE_REGS && to_class == DOUBLE_REGS) return 100; return 2; } /* Emit code for an addsi3 instruction with OPERANDS. COND_P indicates if this will use conditional execution. Return the length of the instruction. If OUTPUT_P is false, don't actually output the instruction, just return its length. */ int arc_output_addsi (rtx *operands, bool cond_p, bool output_p) { char format[35]; int match = operands_match_p (operands[0], operands[1]); int match2 = operands_match_p (operands[0], operands[2]); int intval = (REG_P (operands[2]) ? 1 : CONST_INT_P (operands[2]) ? INTVAL (operands[2]) : 0xbadc057); int neg_intval = -intval; int short_0 = satisfies_constraint_Rcq (operands[0]); int short_p = (!cond_p && short_0 && satisfies_constraint_Rcq (operands[1])); int ret = 0; #define REG_H_P(OP) (REG_P (OP) && ((TARGET_V2 && REGNO (OP) <= 31 \ && REGNO (OP) != 30) \ || !TARGET_V2)) #define ADDSI_OUTPUT1(FORMAT) do {\ if (output_p) \ output_asm_insn (FORMAT, operands);\ return ret; \ } while (0) #define ADDSI_OUTPUT(LIST) do {\ if (output_p) \ sprintf LIST;\ ADDSI_OUTPUT1 (format);\ return ret; \ } while (0) /* First try to emit a 16 bit insn. */ ret = 2; if (!cond_p /* If we are actually about to output this insn, don't try a 16 bit variant if we already decided that we don't want that (I.e. we upsized this insn to align some following insn.) E.g. add_s r0,sp,70 is 16 bit, but add r0,sp,70 requires a LIMM - but add1 r0,sp,35 doesn't. */ && (!output_p || (get_attr_length (current_output_insn) & 2))) { /* Generate add_s a,b,c; add_s b,b,u7; add_s c,b,u3; add_s b,b,h patterns. */ if (short_p && ((REG_H_P (operands[2]) && (match || satisfies_constraint_Rcq (operands[2]))) || (CONST_INT_P (operands[2]) && ((unsigned) intval <= (match ? 127 : 7))))) ADDSI_OUTPUT1 ("add%? %0,%1,%2 ;1"); /* Generate add_s b,b,h patterns. */ if (short_0 && match2 && REG_H_P (operands[1])) ADDSI_OUTPUT1 ("add%? %0,%2,%1 ;2"); /* Generate add_s b,sp,u7; add_s sp,sp,u7 patterns. */ if ((short_0 || REGNO (operands[0]) == STACK_POINTER_REGNUM) && REGNO (operands[1]) == STACK_POINTER_REGNUM && !(intval & ~124)) ADDSI_OUTPUT1 ("add%? %0,%1,%2 ;3"); if ((short_p && (unsigned) neg_intval <= (match ? 31 : 7)) || (REGNO (operands[0]) == STACK_POINTER_REGNUM && match && !(neg_intval & ~124))) ADDSI_OUTPUT1 ("sub%? %0,%1,%n2 ;4"); /* Generate add_s h,h,s3 patterns. */ if (REG_H_P (operands[0]) && match && TARGET_V2 && CONST_INT_P (operands[2]) && ((intval>= -1) && (intval <= 6))) ADDSI_OUTPUT1 ("add%? %0,%1,%2 ;5"); /* Generate add_s r0,b,u6; add_s r1,b,u6 patterns. */ if (TARGET_CODE_DENSITY && REG_P (operands[0]) && REG_P (operands[1]) && ((REGNO (operands[0]) == 0) || (REGNO (operands[0]) == 1)) && satisfies_constraint_Rcq (operands[1]) && satisfies_constraint_L (operands[2])) ADDSI_OUTPUT1 ("add%? %0,%1,%2 ;6"); } /* Now try to emit a 32 bit insn without long immediate. */ ret = 4; if (!match && match2 && REG_P (operands[1])) ADDSI_OUTPUT1 ("add%? %0,%2,%1"); if (match || !cond_p) { int limit = (match && !cond_p) ? 0x7ff : 0x3f; int range_factor = neg_intval & intval; int shift; if (intval == (HOST_WIDE_INT) (HOST_WIDE_INT_M1U << 31)) ADDSI_OUTPUT1 ("bxor%? %0,%1,31"); /* If we can use a straight add / sub instead of a {add,sub}[123] of same size, do, so - the insn latency is lower. */ /* -0x800 is a 12-bit constant for add /add3 / sub / sub3, but 0x800 is not. */ if ((intval >= 0 && intval <= limit) || (intval == -0x800 && limit == 0x7ff)) ADDSI_OUTPUT1 ("add%? %0,%1,%2"); else if ((intval < 0 && neg_intval <= limit) || (intval == 0x800 && limit == 0x7ff)) ADDSI_OUTPUT1 ("sub%? %0,%1,%n2"); shift = range_factor >= 8 ? 3 : (range_factor >> 1); gcc_assert (shift == 0 || shift == 1 || shift == 2 || shift == 3); gcc_assert ((((1 << shift) - 1) & intval) == 0); if (((intval < 0 && intval != -0x4000) /* sub[123] is slower than add_s / sub, only use it if it avoids a long immediate. */ && neg_intval <= limit << shift) || (intval == 0x4000 && limit == 0x7ff)) ADDSI_OUTPUT ((format, "sub%d%%? %%0,%%1,%d", shift, neg_intval >> shift)); else if ((intval >= 0 && intval <= limit << shift) || (intval == -0x4000 && limit == 0x7ff)) ADDSI_OUTPUT ((format, "add%d%%? %%0,%%1,%d", shift, intval >> shift)); } /* Try to emit a 16 bit opcode with long immediate. */ ret = 6; if (short_p && match) ADDSI_OUTPUT1 ("add%? %0,%1,%2"); /* We have to use a 32 bit opcode, and with a long immediate. */ ret = 8; ADDSI_OUTPUT1 (intval < 0 ? "sub%? %0,%1,%n2" : "add%? %0,%1,%2"); } /* Emit code for an commutative_cond_exec instruction with OPERANDS. Return the length of the instruction. If OUTPUT_P is false, don't actually output the instruction, just return its length. */ int arc_output_commutative_cond_exec (rtx *operands, bool output_p) { enum rtx_code commutative_op = GET_CODE (operands[3]); const char *pat = NULL; /* Canonical rtl should not have a constant in the first operand position. */ gcc_assert (!CONSTANT_P (operands[1])); switch (commutative_op) { case AND: if (satisfies_constraint_C1p (operands[2])) pat = "bmsk%? %0,%1,%Z2"; else if (satisfies_constraint_C2p (operands[2])) { operands[2] = GEN_INT ((~INTVAL (operands[2]))); pat = "bmskn%? %0,%1,%Z2"; } else if (satisfies_constraint_Ccp (operands[2])) pat = "bclr%? %0,%1,%M2"; else if (satisfies_constraint_CnL (operands[2])) pat = "bic%? %0,%1,%n2-1"; break; case IOR: if (satisfies_constraint_C0p (operands[2])) pat = "bset%? %0,%1,%z2"; break; case XOR: if (satisfies_constraint_C0p (operands[2])) pat = "bxor%? %0,%1,%z2"; break; case PLUS: return arc_output_addsi (operands, true, output_p); default: break; } if (output_p) output_asm_insn (pat ? pat : "%O3.%d5 %0,%1,%2", operands); if (pat || REG_P (operands[2]) || satisfies_constraint_L (operands[2])) return 4; return 8; } /* Helper function of arc_expand_cpymem. ADDR points to a chunk of memory. Emit code and return an potentially modified address such that offsets up to SIZE are can be added to yield a legitimate address. if REUSE is set, ADDR is a register that may be modified. */ static rtx force_offsettable (rtx addr, HOST_WIDE_INT size, bool reuse) { rtx base = addr; rtx offs = const0_rtx; if (GET_CODE (base) == PLUS) { offs = XEXP (base, 1); base = XEXP (base, 0); } if (!REG_P (base) || (REGNO (base) != STACK_POINTER_REGNUM && REGNO_PTR_FRAME_P (REGNO (base))) || !CONST_INT_P (offs) || !SMALL_INT (INTVAL (offs)) || !SMALL_INT (INTVAL (offs) + size)) { if (reuse) emit_insn (gen_add2_insn (addr, offs)); else addr = copy_to_mode_reg (Pmode, addr); } return addr; } /* Like move_by_pieces, but take account of load latency, and actual offset ranges. Return true on success. */ bool arc_expand_cpymem (rtx *operands) { rtx dst = operands[0]; rtx src = operands[1]; rtx dst_addr, src_addr; HOST_WIDE_INT size; int align = INTVAL (operands[3]); unsigned n_pieces; int piece = align; rtx store[2]; rtx tmpx[2]; int i; if (!CONST_INT_P (operands[2])) return false; size = INTVAL (operands[2]); /* move_by_pieces_ninsns is static, so we can't use it. */ if (align >= 4) { if (TARGET_LL64) n_pieces = (size + 4) / 8U + ((size >> 1) & 1) + (size & 1); else n_pieces = (size + 2) / 4U + (size & 1); } else if (align == 2) n_pieces = (size + 1) / 2U; else n_pieces = size; if (n_pieces >= (unsigned int) (optimize_size ? 3 : 15)) return false; /* Force 32 bit aligned and larger datum to use 64 bit transfers, if possible. */ if (TARGET_LL64 && (piece >= 4) && (size >= 8)) piece = 8; else if (piece > 4) piece = 4; dst_addr = force_offsettable (XEXP (operands[0], 0), size, 0); src_addr = force_offsettable (XEXP (operands[1], 0), size, 0); store[0] = store[1] = NULL_RTX; tmpx[0] = tmpx[1] = NULL_RTX; for (i = 0; size > 0; i ^= 1, size -= piece) { rtx tmp; machine_mode mode; while (piece > size) piece >>= 1; mode = smallest_int_mode_for_size (piece * BITS_PER_UNIT); /* If we don't re-use temporaries, the scheduler gets carried away, and the register pressure gets unnecessarily high. */ if (0 && tmpx[i] && GET_MODE (tmpx[i]) == mode) tmp = tmpx[i]; else tmpx[i] = tmp = gen_reg_rtx (mode); dst_addr = force_offsettable (dst_addr, piece, 1); src_addr = force_offsettable (src_addr, piece, 1); if (store[i]) emit_insn (store[i]); emit_move_insn (tmp, change_address (src, mode, src_addr)); store[i] = gen_move_insn (change_address (dst, mode, dst_addr), tmp); dst_addr = plus_constant (Pmode, dst_addr, piece); src_addr = plus_constant (Pmode, src_addr, piece); } if (store[i]) emit_insn (store[i]); if (store[i^1]) emit_insn (store[i^1]); return true; } static bool arc_get_aux_arg (rtx pat, int *auxr) { tree attr, addr = MEM_EXPR (pat); if (TREE_CODE (addr) != VAR_DECL) return false; attr = DECL_ATTRIBUTES (addr); if (lookup_attribute ("aux", attr)) { tree arg = TREE_VALUE (attr); if (arg) { *auxr = TREE_INT_CST_LOW (TREE_VALUE (arg)); return true; } } return false; } /* Prepare operands for move in MODE. Return true iff the move has been emitted. */ bool prepare_move_operands (rtx *operands, machine_mode mode) { if ((MEM_P (operands[0]) || MEM_P (operands[1])) && SCALAR_INT_MODE_P (mode)) { /* First handle aux attribute. */ if (mode == SImode) { rtx tmp; int auxr = 0; if (MEM_P (operands[0]) && arc_is_aux_reg_p (operands[0])) { /* Save operation. */ if (arc_get_aux_arg (operands[0], &auxr)) { tmp = gen_reg_rtx (SImode); emit_move_insn (tmp, GEN_INT (auxr)); } else tmp = XEXP (operands[0], 0); operands[1] = force_reg (SImode, operands[1]); emit_insn (gen_rtx_UNSPEC_VOLATILE (VOIDmode, gen_rtvec (2, operands[1], tmp), VUNSPEC_ARC_SR)); return true; } if (MEM_P (operands[1]) && arc_is_aux_reg_p (operands[1])) { if (arc_get_aux_arg (operands[1], &auxr)) { tmp = gen_reg_rtx (SImode); emit_move_insn (tmp, GEN_INT (auxr)); } else { tmp = XEXP (operands[1], 0); gcc_assert (GET_CODE (tmp) == SYMBOL_REF); } /* Load operation. */ gcc_assert (REG_P (operands[0])); emit_insn (gen_rtx_SET (operands[0], gen_rtx_UNSPEC_VOLATILE (SImode, gen_rtvec (1, tmp), VUNSPEC_ARC_LR))); return true; } } /* Second, we check for the uncached. */ if (arc_is_uncached_mem_p (operands[0])) { if (!REG_P (operands[1])) operands[1] = force_reg (mode, operands[1]); emit_insn (gen_rtx_UNSPEC_VOLATILE (VOIDmode, gen_rtvec (2, operands[0], operands[1]), VUNSPEC_ARC_STDI)); return true; } if (arc_is_uncached_mem_p (operands[1])) { if (MEM_P (operands[0])) operands[0] = force_reg (mode, operands[0]); emit_insn (gen_rtx_SET (operands[0], gen_rtx_UNSPEC_VOLATILE (mode, gen_rtvec (1, operands[1]), VUNSPEC_ARC_LDDI))); return true; } } if (GET_CODE (operands[1]) == SYMBOL_REF) { enum tls_model model = SYMBOL_REF_TLS_MODEL (operands[1]); if (MEM_P (operands[0])) operands[1] = force_reg (mode, operands[1]); else if (model) operands[1] = arc_legitimize_tls_address (operands[1], model); } operands[1] = arc_legitimize_pic_address (operands[1]); /* Store instructions are limited, they only accept as address an immediate, a register or a register plus a small immediate. */ if (MEM_P (operands[0]) && !move_dest_operand (operands[0], mode)) { rtx tmp0 = copy_to_mode_reg (Pmode, XEXP (operands[0], 0)); rtx tmp1 = change_address (operands[0], mode, tmp0); MEM_COPY_ATTRIBUTES (tmp1, operands[0]); operands[0] = tmp1; } /* Check if it is constant but it is not legitimized. */ if (CONSTANT_P (operands[1]) && !arc_legitimate_constant_p (mode, operands[1])) operands[1] = force_reg (mode, XEXP (operands[1], 0)); else if (MEM_P (operands[0]) && ((CONSTANT_P (operands[1]) && !satisfies_constraint_Cm3 (operands[1])) || MEM_P (operands[1]))) operands[1] = force_reg (mode, operands[1]); return false; } /* Output a library call to a function called FNAME that has been arranged to be local to any dso. */ const char * arc_output_libcall (const char *fname) { unsigned len = strlen (fname); static char buf[64]; gcc_assert (len < sizeof buf - 35); if (TARGET_LONG_CALLS_SET || (TARGET_MEDIUM_CALLS && arc_ccfsm_cond_exec_p ())) { if (flag_pic) sprintf (buf, "add r12,pcl,@%s@pcl\n\tjl%%!%%* [r12]", fname); else sprintf (buf, "jl%%! @%s", fname); } else sprintf (buf, "bl%%!%%* @%s", fname); return buf; } /* Return the SImode highpart of the DImode value IN. */ rtx disi_highpart (rtx in) { return simplify_gen_subreg (SImode, in, DImode, TARGET_BIG_ENDIAN ? 0 : 4); } /* Return length adjustment for INSN. For ARC600: A write to a core reg greater or equal to 32 must not be immediately followed by a use. Anticipate the length requirement to insert a nop between PRED and SUCC to prevent a hazard. */ static int arc600_corereg_hazard (rtx_insn *pred, rtx_insn *succ) { if (!TARGET_ARC600) return 0; if (GET_CODE (PATTERN (pred)) == SEQUENCE) pred = as_a (PATTERN (pred))->insn (1); if (GET_CODE (PATTERN (succ)) == SEQUENCE) succ = as_a (PATTERN (succ))->insn (0); if (recog_memoized (pred) == CODE_FOR_mulsi_600 || recog_memoized (pred) == CODE_FOR_umul_600 || recog_memoized (pred) == CODE_FOR_mac_600 || recog_memoized (pred) == CODE_FOR_mul64_600 || recog_memoized (pred) == CODE_FOR_mac64_600 || recog_memoized (pred) == CODE_FOR_umul64_600 || recog_memoized (pred) == CODE_FOR_umac64_600) return 0; subrtx_iterator::array_type array; FOR_EACH_SUBRTX (iter, array, PATTERN (pred), NONCONST) { const_rtx x = *iter; switch (GET_CODE (x)) { case SET: case POST_INC: case POST_DEC: case PRE_INC: case PRE_DEC: break; default: /* This is also fine for PRE/POST_MODIFY, because they contain a SET. */ continue; } rtx dest = XEXP (x, 0); /* Check if this sets an extension register. N.B. we use 61 for the condition codes, which is definitely not an extension register. */ if (REG_P (dest) && REGNO (dest) >= 32 && REGNO (dest) < 61 /* Check if the same register is used by the PAT. */ && (refers_to_regno_p (REGNO (dest), REGNO (dest) + (GET_MODE_SIZE (GET_MODE (dest)) + 3) / 4U, PATTERN (succ), 0))) return 4; } return 0; } /* Given a rtx, check if it is an assembly instruction or not. */ static int arc_asm_insn_p (rtx x) { int i, j; if (x == 0) return 0; switch (GET_CODE (x)) { case ASM_OPERANDS: case ASM_INPUT: return 1; case SET: return arc_asm_insn_p (SET_SRC (x)); case PARALLEL: j = 0; for (i = XVECLEN (x, 0) - 1; i >= 0; i--) j += arc_asm_insn_p (XVECEXP (x, 0, i)); if ( j > 0) return 1; break; default: break; } return 0; } /* For ARC600: A write to a core reg greater or equal to 32 must not be immediately followed by a use. Anticipate the length requirement to insert a nop between PRED and SUCC to prevent a hazard. */ int arc_hazard (rtx_insn *pred, rtx_insn *succ) { if (!pred || !INSN_P (pred) || !succ || !INSN_P (succ)) return 0; if (TARGET_ARC600) return arc600_corereg_hazard (pred, succ); return 0; } /* Return length adjustment for INSN. */ int arc_adjust_insn_length (rtx_insn *insn, int len, bool) { if (!INSN_P (insn)) return len; /* We already handle sequences by ignoring the delay sequence flag. */ if (GET_CODE (PATTERN (insn)) == SEQUENCE) return len; /* Check for return with but one preceding insn since function start / call. */ if (TARGET_PAD_RETURN && JUMP_P (insn) && GET_CODE (PATTERN (insn)) != ADDR_VEC && GET_CODE (PATTERN (insn)) != ADDR_DIFF_VEC && get_attr_type (insn) == TYPE_RETURN) { rtx_insn *prev = prev_active_insn (insn); if (!prev || !(prev = prev_active_insn (prev)) || ((NONJUMP_INSN_P (prev) && GET_CODE (PATTERN (prev)) == SEQUENCE) ? CALL_ATTR (as_a (PATTERN (prev))->insn (0), NON_SIBCALL) : CALL_ATTR (prev, NON_SIBCALL))) return len + 4; } if (TARGET_ARC600) { rtx_insn *succ = next_real_insn (insn); /* One the ARC600, a write to an extension register must be separated from a read. */ if (succ && INSN_P (succ)) len += arc600_corereg_hazard (insn, succ); } /* Restore extracted operands - otherwise splitters like the addsi3_mixed one can go awry. */ extract_constrain_insn_cached (insn); return len; } /* Return a copy of COND from *STATEP, inverted if that is indicated by the CC field of *STATEP. */ static rtx arc_get_ccfsm_cond (struct arc_ccfsm *statep, bool reverse) { rtx cond = statep->cond; int raw_cc = get_arc_condition_code (cond); if (reverse) raw_cc = ARC_INVERSE_CONDITION_CODE (raw_cc); if (statep->cc == raw_cc) return copy_rtx (cond); gcc_assert (ARC_INVERSE_CONDITION_CODE (raw_cc) == statep->cc); machine_mode ccm = GET_MODE (XEXP (cond, 0)); enum rtx_code code = reverse_condition (GET_CODE (cond)); if (code == UNKNOWN || ccm == CC_FP_GTmode || ccm == CC_FP_GEmode) code = reverse_condition_maybe_unordered (GET_CODE (cond)); return gen_rtx_fmt_ee (code, GET_MODE (cond), copy_rtx (XEXP (cond, 0)), copy_rtx (XEXP (cond, 1))); } /* Return version of PAT conditionalized with COND, which is part of INSN. ANNULLED indicates if INSN is an annulled delay-slot insn. Register further changes if necessary. */ static rtx conditionalize_nonjump (rtx pat, rtx cond, rtx insn, bool annulled) { /* For commutative operators, we generally prefer to have the first source match the destination. */ if (GET_CODE (pat) == SET) { rtx src = SET_SRC (pat); if (COMMUTATIVE_P (src)) { rtx src0 = XEXP (src, 0); rtx src1 = XEXP (src, 1); rtx dst = SET_DEST (pat); if (rtx_equal_p (src1, dst) && !rtx_equal_p (src0, dst) /* Leave add_n alone - the canonical form is to have the complex summand first. */ && REG_P (src0)) pat = gen_rtx_SET (dst, gen_rtx_fmt_ee (GET_CODE (src), GET_MODE (src), src1, src0)); } } /* dwarf2out.c:dwarf2out_frame_debug_expr doesn't know what to do with COND_EXEC. */ if (RTX_FRAME_RELATED_P (insn)) { /* If this is the delay slot insn of an anulled branch, dwarf2out.c:scan_trace understands the anulling semantics without the COND_EXEC. */ gcc_assert (annulled); rtx note = alloc_reg_note (REG_FRAME_RELATED_EXPR, pat, REG_NOTES (insn)); validate_change (insn, ®_NOTES (insn), note, 1); } pat = gen_rtx_COND_EXEC (VOIDmode, cond, pat); return pat; } /* Use the ccfsm machinery to do if conversion. */ static unsigned arc_ifcvt (void) { struct arc_ccfsm *statep = &cfun->machine->ccfsm_current; memset (statep, 0, sizeof *statep); for (rtx_insn *insn = get_insns (); insn; insn = next_insn (insn)) { arc_ccfsm_advance (insn, statep); switch (statep->state) { case 0: break; case 1: case 2: { /* Deleted branch. */ arc_ccfsm_post_advance (insn, statep); gcc_assert (!IN_RANGE (statep->state, 1, 2)); rtx_insn *seq = NEXT_INSN (PREV_INSN (insn)); if (GET_CODE (PATTERN (seq)) == SEQUENCE) { rtx slot = XVECEXP (PATTERN (seq), 0, 1); rtx pat = PATTERN (slot); if (INSN_ANNULLED_BRANCH_P (insn)) { rtx cond = arc_get_ccfsm_cond (statep, INSN_FROM_TARGET_P (slot)); pat = gen_rtx_COND_EXEC (VOIDmode, cond, pat); } if (!validate_change (seq, &PATTERN (seq), pat, 0)) gcc_unreachable (); PUT_CODE (slot, NOTE); NOTE_KIND (slot) = NOTE_INSN_DELETED; } else { set_insn_deleted (insn); } continue; } case 3: if (LABEL_P (insn) && statep->target_label == CODE_LABEL_NUMBER (insn)) { arc_ccfsm_post_advance (insn, statep); if (--LABEL_NUSES (insn) == 0) delete_insn (insn); continue; } /* Fall through. */ case 4: case 5: if (!NONDEBUG_INSN_P (insn)) break; /* Conditionalized insn. */ rtx_insn *prev, *pprev; rtx *patp, pat, cond; bool annulled; annulled = false; /* If this is a delay slot insn in a non-annulled branch, don't conditionalize it. N.B., this should be fine for conditional return too. However, don't do this for unconditional branches, as these would be encountered when processing an 'else' part. */ prev = PREV_INSN (insn); pprev = PREV_INSN (prev); if (pprev && NEXT_INSN (NEXT_INSN (pprev)) == NEXT_INSN (insn) && JUMP_P (prev) && get_attr_cond (prev) == COND_USE) { if (!INSN_ANNULLED_BRANCH_P (prev)) break; annulled = true; } patp = &PATTERN (insn); pat = *patp; cond = arc_get_ccfsm_cond (statep, INSN_FROM_TARGET_P (insn)); if (NONJUMP_INSN_P (insn) || CALL_P (insn)) { /* ??? don't conditionalize if all side effects are dead in the not-execute case. */ pat = conditionalize_nonjump (pat, cond, insn, annulled); } else if (simplejump_p (insn)) { patp = &SET_SRC (pat); pat = gen_rtx_IF_THEN_ELSE (VOIDmode, cond, *patp, pc_rtx); } else if (JUMP_P (insn) && ANY_RETURN_P (PATTERN (insn))) { pat = gen_rtx_IF_THEN_ELSE (VOIDmode, cond, pat, pc_rtx); pat = gen_rtx_SET (pc_rtx, pat); } else gcc_unreachable (); validate_change (insn, patp, pat, 1); if (!apply_change_group ()) gcc_unreachable (); if (JUMP_P (insn)) { rtx_insn *next = next_nonnote_insn (insn); if (GET_CODE (next) == BARRIER) delete_insn (next); if (statep->state == 3) continue; } break; default: gcc_unreachable (); } arc_ccfsm_post_advance (insn, statep); } return 0; } /* Find annulled delay insns and convert them to use the appropriate predicate. This allows branch shortening to size up these insns properly. */ static unsigned arc_predicate_delay_insns (void) { for (rtx_insn *insn = get_insns (); insn; insn = NEXT_INSN (insn)) { rtx pat, jump, dlay, src, cond, *patp; int reverse; if (!NONJUMP_INSN_P (insn) || GET_CODE (pat = PATTERN (insn)) != SEQUENCE) continue; jump = XVECEXP (pat, 0, 0); dlay = XVECEXP (pat, 0, 1); if (!JUMP_P (jump) || !INSN_ANNULLED_BRANCH_P (jump)) continue; /* If the branch insn does the annulling, leave the delay insn alone. */ if (!TARGET_AT_DBR_CONDEXEC && !INSN_FROM_TARGET_P (dlay)) continue; /* ??? Could also leave DLAY un-conditionalized if its target is dead on the other path. */ gcc_assert (GET_CODE (PATTERN (jump)) == SET); gcc_assert (SET_DEST (PATTERN (jump)) == pc_rtx); src = SET_SRC (PATTERN (jump)); gcc_assert (GET_CODE (src) == IF_THEN_ELSE); cond = XEXP (src, 0); if (XEXP (src, 2) == pc_rtx) reverse = 0; else if (XEXP (src, 1) == pc_rtx) reverse = 1; else gcc_unreachable (); if (reverse != !INSN_FROM_TARGET_P (dlay)) { machine_mode ccm = GET_MODE (XEXP (cond, 0)); enum rtx_code code = reverse_condition (GET_CODE (cond)); if (code == UNKNOWN || ccm == CC_FP_GTmode || ccm == CC_FP_GEmode) code = reverse_condition_maybe_unordered (GET_CODE (cond)); cond = gen_rtx_fmt_ee (code, GET_MODE (cond), copy_rtx (XEXP (cond, 0)), copy_rtx (XEXP (cond, 1))); } else cond = copy_rtx (cond); patp = &PATTERN (dlay); pat = *patp; pat = conditionalize_nonjump (pat, cond, dlay, true); validate_change (dlay, patp, pat, 1); if (!apply_change_group ()) gcc_unreachable (); } return 0; } /* For ARC600: If a write to a core reg >=32 appears in a delay slot (other than of a forward brcc), it creates a hazard when there is a read of the same register at the branch target. We can't know what is at the branch target of calls, and for branches, we don't really know before the end of delay slot scheduling, either. Not only can individual instruction be hoisted out into a delay slot, a basic block can also be emptied this way, and branch and/or fall through targets be redirected. Hence we don't want such writes in a delay slot. */ /* Return nonzreo iff INSN writes to an extension core register. */ int arc_write_ext_corereg (rtx insn) { subrtx_iterator::array_type array; FOR_EACH_SUBRTX (iter, array, PATTERN (insn), NONCONST) { const_rtx x = *iter; switch (GET_CODE (x)) { case SET: case POST_INC: case POST_DEC: case PRE_INC: case PRE_DEC: break; default: /* This is also fine for PRE/POST_MODIFY, because they contain a SET. */ continue; } const_rtx dest = XEXP (x, 0); if (REG_P (dest) && REGNO (dest) >= 32 && REGNO (dest) < 61) return 1; } return 0; } /* This is like the hook, but returns NULL when it can't / won't generate a legitimate address. */ static rtx arc_legitimize_address_0 (rtx x, rtx oldx ATTRIBUTE_UNUSED, machine_mode mode) { rtx addr, inner; addr = x; if (GET_CODE (addr) == CONST) addr = XEXP (addr, 0); if (GET_CODE (addr) == PLUS && CONST_INT_P (XEXP (addr, 1)) && ((GET_CODE (XEXP (addr, 0)) == SYMBOL_REF && !SYMBOL_REF_FUNCTION_P (XEXP (addr, 0))) || (REG_P (XEXP (addr, 0)) && (INTVAL (XEXP (addr, 1)) & 252)))) { HOST_WIDE_INT offs, upper; int size = GET_MODE_SIZE (mode); offs = INTVAL (XEXP (addr, 1)); upper = (offs + 256 * size) & ~511 * size; inner = plus_constant (Pmode, XEXP (addr, 0), upper); #if 0 /* ??? this produces worse code for EEMBC idctrn01 */ if (GET_CODE (x) == CONST) inner = gen_rtx_CONST (Pmode, inner); #endif addr = plus_constant (Pmode, force_reg (Pmode, inner), offs - upper); x = addr; } else if (GET_CODE (addr) == SYMBOL_REF && !SYMBOL_REF_FUNCTION_P (addr)) x = force_reg (Pmode, x); if (memory_address_p ((machine_mode) mode, x)) return x; return NULL_RTX; } static rtx arc_legitimize_address (rtx orig_x, rtx oldx, machine_mode mode) { rtx new_x = arc_legitimize_address_0 (orig_x, oldx, mode); if (new_x) return new_x; return orig_x; } static rtx arc_delegitimize_address_0 (rtx op) { switch (GET_CODE (op)) { case CONST: return arc_delegitimize_address_0 (XEXP (op, 0)); case UNSPEC: switch (XINT (op, 1)) { case ARC_UNSPEC_GOT: case ARC_UNSPEC_GOTOFFPC: return XVECEXP (op, 0, 0); default: break; } break; case PLUS: { rtx t1 = arc_delegitimize_address_0 (XEXP (op, 0)); rtx t2 = XEXP (op, 1); if (t1 && t2) return gen_rtx_PLUS (GET_MODE (op), t1, t2); break; } default: break; } return NULL_RTX; } static rtx arc_delegitimize_address (rtx orig_x) { rtx x = orig_x; if (MEM_P (x)) x = XEXP (x, 0); x = arc_delegitimize_address_0 (x); if (!x) return orig_x; if (MEM_P (orig_x)) x = replace_equiv_address_nv (orig_x, x); return x; } /* Return a REG rtx for acc1. N.B. the gcc-internal representation may differ from the hardware register number in order to allow the generic code to correctly split the concatenation of acc1 and acc2. */ rtx gen_acc1 (void) { return gen_rtx_REG (SImode, TARGET_BIG_ENDIAN ? 56: 57); } /* Return a REG rtx for acc2. N.B. the gcc-internal representation may differ from the hardware register number in order to allow the generic code to correctly split the concatenation of acc1 and acc2. */ rtx gen_acc2 (void) { return gen_rtx_REG (SImode, TARGET_BIG_ENDIAN ? 57: 56); } /* FIXME: a parameter should be added, and code added to final.c, to reproduce this functionality in shorten_branches. */ #if 0 /* Return nonzero iff BRANCH should be unaligned if possible by upsizing a previous instruction. */ int arc_unalign_branch_p (rtx branch) { rtx note; if (!TARGET_UNALIGN_BRANCH) return 0; /* Do not do this if we have a filled delay slot. */ if (get_attr_delay_slot_filled (branch) == DELAY_SLOT_FILLED_YES && !NEXT_INSN (branch)->deleted ()) return 0; note = find_reg_note (branch, REG_BR_PROB, 0); return (!note || (arc_unalign_prob_threshold && !br_prob_note_reliable_p (note)) || INTVAL (XEXP (note, 0)) < arc_unalign_prob_threshold); } #endif /* When estimating sizes during arc_reorg, when optimizing for speed, there are three reasons why we need to consider branches to be length 6: - annull-false delay slot insns are implemented using conditional execution, thus preventing short insn formation where used. - for ARC600: annul-true delay slot insns are implemented where possible using conditional execution, preventing short insn formation where used. - for ARC700: likely or somewhat likely taken branches are made long and unaligned if possible to avoid branch penalty. */ bool arc_branch_size_unknown_p (void) { return !optimize_size && arc_reorg_in_progress; } /* The usual; we set up our machine_function data. */ static struct machine_function * arc_init_machine_status (void) { struct machine_function *machine; machine = ggc_cleared_alloc (); machine->fn_type = ARC_FUNCTION_UNKNOWN; return machine; } /* Implements INIT_EXPANDERS. We just set up to call the above function. */ void arc_init_expanders (void) { init_machine_status = arc_init_machine_status; } /* Check if OP is a proper parallel of a millicode call pattern. OFFSET indicates a number of elements to ignore - that allows to have a sibcall pattern that starts with (return). LOAD_P is zero for store multiple (for prologues), and one for load multiples (for epilogues), and two for load multiples where no final clobber of blink is required. We also skip the first load / store element since this is supposed to be checked in the instruction pattern. */ int arc_check_millicode (rtx op, int offset, int load_p) { int len = XVECLEN (op, 0) - offset; int i; if (load_p == 2) { if (len < 2 || len > 13) return 0; load_p = 1; } else { rtx elt = XVECEXP (op, 0, --len); if (GET_CODE (elt) != CLOBBER || !REG_P (XEXP (elt, 0)) || REGNO (XEXP (elt, 0)) != RETURN_ADDR_REGNUM || len < 3 || len > 13) return 0; } for (i = 1; i < len; i++) { rtx elt = XVECEXP (op, 0, i + offset); rtx reg, mem, addr; if (GET_CODE (elt) != SET) return 0; mem = XEXP (elt, load_p); reg = XEXP (elt, 1-load_p); if (!REG_P (reg) || REGNO (reg) != 13U+i || !MEM_P (mem)) return 0; addr = XEXP (mem, 0); if (GET_CODE (addr) != PLUS || !rtx_equal_p (stack_pointer_rtx, XEXP (addr, 0)) || !CONST_INT_P (XEXP (addr, 1)) || INTVAL (XEXP (addr, 1)) != i*4) return 0; } return 1; } /* Accessor functions for cfun->machine->unalign. */ void arc_clear_unalign (void) { if (cfun) cfun->machine->unalign = 0; } void arc_toggle_unalign (void) { cfun->machine->unalign ^= 2; } /* Operands 0..2 are the operands of a addsi which uses a 12 bit constant in operand 2, but which would require a LIMM because of operand mismatch. operands 3 and 4 are new SET_SRCs for operands 0. */ void split_addsi (rtx *operands) { int val = INTVAL (operands[2]); /* Try for two short insns first. Lengths being equal, we prefer expansions with shorter register lifetimes. */ if (val > 127 && val <= 255 && satisfies_constraint_Rcq (operands[0])) { operands[3] = operands[2]; operands[4] = gen_rtx_PLUS (SImode, operands[0], operands[1]); } else { operands[3] = operands[1]; operands[4] = gen_rtx_PLUS (SImode, operands[0], operands[2]); } } /* Operands 0..2 are the operands of a subsi which uses a 12 bit constant in operand 1, but which would require a LIMM because of operand mismatch. operands 3 and 4 are new SET_SRCs for operands 0. */ void split_subsi (rtx *operands) { int val = INTVAL (operands[1]); /* Try for two short insns first. Lengths being equal, we prefer expansions with shorter register lifetimes. */ if (satisfies_constraint_Rcq (operands[0]) && satisfies_constraint_Rcq (operands[2])) { if (val >= -31 && val <= 127) { operands[3] = gen_rtx_NEG (SImode, operands[2]); operands[4] = gen_rtx_PLUS (SImode, operands[0], operands[1]); return; } else if (val >= 0 && val < 255) { operands[3] = operands[1]; operands[4] = gen_rtx_MINUS (SImode, operands[0], operands[2]); return; } } /* If the destination is not an ARCompact16 register, we might still have a chance to make a short insn if the source is; we need to start with a reg-reg move for this. */ operands[3] = operands[2]; operands[4] = gen_rtx_MINUS (SImode, operands[1], operands[0]); } /* Handle DOUBLE_REGS uses. Operand 0: destination register Operand 1: source register */ static bool arc_process_double_reg_moves (rtx *operands) { enum usesDxState { none, srcDx, destDx, maxDx }; enum usesDxState state = none; rtx dest = operands[0]; rtx src = operands[1]; if (refers_to_regno_p (40, 44, src, 0)) { state = srcDx; gcc_assert (REG_P (dest)); } if (refers_to_regno_p (40, 44, dest, 0)) { /* Via arc_register_move_cost, we should never see D,D moves. */ gcc_assert (REG_P (src)); gcc_assert (state == none); state = destDx; } if (state == none) return false; if (state == srcDx) { /* Without the LR insn, we need to split this into a sequence of insns which will use the DEXCLx and DADDHxy insns to be able to read the Dx register in question. */ if (TARGET_DPFP_DISABLE_LRSR) { /* gen *movdf_insn_nolrsr */ rtx set = gen_rtx_SET (dest, src); rtx use1 = gen_rtx_USE (VOIDmode, const1_rtx); emit_insn (gen_rtx_PARALLEL (VOIDmode, gen_rtvec (2, set, use1))); } else { /* When we have 'mov D, r' or 'mov D, D' then get the target register pair for use with LR insn. */ rtx destHigh = simplify_gen_subreg (SImode, dest, DFmode, TARGET_BIG_ENDIAN ? 0 : 4); rtx destLow = simplify_gen_subreg (SImode, dest, DFmode, TARGET_BIG_ENDIAN ? 4 : 0); /* Produce the two LR insns to get the high and low parts. */ emit_insn (gen_rtx_SET (destHigh, gen_rtx_UNSPEC_VOLATILE (Pmode, gen_rtvec (1, src), VUNSPEC_ARC_LR_HIGH))); emit_insn (gen_rtx_SET (destLow, gen_rtx_UNSPEC_VOLATILE (Pmode, gen_rtvec (1, src), VUNSPEC_ARC_LR))); } } else if (state == destDx) { /* When we have 'mov r, D' or 'mov D, D' and we have access to the LR insn get the target register pair. */ rtx srcHigh = simplify_gen_subreg (SImode, src, DFmode, TARGET_BIG_ENDIAN ? 0 : 4); rtx srcLow = simplify_gen_subreg (SImode, src, DFmode, TARGET_BIG_ENDIAN ? 4 : 0); emit_insn (gen_dexcl_2op (dest, srcHigh, srcLow)); } else gcc_unreachable (); return true; } /* operands 0..1 are the operands of a 64 bit move instruction. split it into two moves with operands 2/3 and 4/5. */ void arc_split_move (rtx *operands) { machine_mode mode = GET_MODE (operands[0]); int i; int swap = 0; rtx xop[4]; if (TARGET_DPFP) { if (arc_process_double_reg_moves (operands)) return; } if (TARGET_LL64 && ((memory_operand (operands[0], mode) && (even_register_operand (operands[1], mode) || satisfies_constraint_Cm3 (operands[1]))) || (memory_operand (operands[1], mode) && even_register_operand (operands[0], mode)))) { emit_move_insn (operands[0], operands[1]); return; } if (TARGET_PLUS_QMACW && GET_CODE (operands[1]) == CONST_VECTOR) { HOST_WIDE_INT intval0, intval1; if (GET_MODE (operands[1]) == V2SImode) { intval0 = INTVAL (XVECEXP (operands[1], 0, 0)); intval1 = INTVAL (XVECEXP (operands[1], 0, 1)); } else { intval1 = INTVAL (XVECEXP (operands[1], 0, 3)) << 16; intval1 |= INTVAL (XVECEXP (operands[1], 0, 2)) & 0xFFFF; intval0 = INTVAL (XVECEXP (operands[1], 0, 1)) << 16; intval0 |= INTVAL (XVECEXP (operands[1], 0, 0)) & 0xFFFF; } xop[0] = gen_rtx_REG (SImode, REGNO (operands[0])); xop[3] = gen_rtx_REG (SImode, REGNO (operands[0]) + 1); xop[2] = GEN_INT (trunc_int_for_mode (intval0, SImode)); xop[1] = GEN_INT (trunc_int_for_mode (intval1, SImode)); emit_move_insn (xop[0], xop[2]); emit_move_insn (xop[3], xop[1]); return; } for (i = 0; i < 2; i++) { if (MEM_P (operands[i]) && auto_inc_p (XEXP (operands[i], 0))) { rtx addr = XEXP (operands[i], 0); rtx r, o; enum rtx_code code; gcc_assert (!reg_overlap_mentioned_p (operands[0], addr)); switch (GET_CODE (addr)) { case PRE_DEC: o = GEN_INT (-8); goto pre_modify; case PRE_INC: o = GEN_INT (8); goto pre_modify; case PRE_MODIFY: o = XEXP (XEXP (addr, 1), 1); pre_modify: code = PRE_MODIFY; break; case POST_DEC: o = GEN_INT (-8); goto post_modify; case POST_INC: o = GEN_INT (8); goto post_modify; case POST_MODIFY: o = XEXP (XEXP (addr, 1), 1); post_modify: code = POST_MODIFY; swap = 2; break; default: gcc_unreachable (); } r = XEXP (addr, 0); xop[0+i] = adjust_automodify_address_nv (operands[i], SImode, gen_rtx_fmt_ee (code, Pmode, r, gen_rtx_PLUS (Pmode, r, o)), 0); xop[2+i] = adjust_automodify_address_nv (operands[i], SImode, plus_constant (Pmode, r, 4), 4); } else { xop[0+i] = operand_subword (operands[i], 0, 0, mode); xop[2+i] = operand_subword (operands[i], 1, 0, mode); } } if (reg_overlap_mentioned_p (xop[0], xop[3])) { swap = 2; gcc_assert (!reg_overlap_mentioned_p (xop[2], xop[1])); } emit_move_insn (xop[0 + swap], xop[1 + swap]); emit_move_insn (xop[2 - swap], xop[3 - swap]); } /* Select between the instruction output templates s_tmpl (for short INSNs) and l_tmpl (for long INSNs). */ const char * arc_short_long (rtx_insn *insn, const char *s_tmpl, const char *l_tmpl) { int is_short = arc_verify_short (insn, cfun->machine->unalign, -1); extract_constrain_insn_cached (insn); return is_short ? s_tmpl : l_tmpl; } /* Searches X for any reference to REGNO, returning the rtx of the reference found if any. Otherwise, returns NULL_RTX. */ rtx arc_regno_use_in (unsigned int regno, rtx x) { const char *fmt; int i, j; rtx tem; if (REG_P (x) && refers_to_regno_p (regno, x)) return x; fmt = GET_RTX_FORMAT (GET_CODE (x)); for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--) { if (fmt[i] == 'e') { if ((tem = regno_use_in (regno, XEXP (x, i)))) return tem; } else if (fmt[i] == 'E') for (j = XVECLEN (x, i) - 1; j >= 0; j--) if ((tem = regno_use_in (regno , XVECEXP (x, i, j)))) return tem; } return NULL_RTX; } /* Return the integer value of the "type" attribute for INSN, or -1 if INSN can't have attributes. */ static int arc_attr_type (rtx_insn *insn) { if (NONJUMP_INSN_P (insn) ? (GET_CODE (PATTERN (insn)) == USE || GET_CODE (PATTERN (insn)) == CLOBBER) : JUMP_P (insn) ? (GET_CODE (PATTERN (insn)) == ADDR_VEC || GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC) : !CALL_P (insn)) return -1; return get_attr_type (insn); } /* Code has a minimum p2 alignment of 1, which we must restore after an ADDR_DIFF_VEC. */ int arc_label_align (rtx_insn *label) { if (align_labels.levels[0].log < 1) { rtx_insn *next = next_nonnote_nondebug_insn (label); if (INSN_P (next) && recog_memoized (next) >= 0) return 1; } return align_labels.levels[0].log; } /* Return true if LABEL is in executable code. */ bool arc_text_label (rtx_insn *label) { rtx_insn *next; /* ??? We use deleted labels like they were still there, see gcc.c-torture/compile/20000326-2.c . */ gcc_assert (GET_CODE (label) == CODE_LABEL || (GET_CODE (label) == NOTE && NOTE_KIND (label) == NOTE_INSN_DELETED_LABEL)); next = next_nonnote_insn (label); if (next) return (!JUMP_TABLE_DATA_P (next) || GET_CODE (PATTERN (next)) != ADDR_VEC); else if (!PREV_INSN (label)) /* ??? sometimes text labels get inserted very late, see gcc.dg/torture/stackalign/comp-goto-1.c */ return true; return false; } /* Without this, gcc.dg/tree-prof/bb-reorg.c fails to assemble when compiling with -O2 -freorder-blocks-and-partition -fprofile-use -D_PROFILE_USE; delay branch scheduling then follows a crossing jump to redirect two breqs. */ static bool arc_can_follow_jump (const rtx_insn *follower, const rtx_insn *followee) { /* ??? get_attr_type is declared to take an rtx. */ union { const rtx_insn *c; rtx_insn *r; } u; u.c = follower; if (CROSSING_JUMP_P (followee)) switch (get_attr_type (u.r)) { case TYPE_BRANCH: if (get_attr_length (u.r) != 2) break; /* Fall through. */ case TYPE_BRCC: case TYPE_BRCC_NO_DELAY_SLOT: return false; default: return true; } return true; } /* Implement EPILOGUE_USES. Return true if REGNO should be added to the deemed uses of the epilogue. We have to make sure all the register restore instructions are known to be live in interrupt functions, plus the blink register if it is clobbered by the isr. */ bool arc_epilogue_uses (int regno) { unsigned int fn_type; fn_type = arc_compute_function_type (cfun); if (regno == arc_tp_regno) return true; if (regno == RETURN_ADDR_REGNUM) return true; if (regno == arc_return_address_register (fn_type)) return true; if (epilogue_completed && ARC_INTERRUPT_P (fn_type)) { /* An interrupt function restores more registers. */ if (df_regs_ever_live_p (regno) || call_used_or_fixed_reg_p (regno)) return true; } return false; } /* Helper for EH_USES macro. */ bool arc_eh_uses (int regno) { if (regno == arc_tp_regno) return true; return false; } /* Return true if we use LRA instead of reload pass. */ bool arc_lra_p (void) { return arc_lra_flag; } /* ??? Should we define TARGET_REGISTER_PRIORITY? We might perfer to use Rcq registers, because some insn are shorter with them. OTOH we already have separate alternatives for this purpose, and other insns don't mind, so maybe we should rather prefer the other registers? We need more data, and we can only get that if we allow people to try all options. */ static int arc_register_priority (int r) { switch (arc_lra_priority_tag) { case ARC_LRA_PRIORITY_NONE: return 0; case ARC_LRA_PRIORITY_NONCOMPACT: return ((((r & 7) ^ 4) - 4) & 15) != r; case ARC_LRA_PRIORITY_COMPACT: return ((((r & 7) ^ 4) - 4) & 15) == r; default: gcc_unreachable (); } } static reg_class_t arc_spill_class (reg_class_t /* orig_class */, machine_mode) { return GENERAL_REGS; } bool arc_legitimize_reload_address (rtx *p, machine_mode mode, int opnum, int itype) { rtx x = *p; enum reload_type type = (enum reload_type) itype; if (GET_CODE (x) == PLUS && CONST_INT_P (XEXP (x, 1)) && (RTX_OK_FOR_BASE_P (XEXP (x, 0), true) || (REG_P (XEXP (x, 0)) && reg_equiv_constant (REGNO (XEXP (x, 0)))))) { int scale = GET_MODE_SIZE (mode); int shift; rtx index_rtx = XEXP (x, 1); HOST_WIDE_INT offset = INTVAL (index_rtx), offset_base; rtx reg, sum, sum2; if (scale > 4) scale = 4; if ((scale-1) & offset) scale = 1; shift = scale >> 1; offset_base = ((offset + (256 << shift)) & ((HOST_WIDE_INT)((unsigned HOST_WIDE_INT) -512 << shift))); /* Sometimes the normal form does not suit DImode. We could avoid that by using smaller ranges, but that would give less optimized code when SImode is prevalent. */ if (GET_MODE_SIZE (mode) + offset - offset_base <= (256 << shift)) { int regno; reg = XEXP (x, 0); regno = REGNO (reg); sum2 = sum = plus_constant (Pmode, reg, offset_base); if (reg_equiv_constant (regno)) { sum2 = plus_constant (Pmode, reg_equiv_constant (regno), offset_base); if (GET_CODE (sum2) == PLUS) sum2 = gen_rtx_CONST (Pmode, sum2); } *p = gen_rtx_PLUS (Pmode, sum, GEN_INT (offset - offset_base)); push_reload (sum2, NULL_RTX, &XEXP (*p, 0), NULL, BASE_REG_CLASS, Pmode, VOIDmode, 0, 0, opnum, type); return true; } } /* We must re-recognize what we created before. */ else if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 0)) == PLUS && CONST_INT_P (XEXP (XEXP (x, 0), 1)) && REG_P (XEXP (XEXP (x, 0), 0)) && CONST_INT_P (XEXP (x, 1))) { /* Because this address is so complex, we know it must have been created by LEGITIMIZE_RELOAD_ADDRESS before; thus, it is already unshared, and needs no further unsharing. */ push_reload (XEXP (x, 0), NULL_RTX, &XEXP (x, 0), NULL, BASE_REG_CLASS, Pmode, VOIDmode, 0, 0, opnum, type); return true; } return false; } /* Implement TARGET_USE_BY_PIECES_INFRASTRUCTURE_P. */ static bool arc_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size, unsigned int align, enum by_pieces_operation op, bool speed_p) { /* Let the cpymem expander handle small block moves. */ if (op == MOVE_BY_PIECES) return false; return default_use_by_pieces_infrastructure_p (size, align, op, speed_p); } /* Emit a (pre) memory barrier around an atomic sequence according to MODEL. */ static void arc_pre_atomic_barrier (enum memmodel model) { if (need_atomic_barrier_p (model, true)) emit_insn (gen_memory_barrier ()); } /* Emit a (post) memory barrier around an atomic sequence according to MODEL. */ static void arc_post_atomic_barrier (enum memmodel model) { if (need_atomic_barrier_p (model, false)) emit_insn (gen_memory_barrier ()); } /* Expand a compare and swap pattern. */ static void emit_unlikely_jump (rtx insn) { rtx_insn *jump = emit_jump_insn (insn); add_reg_br_prob_note (jump, profile_probability::very_unlikely ()); } /* Expand code to perform a 8 or 16-bit compare and swap by doing 32-bit compare and swap on the word containing the byte or half-word. The difference between a weak and a strong CAS is that the weak version may simply fail. The strong version relies on two loops, one checks if the SCOND op is succsfully or not, the other checks if the 32 bit accessed location which contains the 8 or 16 bit datum is not changed by other thread. The first loop is implemented by the atomic_compare_and_swapsi_1 pattern. The second loops is implemented by this routine. */ static void arc_expand_compare_and_swap_qh (rtx bool_result, rtx result, rtx mem, rtx oldval, rtx newval, rtx weak, rtx mod_s, rtx mod_f) { rtx addr1 = force_reg (Pmode, XEXP (mem, 0)); rtx addr = gen_reg_rtx (Pmode); rtx off = gen_reg_rtx (SImode); rtx oldv = gen_reg_rtx (SImode); rtx newv = gen_reg_rtx (SImode); rtx oldvalue = gen_reg_rtx (SImode); rtx newvalue = gen_reg_rtx (SImode); rtx res = gen_reg_rtx (SImode); rtx resv = gen_reg_rtx (SImode); rtx memsi, val, mask, end_label, loop_label, cc, x; machine_mode mode; bool is_weak = (weak != const0_rtx); /* Truncate the address. */ emit_insn (gen_rtx_SET (addr, gen_rtx_AND (Pmode, addr1, GEN_INT (-4)))); /* Compute the datum offset. */ emit_insn (gen_rtx_SET (off, gen_rtx_AND (SImode, addr1, GEN_INT (3)))); if (TARGET_BIG_ENDIAN) emit_insn (gen_rtx_SET (off, gen_rtx_MINUS (SImode, (GET_MODE (mem) == QImode) ? GEN_INT (3) : GEN_INT (2), off))); /* Normal read from truncated address. */ memsi = gen_rtx_MEM (SImode, addr); set_mem_alias_set (memsi, ALIAS_SET_MEMORY_BARRIER); MEM_VOLATILE_P (memsi) = MEM_VOLATILE_P (mem); val = copy_to_reg (memsi); /* Convert the offset in bits. */ emit_insn (gen_rtx_SET (off, gen_rtx_ASHIFT (SImode, off, GEN_INT (3)))); /* Get the proper mask. */ if (GET_MODE (mem) == QImode) mask = force_reg (SImode, GEN_INT (0xff)); else mask = force_reg (SImode, GEN_INT (0xffff)); emit_insn (gen_rtx_SET (mask, gen_rtx_ASHIFT (SImode, mask, off))); /* Prepare the old and new values. */ emit_insn (gen_rtx_SET (val, gen_rtx_AND (SImode, gen_rtx_NOT (SImode, mask), val))); oldval = gen_lowpart (SImode, oldval); emit_insn (gen_rtx_SET (oldv, gen_rtx_ASHIFT (SImode, oldval, off))); newval = gen_lowpart_common (SImode, newval); emit_insn (gen_rtx_SET (newv, gen_rtx_ASHIFT (SImode, newval, off))); emit_insn (gen_rtx_SET (oldv, gen_rtx_AND (SImode, oldv, mask))); emit_insn (gen_rtx_SET (newv, gen_rtx_AND (SImode, newv, mask))); if (!is_weak) { end_label = gen_label_rtx (); loop_label = gen_label_rtx (); emit_label (loop_label); } /* Make the old and new values. */ emit_insn (gen_rtx_SET (oldvalue, gen_rtx_IOR (SImode, oldv, val))); emit_insn (gen_rtx_SET (newvalue, gen_rtx_IOR (SImode, newv, val))); /* Try an 32bit atomic compare and swap. It clobbers the CC register. */ emit_insn (gen_atomic_compare_and_swapsi_1 (res, memsi, oldvalue, newvalue, weak, mod_s, mod_f)); /* Regardless of the weakness of the operation, a proper boolean result needs to be provided. */ x = gen_rtx_REG (CC_Zmode, CC_REG); x = gen_rtx_EQ (SImode, x, const0_rtx); emit_insn (gen_rtx_SET (bool_result, x)); if (!is_weak) { /* Check the results: if the atomic op is successfully the goto to end label. */ x = gen_rtx_REG (CC_Zmode, CC_REG); x = gen_rtx_EQ (VOIDmode, x, const0_rtx); x = gen_rtx_IF_THEN_ELSE (VOIDmode, x, gen_rtx_LABEL_REF (Pmode, end_label), pc_rtx); emit_jump_insn (gen_rtx_SET (pc_rtx, x)); /* Wait for the right moment when the accessed 32-bit location is stable. */ emit_insn (gen_rtx_SET (resv, gen_rtx_AND (SImode, gen_rtx_NOT (SImode, mask), res))); mode = SELECT_CC_MODE (NE, resv, val); cc = gen_rtx_REG (mode, CC_REG); emit_insn (gen_rtx_SET (cc, gen_rtx_COMPARE (mode, resv, val))); /* Set the new value of the 32 bit location, proper masked. */ emit_insn (gen_rtx_SET (val, resv)); /* Try again if location is unstable. Fall through if only scond op failed. */ x = gen_rtx_NE (VOIDmode, cc, const0_rtx); x = gen_rtx_IF_THEN_ELSE (VOIDmode, x, gen_rtx_LABEL_REF (Pmode, loop_label), pc_rtx); emit_unlikely_jump (gen_rtx_SET (pc_rtx, x)); emit_label (end_label); } /* End: proper return the result for the given mode. */ emit_insn (gen_rtx_SET (res, gen_rtx_AND (SImode, res, mask))); emit_insn (gen_rtx_SET (res, gen_rtx_LSHIFTRT (SImode, res, off))); emit_move_insn (result, gen_lowpart (GET_MODE (result), res)); } /* Helper function used by "atomic_compare_and_swap" expand pattern. */ void arc_expand_compare_and_swap (rtx operands[]) { rtx bval, rval, mem, oldval, newval, is_weak, mod_s, mod_f, x; machine_mode mode; bval = operands[0]; rval = operands[1]; mem = operands[2]; oldval = operands[3]; newval = operands[4]; is_weak = operands[5]; mod_s = operands[6]; mod_f = operands[7]; mode = GET_MODE (mem); if (reg_overlap_mentioned_p (rval, oldval)) oldval = copy_to_reg (oldval); if (mode == SImode) { emit_insn (gen_atomic_compare_and_swapsi_1 (rval, mem, oldval, newval, is_weak, mod_s, mod_f)); x = gen_rtx_REG (CC_Zmode, CC_REG); x = gen_rtx_EQ (SImode, x, const0_rtx); emit_insn (gen_rtx_SET (bval, x)); } else { arc_expand_compare_and_swap_qh (bval, rval, mem, oldval, newval, is_weak, mod_s, mod_f); } } /* Helper function used by the "atomic_compare_and_swapsi_1" pattern. */ void arc_split_compare_and_swap (rtx operands[]) { rtx rval, mem, oldval, newval; machine_mode mode; enum memmodel mod_s, mod_f; bool is_weak; rtx label1, label2, x, cond; rval = operands[0]; mem = operands[1]; oldval = operands[2]; newval = operands[3]; is_weak = (operands[4] != const0_rtx); mod_s = (enum memmodel) INTVAL (operands[5]); mod_f = (enum memmodel) INTVAL (operands[6]); mode = GET_MODE (mem); /* ARC atomic ops work only with 32-bit aligned memories. */ gcc_assert (mode == SImode); arc_pre_atomic_barrier (mod_s); label1 = NULL_RTX; if (!is_weak) { label1 = gen_label_rtx (); emit_label (label1); } label2 = gen_label_rtx (); /* Load exclusive. */ emit_insn (gen_arc_load_exclusivesi (rval, mem)); /* Check if it is oldval. */ mode = SELECT_CC_MODE (NE, rval, oldval); cond = gen_rtx_REG (mode, CC_REG); emit_insn (gen_rtx_SET (cond, gen_rtx_COMPARE (mode, rval, oldval))); x = gen_rtx_NE (VOIDmode, cond, const0_rtx); x = gen_rtx_IF_THEN_ELSE (VOIDmode, x, gen_rtx_LABEL_REF (Pmode, label2), pc_rtx); emit_unlikely_jump (gen_rtx_SET (pc_rtx, x)); /* Exclusively store new item. Store clobbers CC reg. */ emit_insn (gen_arc_store_exclusivesi (mem, newval)); if (!is_weak) { /* Check the result of the store. */ cond = gen_rtx_REG (CC_Zmode, CC_REG); x = gen_rtx_NE (VOIDmode, cond, const0_rtx); x = gen_rtx_IF_THEN_ELSE (VOIDmode, x, gen_rtx_LABEL_REF (Pmode, label1), pc_rtx); emit_unlikely_jump (gen_rtx_SET (pc_rtx, x)); } if (mod_f != MEMMODEL_RELAXED) emit_label (label2); arc_post_atomic_barrier (mod_s); if (mod_f == MEMMODEL_RELAXED) emit_label (label2); } /* Expand an atomic fetch-and-operate pattern. CODE is the binary operation to perform. MEM is the memory on which to operate. VAL is the second operand of the binary operator. BEFORE and AFTER are optional locations to return the value of MEM either before of after the operation. MODEL_RTX is a CONST_INT containing the memory model to use. */ void arc_expand_atomic_op (enum rtx_code code, rtx mem, rtx val, rtx orig_before, rtx orig_after, rtx model_rtx) { enum memmodel model = (enum memmodel) INTVAL (model_rtx); machine_mode mode = GET_MODE (mem); rtx label, x, cond; rtx before = orig_before, after = orig_after; /* ARC atomic ops work only with 32-bit aligned memories. */ gcc_assert (mode == SImode); arc_pre_atomic_barrier (model); label = gen_label_rtx (); emit_label (label); label = gen_rtx_LABEL_REF (VOIDmode, label); if (before == NULL_RTX) before = gen_reg_rtx (mode); if (after == NULL_RTX) after = gen_reg_rtx (mode); /* Load exclusive. */ emit_insn (gen_arc_load_exclusivesi (before, mem)); switch (code) { case NOT: x = gen_rtx_AND (mode, before, val); emit_insn (gen_rtx_SET (after, x)); x = gen_rtx_NOT (mode, after); emit_insn (gen_rtx_SET (after, x)); break; case MINUS: if (CONST_INT_P (val)) { val = GEN_INT (-INTVAL (val)); code = PLUS; } /* FALLTHRU. */ default: x = gen_rtx_fmt_ee (code, mode, before, val); emit_insn (gen_rtx_SET (after, x)); break; } /* Exclusively store new item. Store clobbers CC reg. */ emit_insn (gen_arc_store_exclusivesi (mem, after)); /* Check the result of the store. */ cond = gen_rtx_REG (CC_Zmode, CC_REG); x = gen_rtx_NE (VOIDmode, cond, const0_rtx); x = gen_rtx_IF_THEN_ELSE (VOIDmode, x, label, pc_rtx); emit_unlikely_jump (gen_rtx_SET (pc_rtx, x)); arc_post_atomic_barrier (model); } /* Implement TARGET_NO_SPECULATION_IN_DELAY_SLOTS_P. */ static bool arc_no_speculation_in_delay_slots_p () { return true; } /* Return a parallel of registers to represent where to find the register pieces if required, otherwise NULL_RTX. */ static rtx arc_dwarf_register_span (rtx rtl) { machine_mode mode = GET_MODE (rtl); unsigned regno; rtx p; if (GET_MODE_SIZE (mode) != 8) return NULL_RTX; p = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (2)); regno = REGNO (rtl); XVECEXP (p, 0, 0) = gen_rtx_REG (SImode, regno); XVECEXP (p, 0, 1) = gen_rtx_REG (SImode, regno + 1); return p; } /* Return true if OP is an acceptable memory operand for ARCompact 16-bit load instructions of MODE. AV2SHORT: TRUE if address needs to fit into the new ARCv2 short non scaled instructions. SCALED: TRUE if address can be scaled. */ bool compact_memory_operand_p (rtx op, machine_mode mode, bool av2short, bool scaled) { rtx addr, plus0, plus1; int size, off; /* Eliminate non-memory operations. */ if (GET_CODE (op) != MEM) return 0; /* .di instructions have no 16-bit form. */ if (MEM_VOLATILE_P (op) && !TARGET_VOLATILE_CACHE_SET) return false; /* likewise for uncached types. */ if (arc_is_uncached_mem_p (op)) return false; if (mode == VOIDmode) mode = GET_MODE (op); size = GET_MODE_SIZE (mode); /* dword operations really put out 2 instructions, so eliminate them. */ if (size > UNITS_PER_WORD) return false; /* Decode the address now. */ addr = XEXP (op, 0); switch (GET_CODE (addr)) { case REG: return (REGNO (addr) >= FIRST_PSEUDO_REGISTER || COMPACT_GP_REG_P (REGNO (addr)) || (SP_REG_P (REGNO (addr)) && (size != 2))); case PLUS: plus0 = XEXP (addr, 0); plus1 = XEXP (addr, 1); if ((GET_CODE (plus0) == REG) && ((REGNO (plus0) >= FIRST_PSEUDO_REGISTER) || COMPACT_GP_REG_P (REGNO (plus0))) && ((GET_CODE (plus1) == REG) && ((REGNO (plus1) >= FIRST_PSEUDO_REGISTER) || COMPACT_GP_REG_P (REGNO (plus1))))) { return !av2short; } if ((GET_CODE (plus0) == REG) && ((REGNO (plus0) >= FIRST_PSEUDO_REGISTER) || (COMPACT_GP_REG_P (REGNO (plus0)) && !av2short) || (IN_RANGE (REGNO (plus0), 0, 31) && av2short)) && (GET_CODE (plus1) == CONST_INT)) { bool valid = false; off = INTVAL (plus1); /* Negative offset is not supported in 16-bit load/store insns. */ if (off < 0) return 0; /* Only u5 immediates allowed in code density instructions. */ if (av2short) { switch (size) { case 1: return false; case 2: /* This is an ldh_s.x instruction, check the u6 immediate. */ if (COMPACT_GP_REG_P (REGNO (plus0))) valid = true; break; case 4: /* Only u5 immediates allowed in 32bit access code density instructions. */ if (REGNO (plus0) <= 31) return ((off < 32) && (off % 4 == 0)); break; default: return false; } } else if (COMPACT_GP_REG_P (REGNO (plus0))) valid = true; if (valid) { switch (size) { case 1: return (off < 32); case 2: /* The 6-bit constant get shifted to fit the real 5-bits field. Check also for the alignment. */ return ((off < 64) && (off % 2 == 0)); case 4: return ((off < 128) && (off % 4 == 0)); default: return false; } } } if (REG_P (plus0) && CONST_INT_P (plus1) && ((REGNO (plus0) >= FIRST_PSEUDO_REGISTER) || SP_REG_P (REGNO (plus0))) && !av2short) { off = INTVAL (plus1); return ((size != 2) && (off >= 0 && off < 128) && (off % 4 == 0)); } if ((GET_CODE (plus0) == MULT) && (GET_CODE (XEXP (plus0, 0)) == REG) && ((REGNO (XEXP (plus0, 0)) >= FIRST_PSEUDO_REGISTER) || COMPACT_GP_REG_P (REGNO (XEXP (plus0, 0)))) && (GET_CODE (plus1) == REG) && ((REGNO (plus1) >= FIRST_PSEUDO_REGISTER) || COMPACT_GP_REG_P (REGNO (plus1)))) return scaled; default: break ; /* TODO: 'gp' and 'pcl' are to supported as base address operand for 16-bit load instructions. */ } return false; } /* Return nonzero if a jli call should be generated for a call from the current function to DECL. */ bool arc_is_jli_call_p (rtx pat) { tree attrs; tree decl = SYMBOL_REF_DECL (pat); /* If it is not a well defined public function then return false. */ if (!decl || !SYMBOL_REF_FUNCTION_P (pat) || !TREE_PUBLIC (decl)) return false; attrs = TYPE_ATTRIBUTES (TREE_TYPE (decl)); if (lookup_attribute ("jli_always", attrs)) return true; if (lookup_attribute ("jli_fixed", attrs)) return true; return TARGET_JLI_ALWAYS; } /* Handle and "jli" attribute; arguments as in struct attribute_spec.handler. */ static tree arc_handle_jli_attribute (tree *node ATTRIBUTE_UNUSED, tree name, tree args, int, bool *no_add_attrs) { if (!TARGET_V2) { warning (OPT_Wattributes, "%qE attribute only valid for ARCv2 architecture", name); *no_add_attrs = true; } if (args == NULL_TREE) { warning (OPT_Wattributes, "argument of %qE attribute is missing", name); *no_add_attrs = true; } else { if (TREE_CODE (TREE_VALUE (args)) == NON_LVALUE_EXPR) TREE_VALUE (args) = TREE_OPERAND (TREE_VALUE (args), 0); tree arg = TREE_VALUE (args); if (TREE_CODE (arg) != INTEGER_CST) { warning (0, "%qE attribute allows only an integer constant argument", name); *no_add_attrs = true; } /* FIXME! add range check. TREE_INT_CST_LOW (arg) */ } return NULL_TREE; } /* Handle and "scure" attribute; arguments as in struct attribute_spec.handler. */ static tree arc_handle_secure_attribute (tree *node ATTRIBUTE_UNUSED, tree name, tree args, int, bool *no_add_attrs) { if (!TARGET_EM) { warning (OPT_Wattributes, "%qE attribute only valid for ARC EM architecture", name); *no_add_attrs = true; } if (args == NULL_TREE) { warning (OPT_Wattributes, "argument of %qE attribute is missing", name); *no_add_attrs = true; } else { if (TREE_CODE (TREE_VALUE (args)) == NON_LVALUE_EXPR) TREE_VALUE (args) = TREE_OPERAND (TREE_VALUE (args), 0); tree arg = TREE_VALUE (args); if (TREE_CODE (arg) != INTEGER_CST) { warning (0, "%qE attribute allows only an integer constant argument", name); *no_add_attrs = true; } } return NULL_TREE; } /* Return nonzero if the symbol is a secure function. */ bool arc_is_secure_call_p (rtx pat) { tree attrs; tree decl = SYMBOL_REF_DECL (pat); if (!decl) return false; attrs = TYPE_ATTRIBUTES (TREE_TYPE (decl)); if (lookup_attribute ("secure_call", attrs)) return true; return false; } /* Handle "uncached" qualifier. */ static tree arc_handle_uncached_attribute (tree *node, tree name, tree args, int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) { if (DECL_P (*node) && TREE_CODE (*node) != TYPE_DECL) { error ("%qE attribute only applies to types", name); *no_add_attrs = true; } else if (args) { warning (OPT_Wattributes, "argument of %qE attribute ignored", name); } return NULL_TREE; } /* Return TRUE if PAT is a memory addressing an uncached data. */ bool arc_is_uncached_mem_p (rtx pat) { tree attrs = NULL_TREE; tree addr; if (!MEM_P (pat)) return false; /* Get the memory attributes. */ addr = MEM_EXPR (pat); if (!addr) return false; /* Get the attributes. */ if (TREE_CODE (addr) == MEM_REF || TREE_CODE (addr) == VAR_DECL) { attrs = TYPE_ATTRIBUTES (TREE_TYPE (addr)); if (lookup_attribute ("uncached", attrs)) return true; } if (TREE_CODE (addr) == MEM_REF) { attrs = TYPE_ATTRIBUTES (TREE_TYPE (TREE_OPERAND (addr, 0))); if (lookup_attribute ("uncached", attrs)) return true; attrs = TYPE_ATTRIBUTES (TREE_TYPE (TREE_OPERAND (addr, 1))); if (lookup_attribute ("uncached", attrs)) return true; } /* Check the definitions of the structs. */ while (handled_component_p (addr)) { if (TREE_CODE (addr) == COMPONENT_REF) { attrs = TYPE_ATTRIBUTES (TREE_TYPE (addr)); if (lookup_attribute ("uncached", attrs)) return true; attrs = TYPE_ATTRIBUTES (TREE_TYPE (TREE_OPERAND (addr, 0))); if (lookup_attribute ("uncached", attrs)) return true; attrs = TYPE_ATTRIBUTES (TREE_TYPE (TREE_OPERAND (addr, 1))); if (lookup_attribute ("uncached", attrs)) return true; } addr = TREE_OPERAND (addr, 0); } return false; } /* Handle aux attribute. The auxiliary registers are addressed using special instructions lr and sr. The attribute 'aux' indicates if a variable refers to the aux-regs and what is the register number desired. */ static tree arc_handle_aux_attribute (tree *node, tree name, tree args, int, bool *no_add_attrs) { /* Isn't it better to use address spaces for the aux-regs? */ if (DECL_P (*node)) { if (TREE_CODE (*node) != VAR_DECL) { error ("%qE attribute only applies to variables", name); *no_add_attrs = true; } else if (args) { if (TREE_CODE (TREE_VALUE (args)) == NON_LVALUE_EXPR) TREE_VALUE (args) = TREE_OPERAND (TREE_VALUE (args), 0); tree arg = TREE_VALUE (args); if (TREE_CODE (arg) != INTEGER_CST) { warning (OPT_Wattributes, "%qE attribute allows only an integer " "constant argument", name); *no_add_attrs = true; } /* FIXME! add range check. TREE_INT_CST_LOW (arg) */ } if (TREE_CODE (*node) == VAR_DECL) { tree fntype = TREE_TYPE (*node); if (fntype && TREE_CODE (fntype) == POINTER_TYPE) { tree attrs = tree_cons (get_identifier ("aux"), NULL_TREE, TYPE_ATTRIBUTES (fntype)); TYPE_ATTRIBUTES (fntype) = attrs; } } } return NULL_TREE; } /* Implement TARGET_USE_ANCHORS_FOR_SYMBOL_P. We don't want to use anchors for small data: the GP register acts as an anchor in that case. We also don't want to use them for PC-relative accesses, where the PC acts as an anchor. Prohibit also TLS symbols to use anchors. */ static bool arc_use_anchors_for_symbol_p (const_rtx symbol) { if (SYMBOL_REF_TLS_MODEL (symbol)) return false; if (flag_pic) return false; if (SYMBOL_REF_SMALL_P (symbol)) return false; return default_use_anchors_for_symbol_p (symbol); } /* Return true if SUBST can't safely replace its equivalent during RA. */ static bool arc_cannot_substitute_mem_equiv_p (rtx) { /* If SUBST is mem[base+index], the address may not fit ISA, thus return true. */ return true; } /* Checks whether the operands are valid for use in an LDD/STD instruction. Assumes that RT, and RT2 are REG. This is guaranteed by the patterns. Assumes that the address in the base register RN is word aligned. Pattern guarantees that both memory accesses use the same base register, the offsets are constants within the range, and the gap between the offsets is 4. If reload complete then check that registers are legal. */ static bool operands_ok_ldd_std (rtx rt, rtx rt2, HOST_WIDE_INT offset) { unsigned int t, t2; if (!reload_completed) return true; if (!(SMALL_INT_RANGE (offset, (GET_MODE_SIZE (DImode) - 1) & (~0x03), (offset & (GET_MODE_SIZE (DImode) - 1) & 3 ? 0 : -(-GET_MODE_SIZE (DImode) | (~0x03)) >> 1)))) return false; t = REGNO (rt); t2 = REGNO (rt2); if ((t2 == PCL_REG) || (t % 2 != 0) /* First destination register is not even. */ || (t2 != t + 1)) return false; return true; } /* Helper for gen_operands_ldd_std. Returns true iff the memory operand MEM's address contains an immediate offset from the base register and has no side effects, in which case it sets BASE and OFFSET accordingly. */ static bool mem_ok_for_ldd_std (rtx mem, rtx *base, rtx *offset) { rtx addr; gcc_assert (base != NULL && offset != NULL); /* TODO: Handle more general memory operand patterns, such as PRE_DEC and PRE_INC. */ if (side_effects_p (mem)) return false; /* Can't deal with subregs. */ if (GET_CODE (mem) == SUBREG) return false; gcc_assert (MEM_P (mem)); *offset = const0_rtx; addr = XEXP (mem, 0); /* If addr isn't valid for DImode, then we can't handle it. */ if (!arc_legitimate_address_p (DImode, addr, reload_in_progress || reload_completed)) return false; if (REG_P (addr)) { *base = addr; return true; } else if (GET_CODE (addr) == PLUS || GET_CODE (addr) == MINUS) { *base = XEXP (addr, 0); *offset = XEXP (addr, 1); return (REG_P (*base) && CONST_INT_P (*offset)); } return false; } /* Called from peephole2 to replace two word-size accesses with a single LDD/STD instruction. Returns true iff we can generate a new instruction sequence. That is, both accesses use the same base register and the gap between constant offsets is 4. OPERANDS are the operands found by the peephole matcher; OPERANDS[0,1] are register operands, and OPERANDS[2,3] are the corresponding memory operands. LOAD indicates whether the access is load or store. */ bool gen_operands_ldd_std (rtx *operands, bool load, bool commute) { int i, gap; HOST_WIDE_INT offsets[2], offset; int nops = 2; rtx cur_base, cur_offset, tmp; rtx base = NULL_RTX; /* Check that the memory references are immediate offsets from the same base register. Extract the base register, the destination registers, and the corresponding memory offsets. */ for (i = 0; i < nops; i++) { if (!mem_ok_for_ldd_std (operands[nops+i], &cur_base, &cur_offset)) return false; if (i == 0) base = cur_base; else if (REGNO (base) != REGNO (cur_base)) return false; offsets[i] = INTVAL (cur_offset); if (GET_CODE (operands[i]) == SUBREG) { tmp = SUBREG_REG (operands[i]); gcc_assert (GET_MODE (operands[i]) == GET_MODE (tmp)); operands[i] = tmp; } } /* Make sure there is no dependency between the individual loads. */ if (load && REGNO (operands[0]) == REGNO (base)) return false; /* RAW. */ if (load && REGNO (operands[0]) == REGNO (operands[1])) return false; /* WAW. */ /* Make sure the instructions are ordered with lower memory access first. */ if (offsets[0] > offsets[1]) { gap = offsets[0] - offsets[1]; offset = offsets[1]; /* Swap the instructions such that lower memory is accessed first. */ std::swap (operands[0], operands[1]); std::swap (operands[2], operands[3]); } else { gap = offsets[1] - offsets[0]; offset = offsets[0]; } /* Make sure accesses are to consecutive memory locations. */ if (gap != 4) return false; /* Make sure we generate legal instructions. */ if (operands_ok_ldd_std (operands[0], operands[1], offset)) return true; if (load && commute) { /* Try reordering registers. */ std::swap (operands[0], operands[1]); if (operands_ok_ldd_std (operands[0], operands[1], offset)) return true; } return false; } /* This order of allocation is used when we compile for size. It allocates first the registers which are most probably to end up in a short instruction. */ static const int size_alloc_order[] = { 0, 1, 2, 3, 12, 13, 14, 15, 4, 5, 6, 7, 8, 9, 10, 11 }; /* Adjust register allocation order when compiling for size. */ void arc_adjust_reg_alloc_order (void) { const int arc_default_alloc_order[] = REG_ALLOC_ORDER; memcpy (reg_alloc_order, arc_default_alloc_order, sizeof (reg_alloc_order)); if (optimize_size) memcpy (reg_alloc_order, size_alloc_order, sizeof (size_alloc_order)); } /* Implement TARGET_MEMORY_MOVE_COST. */ static int arc_memory_move_cost (machine_mode mode, reg_class_t rclass ATTRIBUTE_UNUSED, bool in ATTRIBUTE_UNUSED) { if ((GET_MODE_SIZE (mode) <= UNITS_PER_WORD) || ((GET_MODE_SIZE (mode) <= UNITS_PER_WORD * 2) && TARGET_LL64)) return 6; return (2 * GET_MODE_SIZE (mode)); } /* Split an OR instruction into multiple BSET/OR instructions in a attempt to avoid long immediate constants. The next strategies are employed when destination is 'q' reg. 1. if there are up to three bits set in the mask, a succession of three bset instruction will be emitted: OR rA, rB, mask -> BSET(_S) rA,rB,mask1/BSET_S rA,rA,mask2/BSET_S rA,rA,mask3 2. if the lower 6 bits of the mask is set and there is only one bit set in the upper remaining bits then we will emit one bset and one OR instruction: OR rA, rB, mask -> OR rA,rB,mask1/BSET_S rA,mask2 3. otherwise an OR with limm will be emmitted. */ void arc_split_ior (rtx *operands) { unsigned HOST_WIDE_INT mask, maskx; rtx op1 = operands[1]; gcc_assert (CONST_INT_P (operands[2])); mask = INTVAL (operands[2]) & 0xffffffff; if (__builtin_popcount (mask) > 3 || (mask & 0x3f)) { maskx = mask & 0x3f; emit_insn (gen_rtx_SET (operands[0], gen_rtx_IOR (SImode, op1, GEN_INT (maskx)))); op1 = operands[0]; mask &= ~maskx; } switch (__builtin_popcount (mask)) { case 3: maskx = 1 << (__builtin_ffs (mask) - 1); emit_insn (gen_rtx_SET (operands[0], gen_rtx_IOR (SImode, op1, GEN_INT (maskx)))); mask &= ~maskx; op1 = operands[0]; /* FALLTHRU */ case 2: maskx = 1 << (__builtin_ffs (mask) - 1); emit_insn (gen_rtx_SET (operands[0], gen_rtx_IOR (SImode, op1, GEN_INT (maskx)))); mask &= ~maskx; op1 = operands[0]; /* FALLTHRU */ case 1: maskx = 1 << (__builtin_ffs (mask) - 1); emit_insn (gen_rtx_SET (operands[0], gen_rtx_IOR (SImode, op1, GEN_INT (maskx)))); break; case 0: break; default: gcc_unreachable (); } } /* Helper to check C0x constraint. */ bool arc_check_ior_const (HOST_WIDE_INT ival) { unsigned int mask = (unsigned int) (ival & 0xffffffff); if (UNSIGNED_INT6 (ival) || IS_POWEROF2_P (mask)) return false; if (__builtin_popcount (mask) <= 3) return true; if (__builtin_popcount (mask & ~0x3f) <= 1) return true; return false; } /* Split a mov with long immediate instruction into smaller, size friendly instructions. */ bool arc_split_mov_const (rtx *operands) { unsigned HOST_WIDE_INT ival; HOST_WIDE_INT shimm; machine_mode mode = GET_MODE (operands[0]); /* Manage a constant. */ gcc_assert (CONST_INT_P (operands[1])); ival = INTVAL (operands[1]) & 0xffffffff; /* 1. Check if we can just rotate limm by 8 but using ROR8. */ if (TARGET_BARREL_SHIFTER && TARGET_V2 && ((ival & ~0x3f000000) == 0)) { shimm = (ival >> 24) & 0x3f; emit_insn (gen_rtx_SET (operands[0], gen_rtx_ROTATERT (mode, GEN_INT (shimm), GEN_INT (8)))); return true; } /* 2. Check if we can just shift by 8 to fit into the u6 of LSL8. */ if (TARGET_BARREL_SHIFTER && TARGET_V2 && ((ival & ~0x3f00) == 0)) { shimm = (ival >> 8) & 0x3f; emit_insn (gen_rtx_SET (operands[0], gen_rtx_ASHIFT (mode, GEN_INT (shimm), GEN_INT (8)))); return true; } /* 3. Check if we can just shift by 16 to fit into the u6 of LSL16. */ if (TARGET_BARREL_SHIFTER && TARGET_V2 && ((ival & ~0x3f0000) == 0)) { shimm = (ival >> 16) & 0x3f; emit_insn (gen_rtx_SET (operands[0], gen_rtx_ASHIFT (mode, GEN_INT (shimm), GEN_INT (16)))); return true; } /* 4. Check if we can do something like mov_s h,u8 / asl_s ra,h,#nb. */ if (((ival >> (__builtin_ffs (ival) - 1)) & 0xffffff00) == 0 && TARGET_BARREL_SHIFTER) { HOST_WIDE_INT shift = __builtin_ffs (ival); shimm = (ival >> (shift - 1)) & 0xff; emit_insn (gen_rtx_SET (operands[0], GEN_INT (shimm))); emit_insn (gen_rtx_SET (operands[0], gen_rtx_ASHIFT (mode, operands[0], GEN_INT (shift - 1)))); return true; } /* 5. Check if we can just rotate the limm, useful when no barrel shifter is present. */ if ((ival & ~0x8000001f) == 0) { shimm = (ival * 2 + 1) & 0x3f; emit_insn (gen_rtx_SET (operands[0], gen_rtx_ROTATERT (mode, GEN_INT (shimm), const1_rtx))); return true; } /* 6. Check if we can do something with bmask. */ if (IS_POWEROF2_P (ival + 1)) { emit_insn (gen_rtx_SET (operands[0], constm1_rtx)); emit_insn (gen_rtx_SET (operands[0], gen_rtx_AND (mode, operands[0], GEN_INT (ival)))); return true; } gcc_unreachable (); } /* Helper to check Cax constraint. */ bool arc_check_mov_const (HOST_WIDE_INT ival) { ival = ival & 0xffffffff; if (SIGNED_INT12 (ival)) return false; if ((ival & ~0x8000001f) == 0) return true; if (IS_POWEROF2_P (ival + 1)) return true; /* The next rules requires a barrel shifter. */ if (!TARGET_BARREL_SHIFTER) return false; if (((ival >> (__builtin_ffs (ival) - 1)) & 0xffffff00) == 0) return true; if ((ival & ~0x3f00) == 0) return true; if ((ival & ~0x3f0000) == 0) return true; if ((ival & ~0x3f000000) == 0) return true; return false; } /* Return nonzero if this function is known to have a null epilogue. This allows the optimizer to omit jumps to jumps if no stack was created. */ bool arc_can_use_return_insn (void) { return (reload_completed && cfun->machine->frame_info.total_size == 0 && !ARC_INTERRUPT_P (arc_compute_function_type (cfun))); } /* Helper for INSN_COST. Per Segher Boessenkool: rtx_costs computes the cost for any rtx (an insn, a set, a set source, any random piece of one). set_src_cost, set_rtx_cost, etc. are helper functions that use that. Those functions do not work for parallels. Also, costs are not additive like this simplified model assumes. Also, more complex backends tend to miss many cases in their rtx_costs function. Many passes that want costs want to know the cost of a full insn. Like combine. That's why I created insn_cost: it solves all of the above problems. */ static int arc_insn_cost (rtx_insn *insn, bool speed) { int cost; if (recog_memoized (insn) < 0) return 0; /* If optimizing for size, we want the insn size. */ if (!speed) return get_attr_length (insn); /* Use cost if provided. */ cost = get_attr_cost (insn); if (cost > 0) return cost; /* For speed make a simple cost model: memory access is more expensive than any other instruction. */ enum attr_type type = get_attr_type (insn); switch (type) { case TYPE_LOAD: case TYPE_STORE: cost = COSTS_N_INSNS (2); break; default: cost = COSTS_N_INSNS (1); break; } return cost; } #undef TARGET_USE_ANCHORS_FOR_SYMBOL_P #define TARGET_USE_ANCHORS_FOR_SYMBOL_P arc_use_anchors_for_symbol_p #undef TARGET_CONSTANT_ALIGNMENT #define TARGET_CONSTANT_ALIGNMENT constant_alignment_word_strings #undef TARGET_CANNOT_SUBSTITUTE_MEM_EQUIV_P #define TARGET_CANNOT_SUBSTITUTE_MEM_EQUIV_P arc_cannot_substitute_mem_equiv_p #undef TARGET_ASM_TRAMPOLINE_TEMPLATE #define TARGET_ASM_TRAMPOLINE_TEMPLATE arc_asm_trampoline_template #undef TARGET_HAVE_SPECULATION_SAFE_VALUE #define TARGET_HAVE_SPECULATION_SAFE_VALUE speculation_safe_value_not_needed #undef TARGET_REGISTER_MOVE_COST #define TARGET_REGISTER_MOVE_COST arc_register_move_cost #undef TARGET_MEMORY_MOVE_COST #define TARGET_MEMORY_MOVE_COST arc_memory_move_cost #undef TARGET_INSN_COST #define TARGET_INSN_COST arc_insn_cost struct gcc_target targetm = TARGET_INITIALIZER; #include "gt-arc.h"