/* Test file for mpfr_atan2u. Copyright 2021-2023 Free Software Foundation, Inc. Contributed by the AriC and Caramba projects, INRIA. This file is part of the GNU MPFR Library. The GNU MPFR Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. The GNU MPFR Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "mpfr-test.h" #define TEST_FUNCTION mpfr_atan2u #define THREE_ARGS #include "tgeneric.c" /* Special cases from IEEE 754-2019 (page 63) */ static void check_ieee754 (void) { mpfr_t x, y, z; int i; mpfr_prec_t prec = 2; /* we need at least 2 so that 3/4 is exact */ mpfr_init2 (x, prec); mpfr_init2 (y, prec); mpfr_init2 (z, prec); /* atan2Pi(±0, −0) is ±1 */ mpfr_set_zero (x, -1); mpfr_set_zero (y, +1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_ui (z, 1) != 0) { printf ("Error for atan2u(+0,-0,2)\n"); printf ("expected 1\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_zero (y, -1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_si (z, -1) != 0) { printf ("Error for atan2u(-0,-0,2)\n"); printf ("expected -1\n"); printf ("got "); mpfr_dump (z); exit (1); } /* atan2Pi(±0, +0) is ±0 */ mpfr_set_zero (x, +1); mpfr_set_zero (y, +1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (!MPFR_IS_ZERO(z) || MPFR_IS_NEG(z)) { printf ("Error for atan2u(+0,+0,2)\n"); printf ("expected +0\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_zero (y, -1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (!MPFR_IS_ZERO(z) || MPFR_IS_POS(z)) { printf ("Error for atan2u(-0,+0,2)\n"); printf ("expected -0\n"); printf ("got "); mpfr_dump (z); exit (1); } /* atan2Pi(±0, x) is ±1 for x < 0 (including x=-Inf) */ for (i = 0; i < 2; i++) { if (i == 0) mpfr_set_si (x, -1, MPFR_RNDN); else mpfr_set_inf (x, -1); mpfr_set_zero (y, +1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_ui (z, 1) != 0) { printf ("Error for atan2u(+0,x,2)\nwith x = "); mpfr_dump (x); printf ("expected 1\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_zero (y, -1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_si (z, -1) != 0) { printf ("Error for atan2u(-0,x,2)\nwith x = "); mpfr_dump (x); printf ("expected -1\n"); printf ("got "); mpfr_dump (z); exit (1); } } /* atan2Pi(±0, x) is ±0 for x > 0 (including x=+Inf) */ for (i = 0; i < 2; i++) { if (i == 0) mpfr_set_ui (x, 1, MPFR_RNDN); else mpfr_set_inf (x, 1); mpfr_set_zero (y, +1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (!MPFR_IS_ZERO(z) || MPFR_IS_NEG(z)) { printf ("Error for atan2u(+0,x,2)\nwith x = "); mpfr_dump (x); printf ("expected +0\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_zero (y, -1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (!MPFR_IS_ZERO(z) || MPFR_IS_POS(z)) { printf ("Error for atan2u(-0,x,2)\nwith x = "); mpfr_dump (x); printf ("expected -0\n"); printf ("got "); mpfr_dump (z); exit (1); } } /* atan2Pi(y, ±0) is −½ for y < 0 */ mpfr_set_si (y, -1, MPFR_RNDN); mpfr_set_zero (x, 1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_si_2exp (z, -1, -1) != 0) { printf ("Error for atan2u(-1,+0,2)\n"); printf ("expected -1/2\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_zero (x, -1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_si_2exp (z, -1, -1) != 0) { printf ("Error for atan2u(-1,-0,2)\n"); printf ("expected -1/2\n"); printf ("got "); mpfr_dump (z); exit (1); } /* atan2Pi(y, ±0) is +½ for y > 0 */ mpfr_set_ui (y, 1, MPFR_RNDN); mpfr_set_zero (x, 1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_ui_2exp (z, 1, -1) != 0) { printf ("Error for atan2u(1,+0,2)\n"); printf ("expected 1/2\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_zero (x, -1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_ui_2exp (z, 1, -1) != 0) { printf ("Error for atan2u(-1,-0,2)\n"); printf ("expected 1/2\n"); printf ("got "); mpfr_dump (z); exit (1); } /* atan2Pi(±y, −∞) is ±1 for finite y > 0 */ mpfr_set_inf (x, -1); mpfr_set_ui (y, 1, MPFR_RNDN); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_ui (z, 1) != 0) { printf ("Error for atan2u(1,-Inf,2)\n"); printf ("expected 1\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_si (y, -1, MPFR_RNDN); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_si (z, -1) != 0) { printf ("Error for atan2u(-1,-Inf,2)\n"); printf ("expected -1\n"); printf ("got "); mpfr_dump (z); exit (1); } /* atan2Pi(±y, +∞) is ±0 for finite y > 0 */ mpfr_set_inf (x, +1); mpfr_set_ui (y, 1, MPFR_RNDN); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (!MPFR_IS_ZERO(z) || MPFR_IS_NEG(z)) { printf ("Error for atan2u(1,+Inf,2)\n"); printf ("expected +0\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_si (y, -1, MPFR_RNDN); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (!MPFR_IS_ZERO(z) || MPFR_IS_POS(z)) { printf ("Error for atan2u(-1,+Inf,2)\n"); printf ("expected -0\n"); printf ("got "); mpfr_dump (z); exit (1); } /* atan2Pi(±∞, x) is ±½ for finite x */ for (i = 0; i < 4; i++) { if (i == 0) mpfr_set_ui (x, 1, MPFR_RNDN); else if (i == 1) mpfr_set_zero (x, 1); else if (i == 2) mpfr_set_zero (x, -1); else mpfr_set_si (x, -1, MPFR_RNDN); mpfr_set_inf (y, 1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_ui_2exp (z, 1, -1) != 0) { printf ("Error for atan2u(+Inf,x,2)\nwith x = "); mpfr_dump (x); printf ("expected 1/2\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_inf (y, -1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_si_2exp (z, -1, -1) != 0) { printf ("Error for atan2u(-Inf,x,2)\nwith x = "); mpfr_dump (x); printf ("expected -1/2\n"); printf ("got "); mpfr_dump (z); exit (1); } } /* atan2Pi(±∞, −∞) is ±¾ */ mpfr_set_inf (x, -1); mpfr_set_inf (y, 1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_ui_2exp (z, 3, -2) != 0) { printf ("Error for atan2u(+Inf,-Inf,2)\n"); printf ("expected 3/4\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_inf (y, -1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_si_2exp (z, -3, -2) != 0) { printf ("Error for atan2u(+Inf,-Inf,2)\n"); printf ("expected -3/4\n"); printf ("got "); mpfr_dump (z); exit (1); } /* atan2Pi(±∞, +∞) is ±¼ */ mpfr_set_inf (x, 1); mpfr_set_inf (y, 1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_ui_2exp (z, 1, -2) != 0) { printf ("Error for atan2u(+Inf,+Inf,2)\n"); printf ("expected 1/4\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_inf (y, -1); mpfr_atan2u (z, y, x, 2, MPFR_RNDN); if (mpfr_cmp_si_2exp (z, -1, -2) != 0) { printf ("Error for atan2u(+Inf,+Inf,2)\n"); printf ("expected -1/4\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_clear (x); mpfr_clear (y); mpfr_clear (z); } /* Special cases from LIA-2 (5.3.9.15) not covered by IEEE 754-2019. Warning: in LIA-2, the order of arguments is reversed: arcu (u,x,y) corresponds to atan2u (y,x,u). */ static void check_lia2 (void) { mpfr_t x, y, z; mpfr_prec_t prec = 9; /* 3*99 must be exactly representable */ unsigned long u; int r, inex; mpfr_init2 (x, prec); mpfr_init2 (y, prec); mpfr_init2 (z, prec); /* arcu (u, x, x) = u/8 for x > 0 */ for (u = 1; u < 100; u++) RND_LOOP (r) { mpfr_set_ui (x, 1, MPFR_RNDN); /* exact */ mpfr_set_ui (y, 1, MPFR_RNDN); /* exact */ mpfr_atan2u (z, y, x, u, (mpfr_rnd_t) r); inex = mpfr_set_ui (x, u, MPFR_RNDN); MPFR_ASSERTN(inex == 0); inex = mpfr_div_ui (x, x, 8, (mpfr_rnd_t) r); if ((r != MPFR_RNDF || inex == 0) && !mpfr_equal_p (x, z)) { printf ("Error: atan2u(1,1,u) != u/8 for u=%lu and rnd=%s\n", u, mpfr_print_rnd_mode ((mpfr_rnd_t) r)); printf ("got: "); mpfr_dump (z); exit (1); } } /* arcu (u, x, -x) = -u/8 for x > 0 */ for (u = 1; u < 100; u++) RND_LOOP (r) { mpfr_set_ui (x, 1, MPFR_RNDN); /* exact */ mpfr_set_si (y, -1, MPFR_RNDN); /* exact */ mpfr_atan2u (z, y, x, u, (mpfr_rnd_t) r); inex = mpfr_set_ui (x, u, MPFR_RNDN); MPFR_ASSERTN(inex == 0); inex = mpfr_div_si (x, x, -8, (mpfr_rnd_t) r); if ((r != MPFR_RNDF || inex == 0) && !mpfr_equal_p (x, z)) { printf ("Error: atan2u(-1,1,u) != -u/8 for u=%lu and rnd=%s\n", u, mpfr_print_rnd_mode ((mpfr_rnd_t) r)); printf ("got: "); mpfr_dump (z); exit (1); } } /* arcu (u, x, −x) = 3 · u/8 for x < 0 */ for (u = 1; u < 100; u++) RND_LOOP (r) { mpfr_set_si (x, -1, MPFR_RNDN); /* exact */ mpfr_set_ui (y, 1, MPFR_RNDN); /* exact */ mpfr_atan2u (z, y, x, u, (mpfr_rnd_t) r); inex = mpfr_set_ui (x, 3 * u, MPFR_RNDN); MPFR_ASSERTN(inex == 0); inex = mpfr_div_ui (x, x, 8, (mpfr_rnd_t) r); if ((r != MPFR_RNDF || inex == 0) && !mpfr_equal_p (x, z)) { printf ("Error: atan2u(1,-1,u) != 3u/8 for u=%lu and rnd=%s\n", u, mpfr_print_rnd_mode ((mpfr_rnd_t) r)); printf ("got: "); mpfr_dump (z); exit (1); } } /* arcu (u, x, x) = -3 · u/8 for x < 0 */ for (u = 1; u < 100; u++) RND_LOOP (r) { mpfr_set_si (x, -1, MPFR_RNDN); /* exact */ mpfr_set_si (y, -1, MPFR_RNDN); /* exact */ mpfr_atan2u (z, y, x, u, (mpfr_rnd_t) r); inex = mpfr_set_ui (x, 3 * u, MPFR_RNDN); MPFR_ASSERTN(inex == 0); inex = mpfr_div_si (x, x, -8, (mpfr_rnd_t) r); if ((r != MPFR_RNDF || inex == 0) && !mpfr_equal_p (x, z)) { printf ("Error: atan2u(-1,-1,u) != -3u/8 for u=%lu and rnd=%s\n", u, mpfr_print_rnd_mode ((mpfr_rnd_t) r)); printf ("got: "); mpfr_dump (z); exit (1); } } mpfr_clear (x); mpfr_clear (y); mpfr_clear (z); } static void check_random (void) { mpfr_t x, y, z; long i, j, B = 20; unsigned long u; int r; mpfr_init2 (x, 53); mpfr_init2 (y, 53); mpfr_init2 (z, 53); /* hard-coded values */ /* first quadrant */ mpfr_set_ui (x, 17, MPFR_RNDN); mpfr_set_ui (y, 42, MPFR_RNDN); mpfr_atan2u (z, y, x, 360, MPFR_RNDN); /* in degrees */ mpfr_set_str (x, "4.3f6b9d4ccd754p+4", 16, MPFR_RNDN); if (!mpfr_equal_p (z, x)) { printf ("Error for atan2u(42,17,360)\n"); printf ("expected "); mpfr_dump (x); printf ("got "); mpfr_dump (z); exit (1); } /* second quadrant */ mpfr_set_si (x, -17, MPFR_RNDN); mpfr_set_ui (y, 42, MPFR_RNDN); mpfr_atan2u (z, y, x, 360, MPFR_RNDN); /* in degrees */ mpfr_set_str (x, "7.009462b3328acp+4", 16, MPFR_RNDN); if (!mpfr_equal_p (z, x)) { printf ("Error for atan2u(42,-17,360)\n"); printf ("expected "); mpfr_dump (x); printf ("got "); mpfr_dump (z); exit (1); } /* third quadrant */ mpfr_set_si (x, -17, MPFR_RNDN); mpfr_set_si (y, -42, MPFR_RNDN); mpfr_atan2u (z, y, x, 360, MPFR_RNDN); /* in degrees */ mpfr_set_str (x, "-7.009462b3328acp+4", 16, MPFR_RNDN); if (!mpfr_equal_p (z, x)) { printf ("Error for atan2u(-42,-17,360)\n"); printf ("expected "); mpfr_dump (x); printf ("got "); mpfr_dump (z); exit (1); } /* fourth quadrant */ mpfr_set_ui (x, 17, MPFR_RNDN); mpfr_set_si (y, -42, MPFR_RNDN); mpfr_atan2u (z, y, x, 360, MPFR_RNDN); /* in degrees */ mpfr_set_str (x, "-4.3f6b9d4ccd754p+4", 16, MPFR_RNDN); if (!mpfr_equal_p (z, x)) { printf ("Error for atan2u(-42,17,360)\n"); printf ("expected "); mpfr_dump (x); printf ("got "); mpfr_dump (z); exit (1); } /* case u=0 with x > 0 */ mpfr_set_ui (x, 17, MPFR_RNDN); mpfr_set_ui (y, 42, MPFR_RNDN); mpfr_atan2u (z, y, x, 0, MPFR_RNDN); if (!MPFR_IS_ZERO(z) || MPFR_IS_NEG(z)) { printf ("Error for atan2u(42,17,0)\n"); printf ("expected +0\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_si (y, -42, MPFR_RNDN); mpfr_atan2u (z, y, x, 0, MPFR_RNDN); if (!MPFR_IS_ZERO(z) || MPFR_IS_POS(z)) { printf ("Error for atan2u(-42,17,0)\n"); printf ("expected -0\n"); printf ("got "); mpfr_dump (z); exit (1); } /* case u=0 with x < 0 */ mpfr_set_si (x, -17, MPFR_RNDN); mpfr_set_ui (y, 42, MPFR_RNDN); mpfr_atan2u (z, y, x, 0, MPFR_RNDN); if (mpfr_cmp_ui (z, 1) != 0) { printf ("Error for atan2u(42,-17,0)\n"); printf ("expected +1\n"); printf ("got "); mpfr_dump (z); exit (1); } mpfr_set_si (y, -42, MPFR_RNDN); mpfr_atan2u (z, y, x, 0, MPFR_RNDN); if (mpfr_cmp_si (z, -1) != 0) { printf ("Error for atan2u(-42,-17,0)\n"); printf ("expected -1\n"); printf ("got "); mpfr_dump (z); exit (1); } for (i = -B; i <= B; i++) { mpfr_set_si (x, i, MPFR_RNDN); for (j = -B; j <= B; j++) { mpfr_set_si (y, j, MPFR_RNDN); for (u = 0; u <= B; u++) RND_LOOP (r) mpfr_atan2u (z, y, x, u, (mpfr_rnd_t) r); } } mpfr_clear (x); mpfr_clear (y); mpfr_clear (z); } /* bug found with GMP_CHECK_RANDOMIZE=1612368173909457 */ static void bug20210203 (void) { /* The "#if" makes sure that 64-bit constants are supported, avoiding a compilation failure. The "if" makes sure that the constant is representable in an unsigned long (this would not be the case with 32-bit unsigned long and 64-bit limb). */ #if GMP_NUMB_BITS >= 64 || MPFR_PREC_BITS >= 64 mpfr_t x, y, z; unsigned long u = 13484982567905493265U; if (u == 13484982567905493265U) { mpfr_init2 (x, 12); mpfr_init2 (y, 12); mpfr_init2 (z, 28); mpfr_set_str_binary (y, "-0.111101100000E-66"); mpfr_set_str_binary (x, "0.111011100000E0"); mpfr_atan2u (z, y, x, u, MPFR_RNDN); mpfr_set_prec (x, 28); mpfr_set_str_binary (x, "-0.1111011001001001000110001010E-5"); if (!mpfr_equal_p (z, x)) { printf ("Error in bug20210203\n"); printf ("expected "); mpfr_dump (x); printf ("got "); mpfr_dump (z); exit (1); } mpfr_clear (x); mpfr_clear (y); mpfr_clear (z); } #endif } int main (void) { tests_start_mpfr (); bug20210203 (); check_ieee754 (); check_lia2 (); check_random (); test_generic (MPFR_PREC_MIN, 100, 100); tests_end_mpfr (); return 0; }