From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001 From: Duncan Wilkie Date: Sat, 18 Nov 2023 06:11:09 -0600 Subject: Initial commit. --- gmp-6.3.0/tests/mpn/t-gcdext_1.c | 134 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 134 insertions(+) create mode 100644 gmp-6.3.0/tests/mpn/t-gcdext_1.c (limited to 'gmp-6.3.0/tests/mpn/t-gcdext_1.c') diff --git a/gmp-6.3.0/tests/mpn/t-gcdext_1.c b/gmp-6.3.0/tests/mpn/t-gcdext_1.c new file mode 100644 index 0000000..1e73a11 --- /dev/null +++ b/gmp-6.3.0/tests/mpn/t-gcdext_1.c @@ -0,0 +1,134 @@ +/* Test mpn_gcdext_1. + +Copyright 2019 Free Software Foundation, Inc. + +This file is part of the GNU MP Library test suite. + +The GNU MP Library test suite 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 of the License, +or (at your option) any later version. + +The GNU MP Library test suite 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 +the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */ + +#include +#include + +#include "gmp-impl.h" +#include "tests.h" + +#ifndef COUNT +#define COUNT 250000 +#endif + +static void +set_signed_limb (mpz_t r, mp_limb_signed_t x) +{ + mpz_t t; + mp_limb_t abs_x = ABS_CAST(mp_limb_t, x); + mpz_set (r, mpz_roinit_n (t, &abs_x, 1)); + if (x < 0) + mpz_neg (r, r); +} + +static void +one_test (mp_limb_t a, mp_limb_t b) +{ + mp_limb_signed_t s, t; + mp_limb_t g; + + g = mpn_gcdext_1 (&s, &t, a, b); + + if (g > 0) + { + mpz_t d, sz, tz, tmp; + + mpz_init (d); + mpz_init (sz); + mpz_init (tz); + + set_signed_limb (sz, s); + set_signed_limb (tz, t); + + mpz_mul (d, mpz_roinit_n (tmp, &a, 1), sz); + mpz_addmul (d, mpz_roinit_n (tmp, &b, 1), tz); + + if (mpz_cmp (d, mpz_roinit_n (tmp, &g, 1)) == 0 + && a % g == 0 && b % g == 0) + { + mp_limb_t a_div_g = a / g; + mp_limb_t b_div_g = b / g; + mp_limb_t abs_s = ABS_CAST(mp_limb_t, s); + mp_limb_t abs_t = ABS_CAST(mp_limb_t, t); + mpz_mul_ui (sz, sz, 2); + mpz_mul_ui (tz, tz, 2); + if ((abs_s == 1 || mpz_cmpabs (sz, mpz_roinit_n (tmp, &b_div_g, 1)) < 0) + && (abs_t == 1 || mpz_cmpabs (tz, mpz_roinit_n (tmp, &a_div_g, 1)) < 0)) + { + mpz_clear (d); + mpz_clear (sz); + mpz_clear (tz); + + return; + } + } + } + gmp_fprintf (stderr, + "gcdext_1 (0x%Mx, 0x%Mx) failed, got: g = 0x%Mx, s = %s0x%Mx, t = %s0x%Mx\n", + a, b, g, + s < 0 ? "-" : "", ABS_CAST(mp_limb_t, s), + t < 0 ? "-" : "", ABS_CAST(mp_limb_t, t)); + abort(); +} + +int +main (int argc, char **argv) +{ + mpz_t a, b; + int count = COUNT; + int test; + gmp_randstate_ptr rands; + + TESTS_REPS (count, argv, argc); + + tests_start (); + rands = RANDS; + + mpz_init (a); + mpz_init (b); + for (test = 0; test < count; test++) + { + mp_limb_t al, bl; + mp_bitcnt_t asize = 1 + gmp_urandomm_ui(rands, GMP_NUMB_BITS); + mp_bitcnt_t bsize = 1 + gmp_urandomm_ui(rands, GMP_NUMB_BITS); + if (test & 1) + { + mpz_urandomb (a, rands, asize); + mpz_urandomb (b, rands, bsize); + } + else + { + mpz_rrandomb (a, rands, asize); + mpz_rrandomb (b, rands, bsize); + } + + al = mpz_getlimbn (a, 0); + bl = mpz_getlimbn (b, 0); + al += (al == 0); + bl += (bl == 0); + + one_test (al, bl); + } + + mpz_clear (a); + mpz_clear (b); + + tests_end (); + return 0; +} -- cgit v1.2.3