135 lines
3.1 KiB
C
135 lines
3.1 KiB
C
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/* Test mpn_gcdext_1.
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Copyright 2019 Free Software Foundation, Inc.
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This file is part of the GNU MP Library test suite.
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The GNU MP Library test suite is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the License,
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or (at your option) any later version.
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The GNU MP Library test suite is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along with
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the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "gmp-impl.h"
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#include "tests.h"
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#ifndef COUNT
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#define COUNT 250000
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#endif
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static void
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set_signed_limb (mpz_t r, mp_limb_signed_t x)
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{
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mpz_t t;
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mp_limb_t abs_x = ABS_CAST(mp_limb_t, x);
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mpz_set (r, mpz_roinit_n (t, &abs_x, 1));
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if (x < 0)
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mpz_neg (r, r);
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}
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static void
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one_test (mp_limb_t a, mp_limb_t b)
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{
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mp_limb_signed_t s, t;
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mp_limb_t g;
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g = mpn_gcdext_1 (&s, &t, a, b);
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if (g > 0)
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{
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mpz_t d, sz, tz, tmp;
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mpz_init (d);
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mpz_init (sz);
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mpz_init (tz);
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set_signed_limb (sz, s);
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set_signed_limb (tz, t);
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mpz_mul (d, mpz_roinit_n (tmp, &a, 1), sz);
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mpz_addmul (d, mpz_roinit_n (tmp, &b, 1), tz);
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if (mpz_cmp (d, mpz_roinit_n (tmp, &g, 1)) == 0
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&& a % g == 0 && b % g == 0)
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{
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mp_limb_t a_div_g = a / g;
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mp_limb_t b_div_g = b / g;
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mp_limb_t abs_s = ABS_CAST(mp_limb_t, s);
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mp_limb_t abs_t = ABS_CAST(mp_limb_t, t);
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mpz_mul_ui (sz, sz, 2);
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mpz_mul_ui (tz, tz, 2);
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if ((abs_s == 1 || mpz_cmpabs (sz, mpz_roinit_n (tmp, &b_div_g, 1)) < 0)
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&& (abs_t == 1 || mpz_cmpabs (tz, mpz_roinit_n (tmp, &a_div_g, 1)) < 0))
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{
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mpz_clear (d);
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mpz_clear (sz);
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mpz_clear (tz);
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return;
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}
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}
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}
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gmp_fprintf (stderr,
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"gcdext_1 (0x%Mx, 0x%Mx) failed, got: g = 0x%Mx, s = %s0x%Mx, t = %s0x%Mx\n",
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a, b, g,
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s < 0 ? "-" : "", ABS_CAST(mp_limb_t, s),
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t < 0 ? "-" : "", ABS_CAST(mp_limb_t, t));
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abort();
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}
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int
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main (int argc, char **argv)
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{
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mpz_t a, b;
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int count = COUNT;
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int test;
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gmp_randstate_ptr rands;
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TESTS_REPS (count, argv, argc);
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tests_start ();
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rands = RANDS;
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mpz_init (a);
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mpz_init (b);
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for (test = 0; test < count; test++)
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{
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mp_limb_t al, bl;
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mp_bitcnt_t asize = 1 + gmp_urandomm_ui(rands, GMP_NUMB_BITS);
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mp_bitcnt_t bsize = 1 + gmp_urandomm_ui(rands, GMP_NUMB_BITS);
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if (test & 1)
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{
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mpz_urandomb (a, rands, asize);
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mpz_urandomb (b, rands, bsize);
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}
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else
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{
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mpz_rrandomb (a, rands, asize);
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mpz_rrandomb (b, rands, bsize);
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}
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al = mpz_getlimbn (a, 0);
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bl = mpz_getlimbn (b, 0);
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al += (al == 0);
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bl += (bl == 0);
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one_test (al, bl);
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}
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mpz_clear (a);
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mpz_clear (b);
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tests_end ();
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return 0;
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}
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