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/* 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 <stdio.h>
#include <stdlib.h>
#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;
}
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