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/* test mpz_congruent_2exp_p */
/*
Copyright 2001, 2013 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.h"
#include "gmp-impl.h"
#include "tests.h"
void
check_one (mpz_srcptr a, mpz_srcptr c, unsigned long d, int want)
{
mpz_t diff, d2exp;
int got;
int swap;
for (swap = 0; swap <= 1; swap++)
{
got = (mpz_congruent_2exp_p (a, c, d) != 0);
if (want != got)
{
mpz_init (diff);
mpz_init (d2exp);
mpz_sub (diff, a, c);
mpz_set_ui (d2exp, 1L);
mpz_mul_2exp (d2exp, d2exp, d);
printf ("mpz_congruent_2exp_p wrong\n");
printf (" expected %d got %d\n", want, got);
mpz_trace (" a", a);
mpz_trace (" c", c);
mpz_trace (" a-c", diff);
mpz_trace (" 2^d", d2exp);
printf (" d=%lu\n", d);
mp_trace_base = -16;
mpz_trace (" a", a);
mpz_trace (" c", c);
mpz_trace (" a-c", diff);
mpz_trace (" 2^d", d2exp);
printf (" d=0x%lX\n", d);
abort ();
}
MPZ_SRCPTR_SWAP (a, c);
}
}
void
check_data (void)
{
static const struct {
const char *a;
const char *c;
unsigned long d;
int want;
} data[] = {
/* anything is congruent mod 1 */
{ "0", "0", 0, 1 },
{ "1", "0", 0, 1 },
{ "0", "1", 0, 1 },
{ "123", "-456", 0, 1 },
{ "0x123456789123456789", "0x987654321987654321", 0, 1 },
{ "0xfffffffffffffffffffffffffffffff7", "-0x9", 129, 0 },
{ "0xfffffffffffffffffffffffffffffff6", "-0xa", 128, 1 },
};
mpz_t a, c;
int i;
mpz_init (a);
mpz_init (c);
for (i = 0; i < numberof (data); i++)
{
mpz_set_str_or_abort (a, data[i].a, 0);
mpz_set_str_or_abort (c, data[i].c, 0);
check_one (a, c, data[i].d, data[i].want);
}
mpz_clear (a);
mpz_clear (c);
}
void
check_random (int reps)
{
gmp_randstate_ptr rands = RANDS;
unsigned long d;
mpz_t a, c, ra, rc;
int i;
mpz_init (a);
mpz_init (c);
mpz_init (ra);
mpz_init (rc);
for (i = 0; i < reps; i++)
{
mpz_errandomb (a, rands, 8*GMP_LIMB_BITS);
mpz_errandomb (c, rands, 8*GMP_LIMB_BITS);
d = urandom() % (8*GMP_LIMB_BITS);
mpz_mul_2exp (a, a, urandom() % (2*GMP_LIMB_BITS));
mpz_mul_2exp (c, c, urandom() % (2*GMP_LIMB_BITS));
mpz_negrandom (a, rands);
mpz_negrandom (c, rands);
mpz_fdiv_r_2exp (ra, a, d);
mpz_fdiv_r_2exp (rc, c, d);
mpz_sub (ra, ra, rc);
if (mpz_cmp_ui (ra, 0) != 0)
{
check_one (a, c, d, 0);
mpz_sub (a, a, ra);
}
check_one (a, c, d, 1);
if (d != 0)
{
mpz_combit (a, urandom() % d);
check_one (a, c, d, 0);
}
}
mpz_clear (a);
mpz_clear (c);
mpz_clear (ra);
mpz_clear (rc);
}
void
check_random_bits (int reps)
{
gmp_randstate_ptr rands = RANDS;
mp_bitcnt_t ea, ec, en, d;
mp_bitcnt_t m = 10 * GMP_LIMB_BITS;
mpz_t a, c;
int i;
mpz_init2 (a, m + 1);
mpz_init2 (c, m);
for (i = 0; i < reps; i++)
{
d = urandom() % m;
ea = urandom() % m;
ec = urandom() % m;
en = urandom() % m;
mpz_set_ui (c, 0);
mpz_setbit (c, en);
mpz_set_ui (a, 0);
mpz_setbit (a, ec);
mpz_sub (c , a, c);
mpz_set_ui (a, 0);
mpz_setbit (a, ea);
mpz_add (a , a, c);
check_one (a, c, d, ea >= d);
}
mpz_clear (a);
mpz_clear (c);
}
int
main (int argc, char *argv[])
{
int reps = 5000;
tests_start ();
TESTS_REPS (reps, argv, argc);
check_data ();
check_random (reps);
check_random_bits (reps);
tests_end ();
exit (0);
}
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