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/* test mpz_congruent_p and mpz_congruent_ui_p
Copyright 2001, 2002 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP 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 MP 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 MP Library. If not, see http://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, mpz_srcptr d, int want)
{
int got;
int swap;
for (swap = 0; swap <= 1; swap++)
{
got = (mpz_congruent_p (a, c, d) != 0);
if (want != got)
{
printf ("mpz_congruent_p wrong\n");
printf (" expected %d got %d\n", want, got);
mpz_trace (" a", a);
mpz_trace (" c", c);
mpz_trace (" d", d);
mp_trace_base = -16;
mpz_trace (" a", a);
mpz_trace (" c", c);
mpz_trace (" d", d);
abort ();
}
if (mpz_fits_ulong_p (c) && mpz_fits_ulong_p (d))
{
unsigned long uc = mpz_get_ui (c);
unsigned long ud = mpz_get_ui (d);
got = (mpz_congruent_ui_p (a, uc, ud) != 0);
if (want != got)
{
printf ("mpz_congruent_ui_p wrong\n");
printf (" expected %d got %d\n", want, got);
mpz_trace (" a", a);
printf (" c=%lu\n", uc);
printf (" d=%lu\n", ud);
mp_trace_base = -16;
mpz_trace (" a", a);
printf (" c=0x%lX\n", uc);
printf (" d=0x%lX\n", ud);
abort ();
}
}
MPZ_SRCPTR_SWAP (a, c);
}
}
void
check_data (void)
{
static const struct {
const char *a;
const char *c;
const char *d;
int want;
} data[] = {
/* anything congruent mod 1 */
{ "0", "0", "1", 1 },
{ "1", "0", "1", 1 },
{ "0", "1", "1", 1 },
{ "123", "456", "1", 1 },
{ "0x123456789123456789", "0x987654321987654321", "1", 1 },
/* csize==1, dsize==2 changing to 1 after stripping 2s */
{ "0x3333333333333333", "0x33333333",
"0x180000000", 1 },
{ "0x33333333333333333333333333333333", "0x3333333333333333",
"0x18000000000000000", 1 },
/* another dsize==2 becoming 1, with opposite signs this time */
{ "0x444444441",
"-0x22222221F",
"0x333333330", 1 },
{ "0x44444444444444441",
"-0x2222222222222221F",
"0x33333333333333330", 1 },
};
mpz_t a, c, d;
int i;
mpz_init (a);
mpz_init (c);
mpz_init (d);
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);
mpz_set_str_or_abort (d, data[i].d, 0);
check_one (a, c, d, data[i].want);
}
mpz_clear (a);
mpz_clear (c);
mpz_clear (d);
}
void
check_random (int argc, char *argv[])
{
gmp_randstate_ptr rands = RANDS;
mpz_t a, c, d, ra, rc;
int i;
int want;
int reps = 50000;
if (argc >= 2)
reps = atoi (argv[1]);
mpz_init (a);
mpz_init (c);
mpz_init (d);
mpz_init (ra);
mpz_init (rc);
for (i = 0; i < reps; i++)
{
mpz_errandomb (a, rands, 8*BITS_PER_MP_LIMB);
MPZ_CHECK_FORMAT (a);
mpz_errandomb (c, rands, 8*BITS_PER_MP_LIMB);
MPZ_CHECK_FORMAT (c);
mpz_errandomb_nonzero (d, rands, 8*BITS_PER_MP_LIMB);
mpz_negrandom (a, rands);
MPZ_CHECK_FORMAT (a);
mpz_negrandom (c, rands);
MPZ_CHECK_FORMAT (c);
mpz_negrandom (d, rands);
mpz_fdiv_r (ra, a, d);
mpz_fdiv_r (rc, c, d);
want = (mpz_cmp (ra, rc) == 0);
check_one (a, c, d, want);
mpz_sub (ra, ra, rc);
mpz_sub (a, a, ra);
MPZ_CHECK_FORMAT (a);
check_one (a, c, d, 1);
if (! mpz_pow2abs_p (d))
{
refmpz_combit (a, urandom() % (8*BITS_PER_MP_LIMB));
check_one (a, c, d, 0);
}
}
mpz_clear (a);
mpz_clear (c);
mpz_clear (d);
mpz_clear (ra);
mpz_clear (rc);
}
int
main (int argc, char *argv[])
{
tests_start ();
check_data ();
check_random (argc, argv);
tests_end ();
exit (0);
}
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