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/* test mpz_divisible_p and mpz_divisible_ui_p
Copyright 2001, 2009 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"
void
check_one (mpz_srcptr a, mpz_srcptr d, int want)
{
int got;
if (mpz_fits_ulong_p (d))
{
unsigned long u = mpz_get_ui (d);
got = (mpz_divisible_ui_p (a, u) != 0);
if (want != got)
{
printf ("mpz_divisible_ui_p wrong\n");
printf (" expected %d got %d\n", want, got);
mpz_trace (" a", a);
printf (" d=%lu\n", u);
mp_trace_base = -16;
mpz_trace (" a", a);
printf (" d=0x%lX\n", u);
abort ();
}
}
got = (mpz_divisible_p (a, d) != 0);
if (want != got)
{
printf ("mpz_divisible_p wrong\n");
printf (" expected %d got %d\n", want, got);
mpz_trace (" a", a);
mpz_trace (" d", d);
mp_trace_base = -16;
mpz_trace (" a", a);
mpz_trace (" d", d);
abort ();
}
}
void
check_data (void)
{
static const struct {
const char *a;
const char *d;
int want;
} data[] = {
{ "0", "0", 1 },
{ "17", "0", 0 },
{ "0", "1", 1 },
{ "123", "1", 1 },
{ "-123", "1", 1 },
{ "0", "2", 1 },
{ "1", "2", 0 },
{ "2", "2", 1 },
{ "-2", "2", 1 },
{ "0x100000000000000000000000000000000", "2", 1 },
{ "0x100000000000000000000000000000001", "2", 0 },
{ "0x3333333333333333", "3", 1 },
{ "0x3333333333333332", "3", 0 },
{ "0x33333333333333333333333333333333", "3", 1 },
{ "0x33333333333333333333333333333332", "3", 0 },
/* divisor changes from 2 to 1 limb after stripping 2s */
{ "0x3333333300000000", "0x180000000", 1 },
{ "0x33333333333333330000000000000000", "0x18000000000000000", 1 },
{ "0x133333333333333330000000000000000", "0x18000000000000000", 0 },
};
mpz_t a, d;
int i;
mpz_init (a);
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 (d, data[i].d, 0);
check_one (a, d, data[i].want);
}
mpz_clear (a);
mpz_clear (d);
}
void
check_random (int reps)
{
gmp_randstate_ptr rands = RANDS;
mpz_t a, d, r;
int i;
int want;
mpz_init (a);
mpz_init (d);
mpz_init (r);
for (i = 0; i < reps; i++)
{
mpz_erandomb (a, rands, 1 << 19);
mpz_erandomb_nonzero (d, rands, 1 << 18);
mpz_fdiv_r (r, a, d);
want = (mpz_sgn (r) == 0);
check_one (a, d, want);
mpz_sub (a, a, r);
check_one (a, d, 1);
if (mpz_cmpabs_ui (d, 1L) == 0)
continue;
mpz_add_ui (a, a, 1L);
check_one (a, d, 0);
}
mpz_clear (a);
mpz_clear (d);
mpz_clear (r);
}
int
main (int argc, char *argv[])
{
int reps = 100;
tests_start ();
TESTS_REPS (reps, argv, argc);
check_data ();
check_random (reps);
tests_end ();
exit (0);
}
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