119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
|
/*=============================================================================
|
||
|
|
|
||
|
|
This file is part of FLINT.
|
||
|
|
|
||
|
|
FLINT 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 2 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
FLINT 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 FLINT; if not, write to the Free Software
|
||
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
|
||
|
|
=============================================================================*/
|
||
|
|
/******************************************************************************
|
||
|
|
|
||
|
|
Copyright (C) 2013 William Hart
|
||
|
|
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <gmp.h>
|
||
|
|
#include "flint.h"
|
||
|
|
#include "longlong.h"
|
||
|
|
#include "mpn_extras.h"
|
||
|
|
#include "ulong_extras.h"
|
||
|
|
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
int i, result;
|
||
|
|
mpz_t a, b, d, r1, r2;
|
||
|
|
gmp_randstate_t st;
|
||
|
|
mp_limb_t d1, d2, dinv;
|
||
|
|
mp_size_t size;
|
||
|
|
mp_bitcnt_t norm;
|
||
|
|
|
||
|
|
FLINT_TEST_INIT(state);
|
||
|
|
|
||
|
|
flint_printf("mulmod_preinv1....");
|
||
|
|
fflush(stdout);
|
||
|
|
|
||
|
|
mpz_init(a);
|
||
|
|
mpz_init(b);
|
||
|
|
mpz_init(d);
|
||
|
|
mpz_init(r1);
|
||
|
|
/* don't init r2 */
|
||
|
|
|
||
|
|
gmp_randinit_default(st);
|
||
|
|
|
||
|
|
for (i = 0; i < 10000; i++)
|
||
|
|
{
|
||
|
|
size = n_randint(state, 200) + 2;
|
||
|
|
|
||
|
|
mpz_rrandomb(a, st, size*FLINT_BITS);
|
||
|
|
mpz_rrandomb(b, st, size*FLINT_BITS);
|
||
|
|
do {
|
||
|
|
mpz_rrandomb(d, st, size*FLINT_BITS);
|
||
|
|
} while (mpz_sgn(d) == 0);
|
||
|
|
|
||
|
|
/* reduce a, b mod d */
|
||
|
|
mpz_fdiv_r(a, a, d);
|
||
|
|
mpz_fdiv_r(b, b, d);
|
||
|
|
|
||
|
|
mpz_mul(r1, a, b);
|
||
|
|
mpz_fdiv_r(r1, r1, d);
|
||
|
|
|
||
|
|
/* normalise */
|
||
|
|
count_leading_zeros(norm, d->_mp_d[d->_mp_size - 1]);
|
||
|
|
mpz_mul_2exp(a, a, norm);
|
||
|
|
mpz_mul_2exp(b, b, norm);
|
||
|
|
mpz_mul_2exp(d, d, norm);
|
||
|
|
|
||
|
|
d1 = d->_mp_d[size - 1];
|
||
|
|
d2 = d->_mp_d[size - 2];
|
||
|
|
dinv = flint_mpn_preinv1(d1, d2);
|
||
|
|
|
||
|
|
r2->_mp_d = flint_malloc(size*sizeof(mp_limb_t));
|
||
|
|
|
||
|
|
flint_mpn_mulmod_preinv1(r2->_mp_d, a->_mp_d, b->_mp_d, size, d->_mp_d, dinv, norm);
|
||
|
|
|
||
|
|
/* normalise */
|
||
|
|
while (size && r2->_mp_d[size - 1] == 0) size--;
|
||
|
|
r2->_mp_size = size;
|
||
|
|
r2->_mp_alloc = size;
|
||
|
|
|
||
|
|
result = (mpz_cmp(r1, r2) == 0);
|
||
|
|
if (!result)
|
||
|
|
{
|
||
|
|
flint_printf("FAIL:\n");
|
||
|
|
gmp_printf("%Zd\n", a);
|
||
|
|
gmp_printf("%Zd\n", b);
|
||
|
|
gmp_printf("%Zd\n", d);
|
||
|
|
gmp_printf("%Zd\n", r1);
|
||
|
|
gmp_printf("%Zd\n", r2);
|
||
|
|
abort();
|
||
|
|
}
|
||
|
|
|
||
|
|
flint_free(r2->_mp_d);
|
||
|
|
}
|
||
|
|
|
||
|
|
mpz_clear(a);
|
||
|
|
mpz_clear(b);
|
||
|
|
mpz_clear(d);
|
||
|
|
mpz_clear(r1);
|
||
|
|
/* don't init r2 */
|
||
|
|
|
||
|
|
gmp_randclear(st);
|
||
|
|
FLINT_TEST_CLEANUP(state);
|
||
|
|
|
||
|
|
flint_printf("PASS\n");
|
||
|
|
return 0;
|
||
|
|
}
|