pqc/external/flint-2.4.3/mpn_extras/test/t-mulmod_preinvn.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
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_ptr dinv;
mp_size_t size;
mp_bitcnt_t norm;
FLINT_TEST_INIT(state);
flint_printf("mulmod_preinvn....");
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) + 1;
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);
dinv = flint_malloc(size*sizeof(mp_limb_t));
flint_mpn_preinvn(dinv, d->_mp_d, size);
r2->_mp_d = flint_malloc(size*sizeof(mp_limb_t));
flint_mpn_mulmod_preinvn(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);
flint_printf("size = %wd\n", size);
abort();
}
flint_free(r2->_mp_d);
flint_free(dinv);
}
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;
}