120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2013 William Hart
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******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <gmp.h>
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#include "flint.h"
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#include "longlong.h"
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#include "mpn_extras.h"
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#include "ulong_extras.h"
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int main(void)
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{
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int i, result;
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mpz_t a, b, d, r1, r2;
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gmp_randstate_t st;
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mp_ptr dinv;
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mp_size_t size;
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mp_bitcnt_t norm;
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FLINT_TEST_INIT(state);
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flint_printf("mulmod_preinvn....");
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fflush(stdout);
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mpz_init(a);
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mpz_init(b);
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mpz_init(d);
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mpz_init(r1);
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/* don't init r2 */
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gmp_randinit_default(st);
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for (i = 0; i < 10000; i++)
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{
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size = n_randint(state, 200) + 1;
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mpz_rrandomb(a, st, size*FLINT_BITS);
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mpz_rrandomb(b, st, size*FLINT_BITS);
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do {
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mpz_rrandomb(d, st, size*FLINT_BITS);
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} while (mpz_sgn(d) == 0);
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/* reduce a, b mod d */
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mpz_fdiv_r(a, a, d);
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mpz_fdiv_r(b, b, d);
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mpz_mul(r1, a, b);
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mpz_fdiv_r(r1, r1, d);
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/* normalise */
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count_leading_zeros(norm, d->_mp_d[d->_mp_size - 1]);
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mpz_mul_2exp(a, a, norm);
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mpz_mul_2exp(b, b, norm);
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mpz_mul_2exp(d, d, norm);
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dinv = flint_malloc(size*sizeof(mp_limb_t));
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flint_mpn_preinvn(dinv, d->_mp_d, size);
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r2->_mp_d = flint_malloc(size*sizeof(mp_limb_t));
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flint_mpn_mulmod_preinvn(r2->_mp_d, a->_mp_d, b->_mp_d, size, d->_mp_d, dinv, norm);
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/* normalise */
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while (size && r2->_mp_d[size - 1] == 0) size--;
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r2->_mp_size = size;
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r2->_mp_alloc = size;
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result = (mpz_cmp(r1, r2) == 0);
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if (!result)
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{
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flint_printf("FAIL:\n");
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gmp_printf("%Zd\n", a);
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gmp_printf("%Zd\n", b);
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gmp_printf("%Zd\n", d);
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gmp_printf("%Zd\n", r1);
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gmp_printf("%Zd\n", r2);
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flint_printf("size = %wd\n", size);
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abort();
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}
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flint_free(r2->_mp_d);
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flint_free(dinv);
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}
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mpz_clear(a);
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mpz_clear(b);
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mpz_clear(d);
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mpz_clear(r1);
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/* don't init r2 */
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gmp_randclear(st);
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FLINT_TEST_CLEANUP(state);
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flint_printf("PASS\n");
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return 0;
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}
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