119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
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/*=============================================================================
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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 "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, a2, b, q, r, q2;
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gmp_randstate_t st;
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mp_limb_t d1, d2, inv;
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slong s1, s2;
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FLINT_TEST_INIT(state);
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flint_printf("divrem_preinv1....");
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fflush(stdout);
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mpz_init(a);
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mpz_init(a2);
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mpz_init(b);
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mpz_init(q);
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mpz_init(r);
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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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do {
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mpz_rrandomb(a, st, n_randint(state, 200));
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do {
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mpz_rrandomb(b, st, n_randint(state, 200));
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} while (mpz_sgn(b) == 0);
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s1 = a->_mp_size;
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s2 = b->_mp_size;
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} while (s1 < s2 || s2 < 2);
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mpz_set(a2, a);
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/* normalise b */
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b->_mp_d[b->_mp_size - 1] |= ((mp_limb_t) 1 << (GMP_LIMB_BITS - 1));
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d1 = b->_mp_d[b->_mp_size - 1];
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d2 = b->_mp_d[b->_mp_size - 2];
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mpz_fdiv_qr(q, r, a, b);
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inv = flint_mpn_preinv1(d1, d2);
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q2->_mp_d = flint_malloc((s1 - s2 + 1)*sizeof(mp_limb_t));
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q2->_mp_d[s1 - s2] = flint_mpn_divrem_preinv1(q2->_mp_d, a2->_mp_d, a2->_mp_size, b->_mp_d, b->_mp_size, inv);
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/* normalise */
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s1 -= (s2 - 1);
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while (s1 && q2->_mp_d[s1 - 1] == 0) s1--;
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q2->_mp_size = s1;
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q2->_mp_alloc = s1;
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while (s2 && a2->_mp_d[s2 - 1] == 0) s2--;
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a2->_mp_size = s2;
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result = (mpz_cmp(q, q2) == 0 && mpz_cmp(a2, r) == 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", q);
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gmp_printf("%Zd\n", r);
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gmp_printf("%Zd\n", q2);
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gmp_printf("%Zd\n", a2);
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abort();
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}
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flint_free(q2->_mp_d);
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}
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mpz_clear(a);
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mpz_clear(a2);
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mpz_clear(b);
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mpz_clear(q);
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mpz_clear(r);
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/* don't clear g */
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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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