59 lines
1.8 KiB
C
59 lines
1.8 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) 2009 William Hart
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******************************************************************************/
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#include <gmp.h>
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#include "flint.h"
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#include "ulong_extras.h"
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mp_limb_t n_factor_trial_partial(n_factor_t * factors, mp_limb_t n, mp_limb_t * prod, ulong num_primes, mp_limb_t limit)
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{
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unsigned int exp;
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mp_limb_t p;
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double ppre;
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ulong i;
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const mp_limb_t * primes;
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const double * inverses;
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(*prod) = 1;
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primes = n_primes_arr_readonly(num_primes);
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inverses = n_prime_inverses_arr_readonly(num_primes);
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for (i = 0; i < num_primes; i++)
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{
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p = primes[i];
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if (p*p > n) break;
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ppre = inverses[i];
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exp = n_remove2_precomp(&n, p, ppre);
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if (exp)
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{
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n_factor_insert(factors, p, exp);
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(*prod) *= n_pow(p, exp);
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if (*prod > limit) break;
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}
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}
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return n;
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}
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