68 lines
2.0 KiB
C
68 lines
2.0 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) 2008, 2009 William Hart
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Copyright (C) 2010 Sebastian Pancratz
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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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#include "fmpz.h"
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#include "fmpz_poly.h"
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mp_limb_t _fmpz_poly_evaluate_mod(const fmpz * poly, slong len, mp_limb_t a,
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mp_limb_t n, mp_limb_t ninv)
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{
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mp_limb_t c, res = 0;
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while (len--)
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{
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c = fmpz_fdiv_ui(poly + len, n);
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res = n_addmod(n_mulmod2_preinv(res, a, n, ninv), c, n);
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}
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return res;
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}
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mp_limb_t fmpz_poly_evaluate_mod(const fmpz_poly_t poly, mp_limb_t a,
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mp_limb_t n)
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{
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if (poly->length == 0)
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return 0;
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if (a == 0)
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{
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mp_limb_t res;
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res = fmpz_fdiv_ui(poly->coeffs, n);
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return res;
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}
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else
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{
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mp_limb_t ninv;
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ninv = n_preinvert_limb(n);
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return _fmpz_poly_evaluate_mod(poly->coeffs, poly->length, a, n, ninv);
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}
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}
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