63 lines
1.7 KiB
C
63 lines
1.7 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) 2010 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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#include "nmod_poly.h"
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mp_limb_t
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_nmod_poly_evaluate_nmod(mp_srcptr poly, slong len, mp_limb_t c, nmod_t mod)
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{
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slong m;
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mp_limb_t val;
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if (len == 0)
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return 0;
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if (len == 1 || c == 0)
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return poly[0];
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m = len - 1;
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val = poly[m];
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m--;
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for ( ; m >= 0; m--)
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{
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val = n_mulmod2_preinv(val, c, mod.n, mod.ninv);
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val = n_addmod(val, poly[m], mod.n);
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}
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return val;
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}
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mp_limb_t
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nmod_poly_evaluate_nmod(const nmod_poly_t poly, mp_limb_t c)
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{
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return _nmod_poly_evaluate_nmod(poly->coeffs, poly->length, c, poly->mod);
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}
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