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/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2008, 2009 William Hart
Copyright (C) 2010 Sebastian Pancratz
******************************************************************************/
#include <gmp.h>
#include "flint.h"
#include "ulong_extras.h"
#include "fmpz.h"
#include "fmpz_poly.h"
mp_limb_t _fmpz_poly_evaluate_mod(const fmpz * poly, slong len, mp_limb_t a,
mp_limb_t n, mp_limb_t ninv)
{
mp_limb_t c, res = 0;
while (len--)
{
c = fmpz_fdiv_ui(poly + len, n);
res = n_addmod(n_mulmod2_preinv(res, a, n, ninv), c, n);
}
return res;
}
mp_limb_t fmpz_poly_evaluate_mod(const fmpz_poly_t poly, mp_limb_t a,
mp_limb_t n)
{
if (poly->length == 0)
return 0;
if (a == 0)
{
mp_limb_t res;
res = fmpz_fdiv_ui(poly->coeffs, n);
return res;
}
else
{
mp_limb_t ninv;
ninv = n_preinvert_limb(n);
return _fmpz_poly_evaluate_mod(poly->coeffs, poly->length, a, n, ninv);
}
}
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