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/*
Copyright (C) 2008, 2009 William Hart
Copyright (C) 2010 Sebastian Pancratz
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "ulong_extras.h"
#include "fmpz.h"
#include "fmpz_poly.h"
ulong _fmpz_poly_evaluate_mod(const fmpz * poly, slong len, ulong a,
ulong n, ulong ninv)
{
ulong 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;
}
ulong fmpz_poly_evaluate_mod(const fmpz_poly_t poly, ulong a,
ulong n)
{
if (poly->length == 0)
return 0;
if (a == 0)
{
ulong res;
res = fmpz_fdiv_ui(poly->coeffs, n);
return res;
}
else
{
ulong ninv;
ninv = n_preinvert_limb(n);
return _fmpz_poly_evaluate_mod(poly->coeffs, poly->length, a, n, ninv);
}
}