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/*
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 "fmpz.h"
#include "fmpz_poly.h"
void
_fmpz_poly_evaluate_horner_fmpz(fmpz_t res, const fmpz * f, slong len,
const fmpz_t a)
{
if (len == 0)
{
fmpz_zero(res);
}
else if (len == 1 || fmpz_is_zero(a))
{
fmpz_set(res, f);
}
else
{
slong i = len - 1;
fmpz_t t;
fmpz_init(t);
fmpz_set(res, f + i);
for (i = len - 2; i >= 0; i--)
{
fmpz_mul(t, res, a);
fmpz_add(res, f + i, t);
}
fmpz_clear(t);
}
}
void
fmpz_poly_evaluate_horner_fmpz(fmpz_t res, const fmpz_poly_t f, const fmpz_t a)
{
if (res == a)
{
fmpz_t t;
fmpz_init(t);
_fmpz_poly_evaluate_horner_fmpz(t, f->coeffs, f->length, a);
fmpz_swap(res, t);
fmpz_clear(t);
}
else
_fmpz_poly_evaluate_horner_fmpz(res, f->coeffs, f->length, a);
}