pqc/external/flint-2.4.3/nmod_poly/evaluate_fmpz.c
2014-05-24 23:16:06 +02:00

73 lines
1.9 KiB
C

/*=============================================================================
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) 2010 William Hart
Copyright (C) 2013 Mike Hansen
******************************************************************************/
#include <gmp.h>
#include "flint.h"
#include "ulong_extras.h"
#include "nmod_poly.h"
/* TODO: Add a divconquer method */
void
_nmod_poly_evaluate_fmpz(fmpz_t rop, const mp_srcptr poly, const slong len, const fmpz_t c)
{
fmpz_t t;
slong m;
if (len == 0)
{
fmpz_zero(rop);
return;
}
if (len == 1 || c == 0)
{
fmpz_set_ui(rop, poly[0]);
return;
}
m = len - 1;
fmpz_init(t);
fmpz_set_ui(rop, poly[m]);
m--;
for ( ; m >= 0; m--)
{
fmpz_mul(t, rop, c);
fmpz_add_ui(rop, t, poly[m]);
}
fmpz_clear(t);
}
void
nmod_poly_evaluate_fmpz(fmpz_t rop, const nmod_poly_t poly, const fmpz_t c)
{
_nmod_poly_evaluate_fmpz(rop, poly->coeffs, poly->length, c);
}