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

56 lines
1.8 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) 2007, David Howden.
Copyright (C) 2010 William Hart
******************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <gmp.h>
#include "flint.h"
#include "nmod_poly.h"
void _nmod_poly_make_monic(mp_ptr output,
mp_srcptr input, slong len, nmod_t mod)
{
mp_limb_t inv;
inv = n_invmod(input[len - 1], mod.n);
_nmod_vec_scalar_mul_nmod(output, input, len, inv, mod);
}
void nmod_poly_make_monic(nmod_poly_t output, const nmod_poly_t input)
{
if (input->length == 0)
{
flint_printf("Exception (nmod_poly_make_monic). Division by zero.\n");
abort();
}
nmod_poly_fit_length(output, input->length);
_nmod_poly_make_monic(output->coeffs,
input->coeffs, input->length, input->mod);
output->length = input->length;
}