pqc/external/flint-2.4.3/fmpz_mod_poly/make_monic.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
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) 2011 Sebastian Pancratz
******************************************************************************/
#include "flint.h"
#include "fmpz.h"
#include "fmpz_mod_poly.h"
void fmpz_mod_poly_make_monic(fmpz_mod_poly_t res, const fmpz_mod_poly_t poly)
{
const slong len = poly->length;
fmpz_t inv;
if (len == 0)
{
fmpz_mod_poly_zero(res);
return;
}
fmpz_init(inv);
fmpz_invmod(inv, fmpz_mod_poly_lead(poly), &(poly->p));
fmpz_mod_poly_fit_length(res, len);
_fmpz_mod_poly_set_length(res, len);
_fmpz_mod_poly_scalar_mul_fmpz(res->coeffs,
poly->coeffs, len, inv, &(poly->p));
fmpz_clear(inv);
}