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

56 lines
1.7 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) 2010 Sebastian Pancratz
******************************************************************************/
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
void
_fmpz_vec_scalar_submul_fmpz(fmpz * vec1, const fmpz * vec2, slong len2,
const fmpz_t x)
{
fmpz c = *x;
if (!COEFF_IS_MPZ(c))
{
if (c == 0)
return;
else if (c == 1)
_fmpz_vec_sub(vec1, vec1, vec2, len2);
else if (c == -1)
_fmpz_vec_add(vec1, vec1, vec2, len2);
else
_fmpz_vec_scalar_submul_si(vec1, vec2, len2, c);
}
else
{
slong i;
for (i = 0; i < len2; i++)
fmpz_submul(vec1 + i, vec2 + i, x);
}
}