pqc/external/flint-2.4.3/fmpz/submul.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) 2009 William Hart
******************************************************************************/
#include <gmp.h>
#include "flint.h"
#include "ulong_extras.h"
#include "fmpz.h"
void
fmpz_submul(fmpz_t f, const fmpz_t g, const fmpz_t h)
{
fmpz c1 = *g;
if (!COEFF_IS_MPZ(c1)) /* g is small */
{
if (c1 < WORD(0))
fmpz_addmul_ui(f, h, -c1);
else
fmpz_submul_ui(f, h, c1);
}
else
{
fmpz c2 = *h;
if (!COEFF_IS_MPZ(c2)) /* h is small */
{
if (c2 < WORD(0))
fmpz_addmul_ui(f, g, -c2);
else
fmpz_submul_ui(f, g, c2);
}
else /* both g and h are large */
{
__mpz_struct *mpz_ptr = _fmpz_promote_val(f);
mpz_submul(mpz_ptr, COEFF_TO_PTR(c1), COEFF_TO_PTR(c2));
_fmpz_demote_val(f); /* cancellation may have occurred */
}
}
}