pqc/external/flint-2.4.3/fmpz/cmpabs.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"
int fmpz_cmpabs(const fmpz_t f, const fmpz_t g)
{
if (f == g) return 0; /* aliased inputs */
if (!COEFF_IS_MPZ(*f))
{
if (!COEFF_IS_MPZ(*g))
{
mp_limb_t uf = FLINT_ABS(*f);
mp_limb_t ug = FLINT_ABS(*g);
return (uf < ug ? -1 : (uf > ug));
}
else return -1;
}
else
{
if (!COEFF_IS_MPZ(*g)) return 1; /* f is large, so if g isn't... */
else return mpz_cmpabs(COEFF_TO_PTR(*f), COEFF_TO_PTR(*g));
}
}