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

50 lines
1.6 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 Sebastian Pancratz
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "ulong_extras.h"
#include "fmpz.h"
void fmpz_sqrt(fmpz_t f, const fmpz_t g)
{
if (fmpz_sgn(g) < 0)
{
flint_printf("Exception (fmpz_sqrt). g is negative.\n");
abort();
}
if (!COEFF_IS_MPZ(*g))
fmpz_set_ui(f, n_sqrt(*g));
else
{
__mpz_struct * mpz_ptr = _fmpz_promote(f);
mpz_sqrt(mpz_ptr, COEFF_TO_PTR(*g));
_fmpz_demote_val(f);
}
}