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

58 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) 2011 Fredrik Johansson
******************************************************************************/
#include <stdlib.h>
#include "flint.h"
#include "fmpz_poly.h"
#include "fmpz_poly_mat.h"
slong
fmpz_poly_mat_max_bits(const fmpz_poly_mat_t A)
{
slong i, j, bits, max;
int sign;
max = 0;
sign = 0;
for (i = 0; i < A->r; i++)
{
for (j = 0; j < A->c; j++)
{
bits = fmpz_poly_max_bits(fmpz_poly_mat_entry(A, i, j));
if (bits < 0)
{
sign = 1;
max = FLINT_MAX(max, -bits);
}
else
max = FLINT_MAX(max, bits);
}
}
return sign ? -max : max;
}