pqc/external/flint-2.4.3/fmpz_mat/mul_classical.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) 2010,2011 Fredrik Johansson
******************************************************************************/
#include "fmpz_mat.h"
void
fmpz_mat_mul_classical(fmpz_mat_t C, const fmpz_mat_t A, const fmpz_mat_t B)
{
slong ar, bc, br;
slong i, j, k;
ar = A->r;
br = B->r;
bc = B->c;
if (br == 0)
{
fmpz_mat_zero(C);
return;
}
for (i = 0; i < ar; i++)
{
for (j = 0; j < bc; j++)
{
fmpz_mul(fmpz_mat_entry(C, i, j),
fmpz_mat_entry(A, i, 0),
fmpz_mat_entry(B, 0, j));
for (k = 1; k < br; k++)
{
fmpz_addmul(fmpz_mat_entry(C, i, j),
fmpz_mat_entry(A, i, k),
fmpz_mat_entry(B, k, j));
}
}
}
}