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/*
* Matrix operations library
*
* Copyright (C) 1999-2000
* Thomas Sailer, <sailer@ife.ee.ethz.ch>
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/* AIX requires this to be the first thing in the file. */
#ifndef __GNUC__
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif
# endif
# endif
#endif
#include <string.h>
#include "mat.h"
/* c el R^{d1 x d3}, a el R^{d1 x d2}, b el R^{d2 x d3} */
void frmul(float *c, const float *a, const float *b, unsigned int d1, unsigned int d2, unsigned int d3)
{
float *r = c, s;
unsigned int i, j, k;
if (c == a || c == b)
r = alloca(d1 * d3 * sizeof(r[0]));
for (i = 0; i < d1; i++)
for (k = 0; k < d3; k++) {
for (s = 0, j = 0; j < d2; j++)
s += a[i*d2+j] * b[j*d3+k];
r[i*d3+k] = s;
}
if (r != c)
memcpy(c, r, d1 * d3 * sizeof(c[0]));
}
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