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Justine Tunney 2020-06-15 07:18:57 -07:00
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dsp/core/matmul3.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ 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; version 2 of the License. │
│ │
│ 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., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "dsp/core/core.h"
#include "libc/str/str.h"
/**
* Multiplies 3×3 matrices.
*/
void *matmul3(double R[restrict 3][3], const double A[3][3],
const double B[3][3]) {
int i, j, k;
memset(R, 0, sizeof(double) * 3 * 3);
for (i = 0; i < 3; ++i) {
for (j = 0; j < 3; ++j) {
for (k = 0; k < 3; ++k) {
R[i][j] += A[k][j] * B[i][k];
}
}
}
return R;
}