All Classes Namespaces Functions Variables Typedefs Enumerations Enumerator Friends
test_blas.cpp
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD+Patents license found in the
* LICENSE file in the root directory of this source tree.
*/
#include <cstdio>
#include <cstdlib>
#undef FINTEGER
#define FINTEGER long
extern "C" {
/* declare BLAS functions, see http://www.netlib.org/clapack/cblas/ */
int sgemm_ (const char *transa, const char *transb, FINTEGER *m, FINTEGER *
n, FINTEGER *k, const float *alpha, const float *a,
FINTEGER *lda, const float *b, FINTEGER *
ldb, float *beta, float *c, FINTEGER *ldc);
/* Lapack functions, see http://www.netlib.org/clapack/old/single/sgeqrf.c */
int sgeqrf_ (FINTEGER *m, FINTEGER *n, float *a, FINTEGER *lda,
float *tau, float *work, FINTEGER *lwork, FINTEGER *info);
}
float *new_random_vec(int size)
{
float *x = new float[size];
for (int i = 0; i < size; i++)
x[i] = drand48();
return x;
}
int main() {
FINTEGER m = 10, n = 20, k = 30;
float *a = new_random_vec(m * k), *b = new_random_vec(n * k), *c = new float[n * m];
float one = 1.0, zero = 0.0;
printf("BLAS test\n");
sgemm_("Not transposed", "Not transposed",
&m, &n, &k, &one, a, &m, b, &k, &zero, c, &m);
printf("errors=\n");
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
float accu = 0;
for (int l = 0; l < k; l++)
accu += a[i + l * m] * b[l + j * k];
printf ("%6.3f ", accu - c[i + j * m]);
}
printf("\n");
}
long info = 0x64bL << 32;
long mi = 0x64bL << 32 | m;
float *tau = new float[m];
FINTEGER lwork = -1;
float work1;
printf("Intentional Lapack error (appears only for 64-bit INTEGER):\n");
sgeqrf_ (&mi, &n, c, &m, tau, &work1, &lwork, (FINTEGER*)&info);
// sgeqrf_ (&m, &n, c, &zeroi, tau, &work1, &lwork, (FINTEGER*)&info);
printf("info=%016lx\n", info);
if(info >> 32 == 0x64b) {
printf("Lapack uses 32-bit integers\n");
} else {
printf("Lapack uses 64-bit integers\n");
}
return 0;
}