//Example 1. Application Using C and CUBLAS: 1-based indexing
#include <stdlib.h>
#include <math.h>
#include <cuda_runtime.h>
#include "cublas_v2.h"
#include <stdio.h>
#define M 6
#define N 5
#define IDX2F(i,j,ld) ((((j)-1)*(ld))+((i)-1))
static __inline__ void modify (cublasHandle_t handle, float*m, int ldm, int
n, int p, int q, float alpha, float beta){
cublasSscal (handle, n-p+1, &alpha, &m[IDX2F(p,q,ldm)], ldm);
cublasSscal (handle, ldm-p+1, &beta, &m[IDX2F(p,q,ldm)], 1);
}
int main (void){
cudaError_t cudaStat;
cublasStatus_t stat;
cublasHandle_t handle;
int i, j;
float* devPtrA;
float* a = 0;
a = (float*)malloc (M * N * sizeof(*a));
if(!a) {
printf("host memory allocation failed");
return EXIT_FAILURE;
}
for(j = 1; j <= N; j++) {
for(i = 1; i <= M; i++) {
a[IDX2F(i,j,M)] = (float)((i-1) * M + j);
printf("%7.0f",a[IDX2F(i,j,M)]);
}printf("\n");
}printf("\n");
cudaStat = cudaMalloc ((void**)&devPtrA, M*N*sizeof(*a));
if(cudaStat != cudaSuccess) {
printf ("device memory allocation failed");
return EXIT_FAILURE;
}
stat = cublasCreate(&handle);
if(stat != CUBLAS_STATUS_SUCCESS) {
printf ("CUBLAS initialization failed\n");
return EXIT_FAILURE;
}
stat = cublasSetMatrix (M, N, sizeof(*a), a, M, devPtrA, M);
if(stat != CUBLAS_STATUS_SUCCESS) {
printf ("data download failed");
cudaFree (devPtrA);
cublasDestroy(handle);
return EXIT_FAILURE;
}
modify (handle, devPtrA, M, N, 2, 3, 16.0f, 12.0f);
stat = cublasGetMatrix (M, N, sizeof(*a), devPtrA, M, a, M);
if(stat != CUBLAS_STATUS_SUCCESS) {
printf("data upload failed");
cudaFree (devPtrA);
cublasDestroy(handle);
return EXIT_FAILURE;
}
cudaFree (devPtrA);
cublasDestroy(handle);
for(j = 1; j <= N; j++) {
for(i = 1; i <= M; i++) {
printf ("%7.0f", a[IDX2F(i,j,M)]);
}
printf ("\n");
}
free(a);
return EXIT_SUCCESS;
}
