/** Scales a vector by a real constant; \f$ x = \alpha x \f$.
@param[in]
n Number of elements in vector x. n >= 0.
@param[in]
alpha Scalar \f$ \alpha \f$ (real)
@param[in,out]
dx COMPLEX array on GPU device.
The n element vector x of dimension (1 + (n-1)*incx).
@param[in]
incx Stride between consecutive elements of dx. incx > 0.
@ingroup magma_cblas1
*/
extern "C" void
magma_csscal(
magma_int_t n,
float alpha,
magmaFloatComplex_ptr dx, size_t dx_offset, magma_int_t incx,
magma_queue_t queue )
{
if (n <= 0)
return;
cl_int err = clblasCsscal(
n, alpha, dx, dx_offset, incx,
1, &queue, 0, NULL, g_event );
clFlush(queue);
check_error( err );
}
int
main(void)
{
cl_int err;
cl_platform_id platform = 0;
cl_device_id device = 0;
cl_context_properties props[3] = { CL_CONTEXT_PLATFORM, 0, 0 };
cl_context ctx = 0;
cl_command_queue queue = 0;
cl_mem bufX;
cl_event event = NULL;
int ret = 0;
int lenX = 1 + (N-1)*abs(incx);
/* Setup OpenCL environment. */
err = clGetPlatformIDs(1, &platform, NULL);
if (err != CL_SUCCESS) {
printf( "clGetPlatformIDs() failed with %d\n", err );
return 1;
}
err = clGetDeviceIDs(platform, CL_DEVICE_TYPE_GPU, 1, &device, NULL);
if (err != CL_SUCCESS) {
printf( "clGetDeviceIDs() failed with %d\n", err );
return 1;
}
props[1] = (cl_context_properties)platform;
ctx = clCreateContext(props, 1, &device, NULL, NULL, &err);
if (err != CL_SUCCESS) {
printf( "clCreateContext() failed with %d\n", err );
return 1;
}
queue = clCreateCommandQueue(ctx, device, 0, &err);
if (err != CL_SUCCESS) {
printf( "clCreateCommandQueue() failed with %d\n", err );
clReleaseContext(ctx);
return 1;
}
/* Setup clblas. */
err = clblasSetup();
if (err != CL_SUCCESS) {
printf("clblasSetup() failed with %d\n", err);
clReleaseCommandQueue(queue);
clReleaseContext(ctx);
return 1;
}
/* Prepare OpenCL memory objects and place vectors inside them. */
bufX = clCreateBuffer(ctx, CL_MEM_READ_WRITE, ( lenX * sizeof(cl_float2)),
NULL, &err);
err = clEnqueueWriteBuffer(queue, bufX, CL_TRUE, 0,
(lenX * sizeof(cl_float2)), X, 0, NULL, NULL);
/* Call clblas function. */
err = clblasCsscal( N, alpha, bufX, 0, incx, 1, &queue, 0, NULL, &event);
if (err != CL_SUCCESS) {
printf("clblasCsscal() failed with %d\n", err);
ret = 1;
}
else {
/* Wait for calculations to be finished. */
err = clWaitForEvents(1, &event);
/* Fetch results of calculations from GPU memory. */
err = clEnqueueReadBuffer(queue, bufX, CL_TRUE, 0, (lenX * sizeof(cl_float2)),
X, 0, NULL, NULL);
/* At this point you will get the result of CSSCAL placed in vector X. */
printResult();
}
/* Release OpenCL memory objects. */
clReleaseMemObject(bufX);
/* Finalize work with clblas. */
clblasTeardown();
/* Release OpenCL working objects. */
clReleaseCommandQueue(queue);
clReleaseContext(ctx);
return ret;
}
