clBLAS  2.11
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example_zhpr2.c

Example of how to use the clblasZhpr2 function.

/* ************************************************************************
* Copyright 2013 Advanced Micro Devices, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ************************************************************************/
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
/* Include CLBLAS header. It automatically includes needed OpenCL header,
* so we can drop out explicit inclusion of cl.h header.
*/
#include <clBLAS.h>
/* This example uses predefined matrices and their characteristics for
* simplicity purpose.
*/
static const clblasOrder order = clblasRowMajor;
static const size_t N = 5;
static cl_double2 alpha = {{10.0f, 2.0f}};
static const clblasUplo uplo = clblasUpper;
static cl_double2 AP[] = {
{{11.0f, 00.0f}}, {{12.0f, 02.0f}}, {{13.0f, 05.0f}}, {{14.0f, 12.0f}}, {{15.0f, 06.0f}},
{{22.0f, 00.0f}}, {{23.0f, 25.0f}}, {{24.0f, 23.0f}}, {{25.0f, 61.0f}},
{{33.0f, 00.0f}}, {{34.0f, 23.0f}}, {{35.0f, 21.0f}},
{{44.0f, 00.0f}}, {{45.0f, 23.0f}},
{{55.0f, 00.0f}}
};
static const cl_double2 X[] = {
{{11.0f, 03.0f}},
{{01.0f, 15.0f}},
{{30.0f, 20.0f}},
{{01.0f, 02.0f}},
{{11.0f, 10.0f}}
};
static const int incx = 1;
static const cl_double2 Y[] = {
{{11.0f, 03.0f}},
{{03.0f, 05.0f}},
{{09.0f, 00.0f}},
{{01.0f, 02.0f}},
{{11.0f, 00.0f}}
};
static const int incy = 1;
static void
printResult(void)
{
size_t i, j, off;
printf("\nResult:\n");
off = 0;
for (i = 0; i < N; i++) {
for(j = 0; j < N; j++) {
if( ( (uplo == clblasUpper) && (i > j)) || ((uplo == clblasLower) && (j > i)) )
{
printf("\t\t\t");
continue;
}
printf("(%9.2lf, %-9.2lf)\t", CREAL( AP[ off ] ), CIMAG( AP[ off ] ));
off ++ ;
}
printf("\n");
}
}
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 bufAP, bufX, bufY;
cl_event event = NULL;
int ret = 0, numElementsAP;
/* 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;
}
numElementsAP = (N * (N+1)) / 2; // To get number of elements in a packed matrix
/* Prepare OpenCL memory objects and place matrices inside them. */
bufAP = clCreateBuffer(ctx, CL_MEM_READ_WRITE, (numElementsAP * sizeof(cl_double2)),
NULL, &err);
bufX = clCreateBuffer(ctx, CL_MEM_READ_ONLY, N * sizeof(cl_double2),
NULL, &err);
bufY = clCreateBuffer(ctx, CL_MEM_READ_ONLY, N * sizeof(cl_double2),
NULL, &err);
err = clEnqueueWriteBuffer(queue, bufAP, CL_TRUE, 0,
numElementsAP * sizeof(cl_double2), AP, 0, NULL, NULL);
err = clEnqueueWriteBuffer(queue, bufX, CL_TRUE, 0,
N * sizeof(cl_double2), X, 0, NULL, NULL);
err = clEnqueueWriteBuffer(queue, bufY, CL_TRUE, 0,
N * sizeof(cl_double2), Y, 0, NULL, NULL);
err = clblasZhpr2(order, uplo, N, alpha, bufX, 0 /*offx */, incx, bufY, 0 /*offy*/, incy,
bufAP, 0 /*offa */, 1, &queue, 0, NULL, &event);
if (err != CL_SUCCESS) {
printf("clblasZhpr2() 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, bufAP, CL_TRUE, 0, (numElementsAP * sizeof(cl_double2)),
AP, 0, NULL, NULL);
/* At this point you will get the result of ZHPR2 placed in A array. */
printResult();
}
/* Release OpenCL events. */
clReleaseEvent(event);
/* Release OpenCL memory objects. */
clReleaseMemObject(bufX);
clReleaseMemObject(bufAP);
clReleaseMemObject(bufY);
/* Finalize work with clblas. */
/* Release OpenCL working objects. */
clReleaseCommandQueue(queue);
clReleaseContext(ctx);
return ret;
}