text: /* ************************************************************************
   * 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_float alpha = 10.0;
  static const clblasUplo uplo = clblasUpper;
  
  static cl_float AP[] = {
      1.0, 02.0, 03.0, 04.0, 05.0,
           06.0, 07.0, 08.0, 09.0,
                 10.0, 11.0, 12.0,
                       13.0, 14.0,
                             15.0
  };
  
  static const cl_float X[] = {
      1.0,
      2.0,
      3.0,
      4.0,
      5.0
  };
  static const int incx = 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");
                  continue;
              }
  
  			printf("%8.2lf\t", 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;
      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_float),
                              NULL, &err);
      bufX = clCreateBuffer(ctx, CL_MEM_READ_ONLY, N * sizeof(cl_float),
                              NULL, &err);
  
      err = clEnqueueWriteBuffer(queue, bufAP, CL_TRUE, 0,
                              numElementsAP * sizeof(cl_float), AP, 0, NULL, NULL);
      err = clEnqueueWriteBuffer(queue, bufX, CL_TRUE, 0,
                              N * sizeof(cl_float), X, 0, NULL, NULL);
  
  
      err = clblasSspr(order, uplo, N, alpha, bufX, 0 /*offx */, incx,
  						    bufAP, 0 /*offa */, 1, &queue, 0, NULL, &event);
  
     	if (err != CL_SUCCESS) {
          printf("clblasSspr() 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_float)),
                                    AP, 0, NULL, NULL);
          /* At this point you will get the result of SSPR placed in A array. */
          printResult();
      }
  
  
      /* Release OpenCL memory objects. */
      clReleaseMemObject(bufX);
      clReleaseMemObject(bufAP);
  
      /* Finalize work with clblas. */
      clblasTeardown();
  
      /* Release OpenCL working objects. */
      clReleaseCommandQueue(queue);
      clReleaseContext(ctx);
  
      return ret;
  }
  