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+
+// =================================================================================================
+// This file is part of the CLBlast project. The project is licensed under Apache Version 2.0. This
+// project loosely follows the Google C++ styleguide and uses a tab-size of two spaces and a max-
+// width of 100 characters per line.
+//
+// Author(s):
+// Cedric Nugteren <www.cedricnugteren.nl>
+//
+// This file demonstrates the use of the DGEMV routine. It is pure C99 and demonstrates the use of
+// the C API to the CLBlast library.
+//
+// Note that this example is meant for illustration purposes only. CLBlast provides other programs
+// for performance benchmarking ('client_xxxxx') and for correctness testing ('test_xxxxx').
+//
+// =================================================================================================
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+// Includes the CLBlast library (C interface)
+#include <clblast_c.h>
+
+// =================================================================================================
+
+// Example use of the double-precision routine DGEMV
+int main(void) {
+
+ // OpenCL platform/device settings
+ const size_t platform_id = 0;
+ const size_t device_id = 0;
+
+ // Example DGEMV arguments
+ const size_t m = 128;
+ const size_t n = 289;
+ const double alpha = 0.7;
+ const double beta = 0.0;
+ const size_t a_ld = n;
+
+ // Initializes the OpenCL platform
+ cl_uint num_platforms;
+ clGetPlatformIDs(0, NULL, &num_platforms);
+ cl_platform_id* platforms = (cl_platform_id*)malloc(num_platforms*sizeof(cl_platform_id));
+ clGetPlatformIDs(num_platforms, platforms, NULL);
+ cl_platform_id platform = platforms[platform_id];
+
+ // Initializes the OpenCL device
+ cl_uint num_devices;
+ clGetDeviceIDs(platform, CL_DEVICE_TYPE_ALL, 0, NULL, &num_devices);
+ cl_device_id* devices = (cl_device_id*)malloc(num_devices*sizeof(cl_device_id));
+ clGetDeviceIDs(platform, CL_DEVICE_TYPE_ALL, num_devices, devices, NULL);
+ cl_device_id device = devices[device_id];
+
+ // Creates the OpenCL context, queue, and an event
+ cl_context context = clCreateContext(NULL, 1, &device, NULL, NULL, NULL);
+ cl_command_queue queue = clCreateCommandQueue(context, device, 0, NULL);
+ cl_event event = NULL;
+
+ // Populate host data structures with some example data
+ double* host_a = (double*)malloc(sizeof(double)*m*n);
+ double* host_x = (double*)malloc(sizeof(double)*n);
+ double* host_y = (double*)malloc(sizeof(double)*m);
+ for (size_t i=0; i<m*n; ++i) { host_a[i] = 12.193; }
+ for (size_t i=0; i<n; ++i) { host_x[i] = -8.199; }
+ for (size_t i=0; i<m; ++i) { host_y[i] = 0.0; }
+
+ // Copy the data-structures to the device
+ cl_mem device_a = clCreateBuffer(context, CL_MEM_READ_WRITE, m*n*sizeof(double), NULL, NULL);
+ cl_mem device_x = clCreateBuffer(context, CL_MEM_READ_WRITE, n*sizeof(double), NULL, NULL);
+ cl_mem device_y = clCreateBuffer(context, CL_MEM_READ_WRITE, m*sizeof(double), NULL, NULL);
+ clEnqueueWriteBuffer(queue, device_a, CL_TRUE, 0, m*n*sizeof(double), host_a, 0, NULL, NULL);
+ clEnqueueWriteBuffer(queue, device_x, CL_TRUE, 0, n*sizeof(double), host_x, 0, NULL, NULL);
+ clEnqueueWriteBuffer(queue, device_y, CL_TRUE, 0, m*sizeof(double), host_y, 0, NULL, NULL);
+
+ // Call the DGEMV routine.
+ StatusCode status = CLBlastDgemv(kRowMajor, kNo,
+ m, n,
+ alpha,
+ device_a, 0, a_ld,
+ device_x, 0, 1,
+ beta,
+ device_y, 0, 1,
+ &queue, &event);
+
+ // Wait for completion
+ clWaitForEvents(1, &event);
+
+ // Example completed. See "clblast_c.h" for status codes (0 -> success).
+ printf("Completed DGEMV with status %d\n", status);
+
+ // Clean-up
+ free(platforms);
+ free(devices);
+ free(host_a);
+ free(host_x);
+ free(host_y);
+ clReleaseMemObject(device_a);
+ clReleaseMemObject(device_x);
+ clReleaseMemObject(device_y);
+ clReleaseCommandQueue(queue);
+ clReleaseContext(context);
+ return 0;
+}
+
+// =================================================================================================