1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2010, 2011 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Contributed by Ken Werner <ken.werner@de.ibm.com> */
/* Simple OpenCL application that executes a kernel on the default device
in a data parallel fashion. The filename of the OpenCL program source
should be specified using the CL_SOURCE define. The name of the kernel
routine is expected to be "testkernel". */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <CL/cl.h>
#include "cl_util.h"
#ifndef CL_SOURCE
#error "Please specify the OpenCL source file using the CL_SOURCE define"
#endif
#define STRINGIFY(S) _STRINGIFY(S)
#define _STRINGIFY(S) #S
#define SIZE 16
int
main ()
{
int err, i;
cl_platform_id platform;
cl_device_id device;
cl_context context;
cl_context_properties context_props[3];
cl_command_queue queue;
cl_program program;
cl_kernel kernel;
cl_mem buffer;
size_t len;
const char *program_source = NULL;
char *device_extensions = NULL;
char kernel_build_opts[256];
size_t size = sizeof (cl_int) * SIZE;
const size_t global_work_size[] = {SIZE, 0, 0}; /* size of each dimension */
cl_int *data;
/* In order to see which devices the OpenCL implementation on your platform
provides you may issue a call to the print_clinfo () fuction. */
/* Initialize the data the OpenCl program operates on. */
data = (cl_int*) calloc (1, size);
if (data == NULL)
{
fprintf (stderr, "calloc failed\n");
exit (EXIT_FAILURE);
}
/* Pick the first platform. */
CHK (clGetPlatformIDs (1, &platform, NULL));
/* Get the default device and create context. */
CHK (clGetDeviceIDs (platform, CL_DEVICE_TYPE_DEFAULT, 1, &device, NULL));
context_props[0] = CL_CONTEXT_PLATFORM;
context_props[1] = (cl_context_properties) platform;
context_props[2] = 0;
context = clCreateContext (context_props, 1, &device, NULL, NULL, &err);
CHK_ERR ("clCreateContext", err);
queue = clCreateCommandQueue (context, device, 0, &err);
CHK_ERR ("clCreateCommandQueue", err);
/* Query OpenCL extensions of that device. */
CHK (clGetDeviceInfo (device, CL_DEVICE_EXTENSIONS, 0, NULL, &len));
device_extensions = (char *) malloc (len);
CHK (clGetDeviceInfo (device, CL_DEVICE_EXTENSIONS, len, device_extensions,
NULL));
strcpy (kernel_build_opts, "-Werror -cl-opt-disable");
if (strstr (device_extensions, "cl_khr_fp64") != NULL)
strcpy (kernel_build_opts + strlen (kernel_build_opts),
" -D HAVE_cl_khr_fp64");
if (strstr (device_extensions, "cl_khr_fp16") != NULL)
strcpy (kernel_build_opts + strlen (kernel_build_opts),
" -D HAVE_cl_khr_fp16");
/* Read the OpenCL kernel source into the main memory. */
program_source = read_file (STRINGIFY (CL_SOURCE), &len);
if (program_source == NULL)
{
fprintf (stderr, "file does not exist: %s\n", STRINGIFY (CL_SOURCE));
exit (EXIT_FAILURE);
}
/* Build the OpenCL kernel. */
program = clCreateProgramWithSource (context, 1, &program_source,
&len, &err);
free ((void*) program_source);
CHK_ERR ("clCreateProgramWithSource", err);
err = clBuildProgram (program, 0, NULL, kernel_build_opts, NULL,
NULL);
if (err != CL_SUCCESS)
{
size_t len;
char *clbuild_log = NULL;
CHK (clGetProgramBuildInfo (program, device, CL_PROGRAM_BUILD_LOG, 0,
NULL, &len));
clbuild_log = malloc (len);
if (clbuild_log)
{
CHK (clGetProgramBuildInfo (program, device, CL_PROGRAM_BUILD_LOG,
len, clbuild_log, NULL));
fprintf (stderr, "clBuildProgram failed with:\n%s\n", clbuild_log);
free (clbuild_log);
}
exit (EXIT_FAILURE);
}
/* In some cases it might be handy to save the OpenCL program binaries to do
further analysis on them. In order to do so you may call the following
function: save_program_binaries (program);. */
kernel = clCreateKernel (program, "testkernel", &err);
CHK_ERR ("clCreateKernel", err);
/* Setup the input data for the kernel. */
buffer = clCreateBuffer (context, CL_MEM_USE_HOST_PTR, size, data, &err);
CHK_ERR ("clCreateBuffer", err);
/* Execute the kernel (data parallel). */
CHK (clSetKernelArg (kernel, 0, sizeof (buffer), &buffer));
CHK (clEnqueueNDRangeKernel (queue, kernel, 1, NULL, global_work_size, NULL,
0, NULL, NULL));
/* Fetch the results (blocking). */
CHK (clEnqueueReadBuffer (queue, buffer, CL_TRUE, 0, size, data, 0, NULL,
NULL));
/* Compare the results. */
for (i = 0; i < SIZE; i++)
{
if (data[i] != 0x1)
{
fprintf (stderr, "error: data[%d]: %d != 0x1\n", i, data[i]);
exit (EXIT_FAILURE);
}
}
/* Cleanup. */
CHK (clReleaseMemObject (buffer));
CHK (clReleaseKernel (kernel));
CHK (clReleaseProgram (program));
CHK (clReleaseCommandQueue (queue));
CHK (clReleaseContext (context));
free (data);
return 0;
}
|
