OpenCL: Expected identifier in kernel - opencl

Question

I am running the following kernel on windows 7, 64 bit, with Intel CPU and HD graphics.
I get very strange error reporting by clGetProgramBuildInfo for the following code:
#define BLOCK_SIZE 256
__kernel void reduce4(__global uint* input, __global uint* output, __local uint* sdata)
{
unsigned int tid = get_local_id(0);
unsigned int bid = get_group_id(0);
unsigned int gid = get_global_id(0);
unsigned int blockSize = get_local_size(0);
unsigned int index = bid*(BLOCK_SIZE*2) + tid;
sdata[tid] = input[index] + input[index+BLOCK_SIZE];
barrier(CLK_LOCAL_MEM_FENCE);
for(unsigned int s = BLOCK_SIZE/2; s > 64 ; s >>= 1) {
// Unrolling the last wavefront and we cut 7 iterations of this
// for-loop while we practice wavefront-programming
if(tid < s)
{
sdata[tid] += sdata[tid + s];
}
barrier(CLK_LOCAL_MEM_FENCE);
}
if (tid < 64) {
if (blockSize >= 128) sdata[tid] += sdata[tid + 64];
if (blockSize >= 64) sdata[tid] += sdata[tid + 32];
if (blockSize >= 32) sdata[tid] += sdata[tid + 16];
if (blockSize >= 16) sdata[tid] += sdata[tid + 8];
if (blockSize >= 8) sdata[tid] += sdata[tid + 4];
if (blockSize >= 4) sdata[tid] += sdata[tid + 2];
if (blockSize >= 2) sdata[tid] += sdata[tid + 1];
}
// write result for this block to global mem
if(tid == 0)
{
output[bid] = sdata[0];
}
}
It always says:
Compilation started
:38:2: error: expected identifier or '('
Compilation failed
this is for the last line, where I have put }. What is wrong here?
Update:
This is how I am reading the kernel file:
int offset = 0;
for(int i = 0; i < numOfDevices; ++i, ++offset ) {
/* Load the two source files into temporary datastores */
const char *file_names[] = {"SimpleOptimizations.cl"};
const int NUMBER_OF_FILES = 1;
char* buffer[NUMBER_OF_FILES];
size_t sizes[NUMBER_OF_FILES];
loadProgramSource(file_names, NUMBER_OF_FILES, buffer, sizes);
/* Create the OpenCL program object */
program = clCreateProgramWithSource(context, NUMBER_OF_FILES, (const char**)buffer, sizes, &error);
if(error != CL_SUCCESS) {
perror("Can't create the OpenCL program object");
exit(1);
}
Definition of loadProgramSource
void loadProgramSource(const char** files,
size_t length,
char** buffer,
size_t* sizes) {
/* Read each source file (*.cl) and store the contents into a temporary datastore */
for(size_t i=0; i < length; i++) {
FILE* file = fopen(files[i], "r");
if(file == NULL) {
perror("Couldn't read the program file");
exit(1);
}
fseek(file, 0, SEEK_END);
sizes[i] = ftell(file);
rewind(file); // reset the file pointer so that 'fread' reads from the front
buffer[i] = (char*)malloc(sizes[i]+1);
buffer[i][sizes[i]] = '\0';
fread(buffer[i], sizeof(char), sizes[i], file);
fclose(file);
}
}

Answer 1

I believe this is an issue with the way the Windows deals with text files opened with fopen(). If you take a look at the MSDN page for fopen(), it indicates that if you open a file with just "r" as the mode string, some translations will happen with regards to line-endings. This means that the size of the file you query may not match the amount of data read by fread().
To solve this, simply change the mode string to indicate that you wish to read the file as binary data (i.e. without any pesky translations):
FILE* file = fopen(files[i], "rb");