Dear Community,
I am trying to write an OpenCL kernel that counts the matching elements between to arrays. However, I do not get the expected output.
The kernel looks like this:
__kernel void matchVectors(
__global const uchar *a,
__global const uchar *b,
volatile __global uchar *c)
{
const int i = get_global_id(0);
if ( ( a[i] ^ b[i] ) == 0 )
{
atomic_inc(c, 1);
}
}
a (input) - string, 10 bytes (chars) long
b (input) - string, 10 bytes (chars) long
c - single byte (the counter that should indicate how many indexes match between a[i] and b[i])
And below are some parts of the main.c (non-OpenCL) code:
#define ELEMENT_TYPE uint8_t
#define SIZE 10
ELEMENT_TYPE c = 0;
cl_mem aMemObj = clCreateBuffer(context, CL_MEM_READ_ONLY, SIZE * sizeof(ELEMENT_TYPE), NULL, &ret);
cl_mem bMemObj = clCreateBuffer(context, CL_MEM_READ_ONLY, SIZE * sizeof(ELEMENT_TYPE), NULL, &ret);
cl_mem cMemObj = clCreateBuffer(context, CL_MEM_WRITE_ONLY, sizeof(ELEMENT_TYPE), NULL, &ret);
// Copy lists to memory buffers
ret = clEnqueueWriteBuffer(commandQueue, aMemObj, CL_TRUE, 0, SIZE * sizeof(ELEMENT_TYPE), a, 0, NULL, NULL);
ret = clEnqueueWriteBuffer(commandQueue, bMemObj, CL_TRUE, 0, SIZE * sizeof(ELEMENT_TYPE), b, 0, NULL, NULL);
// Execute kernel
ret = clEnqueueNDRangeKernel(commandQueue, kernel, clDimensions, NULL, &globalItemSize, &localItemSize, 0, NULL, NULL);
// Get the result
ret = clEnqueueReadBuffer(commandQueue, cMemObj, CL_TRUE, 0, sizeof(c), (void *)&c, 0, NULL, NULL);
// Write result
printf("Result: c = %u\n", c);
Could anyone advise what is wrong?
