Hi,
I have an ATI Firepro V4800 graphics card which does not support cl_khr_int64_base_atomics. I am trying to adapt the RadixSort algo given in the SDK Examples for long integers. The algo uses atomic_inc, the 64-bit of which is atom_inc, which I cannot use in the kernel. So, my question is, is there a piece of code which performs the same function as atomic_inc which can be used? The piece of kernel code is given below:
__kernel void histogram(__global uint* unsortedData,
__global uint* buckets,
uint shiftCount,
__local uint* sharedArray)
{
size_t localId = get_local_id(0);
size_t globalId = get_global_id(0);
size_t groupId = get_group_id(0);
size_t groupSize = get_local_size(0);
uint numGroups = get_global_size(0) / get_local_size(0);
// Initialize shared array to zero //
sharedArray[localId] = 0;
barrier(CLK_LOCAL_MEM_FENCE);
// Calculate thread-histograms //
uint value = unsortedData[globalId];
value = value >> shiftCount & 0xFFU;
atomic_inc(sharedArray+value);
barrier(CLK_LOCAL_MEM_FENCE);
// Copy calculated histogram bin to global memory //
uint bucketPos = groupId * groupSize + localId ;
//uint bucketPos = localId * numGroups + groupId ;
buckets[bucketPos] = sharedArray[localId];
}