OpenCL_helpers/examples/simple_kernel/simple_kernel.clc

__kernel void krSimpleKernel(__global  float* pA,
                             __global  float* pB,
                             __private long unsigned int size) {
    long unsigned int idx=get_global_id(0);
    if(idx<size) pB[idx]=pA[idx]*pA[idx];
    return;
}