OpenCL kernel and odd copy

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I’m studying OpenCL and I’m trying to do this exercise but I don’t know how to write the corresponding kernel code in order to avoid the branch-divergence problem.

BpmGc
BpmGc1092×253 25.6 KB

I write something like that but I don’t know if I’ll problem or branch divergence

__kernel void oddcopy(const __global const int *a, __global int*b) {
    int gid = get_global_id(0);
    if(gid%2==0){
    b[gid] = a[gid];
    }
}

I hope my question is clear because I’m not very well at English, sorry.

Thanks in advance for the help, if there are problems let me know!