AnsweredAssumed Answered

Seeking sum algorithm for GPU

Question asked by boxerab on Sep 11, 2015
Latest reply on Sep 12, 2015 by realhet

I have a workgroup of size N, and local array "buffer" of size N.


For each work item in the group, with local id k, I want to calculate

the sum S of all array items with index less than k.



for (int i  = 0; i < k; ++i)

    S += buffer[i];

Currently, I calculate this naively, as above.  Is there a more efficient way of

doing this, where intermediate sums are stored back into buffer, for example?