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Getting rid of scratch registers

Question asked by boxerab on Aug 29, 2015
Latest reply on Aug 31, 2015 by boxerab

I have a kernel which is using 720 scratch registers. Perf is low, even though occupancy is 60%.

The kernel is very serial: no LDS usage or interaction between work items, just each work item processing

a serial algorithm.  Each kernel uses a private array of size 3K, so I think this is what is causing such

high scratch usage.

 

Besides reducing the size of this array, what else can I do to eliminate scratch registers?

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