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GCN: local memory barrier and work group size Part II

Question asked by boxerab on Dec 14, 2016
Latest reply on Dec 19, 2016 by boxerab

A year and a half ago I asked a question here on the forum about the need for local memory barriers for

work groups with local size <= 64 (size of wave front).


The answer at that time was that the compiler would remove these barriers anyways, so they didn't need

to be added to the code, even though the spec requires them.


I can verify now that for Polaris arch, they are needed. This change has been causing a hard crash on my application

when targeting Polaris.


Lesson is to follow the spec Or, re-validate assumptions with every new architecture.