[PATCH] D145524: [AMDGPU] Skip buffer_wbl2 before atomic fence acquire

[Tony Tye via Phabricator via llvm-commits]

t-tye accepted this revision.
t-tye added a comment.
This revision is now accepted and ready to land.

After offline discussion, the extra waitcnt is needed because this is a fence, and an acquire needs a waitcnt to ensure a proceeding load atomic that pairs with the fence has completed before invalidating the cache. The memory model on AMDGPUUsage does show the extra waitcnt for the fence. Previously, the waitcnt was being generated as part of the release which is not required if the fence is just an acquire.


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https://reviews.llvm.org/D145524