[PATCH] D144759: [AMDGPU] Implement idempotent atomic lowering

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec planned changes to this revision.
rampitec added a comment.

Just discussed it with Tony. This seems somewhat problematic as exploiting a general lack of other atomic optimizations and that we cannot really reorder a fence. But then we only really need it for relaxed atomic and can safely do without a fence for a relaxed or acquire atomic. So let's keep it simple and only do the optimization if there is no release semantics on the atomicrmw. I will update the patch.


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  https://reviews.llvm.org/D144759/new/

https://reviews.llvm.org/D144759