[PATCH] D120544: [AMDGPU] Omit unnecessary waitcnt before barriers

[Nicolai Hähnle via Phabricator via llvm-commits]

nhaehnle added a comment.

That document is pretty useless, I have to say. There is also a very obvious gap here in the expressiveness of the `fence` instruction which Marek implicitly pointed out: it should be possible to tell the `fence` which memory types should be affected. syncscope is not enough for that. @t-tye


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