[PATCH] D115747: [AMDGPU] Hoist waitcnt out of loops when they unecessarily wait for stores

[Baptiste Saleil via Phabricator via llvm-commits]

bsaleil added a comment.

That makes sense, thanks for the comments. So maybe I can start by trying to implement the idea of rotating the processing loop and making a decision from the predecessors and see if that solution would be enough to fix the most common cases we observed. Then, if control flow inside loops is really an issue with that solution, I can try the other solution based on GPR liveness, but I also don't like the idea of having another fixed-point loop that could significantly degrade compilation time.


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