[PATCH] D151341: AMDGPU: Special case uniformity info for singlethreaded workitem IDs

Wed May 24 12:30:23 PDT 2023

arsenm added a comment.

In D151341#4368708 <https://reviews.llvm.org/D151341#4368708>, @jhuber6 wrote:

> In D151341#4368704 <https://reviews.llvm.org/D151341#4368704>, @arsenm wrote:
>
>> Ballots are forcibly uniform all the time. I guess this works for every operation and don't actually need to look for specific intrinsics
>
> We should be able to remove every `convergent` attribute under this special case, right.

Maybe, in the future with convergence tokens we should have a convergence reduction optimization.

I'm thinking a cleaner way to handle this would be to just have the divergence analysis early exit for single lane functions. Divergence cannot exist in the first place

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