[PATCH] D133840: AMDGPU: Add a pass to rewrite certain undef in PHI

[Ruiling, Song via Phabricator via llvm-commits]

ruiling added a comment.

Some offline discussion with @arsenm, he is fine with an IR pass to do this if this helps the optimization. @arsenm also said that maybe we can change the behavior of divergence analysis to report this as divergent, while I think we can keep this behavior now and re-visit the problem later if we meet with new issue on this. So, I will push this change to move forward.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D133840/new/

https://reviews.llvm.org/D133840