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

[Ruiling, Song via Phabricator via llvm-commits]

ruiling updated this revision to Diff 460299.
ruiling added a comment.

Move the pass after SIAnnotateControlFlow.
Simplify the backedge undef logic since joining divergent threads at loop header has been handled by SIAnnotateControlFlow.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D133840/new/

https://reviews.llvm.org/D133840

Files:
  llvm/lib/Target/AMDGPU/AMDGPU.h
  llvm/lib/Target/AMDGPU/AMDGPURewriteUndefForPHI.cpp
  llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
  llvm/lib/Target/AMDGPU/CMakeLists.txt
  llvm/test/CodeGen/AMDGPU/llc-pipeline.ll
  llvm/test/CodeGen/AMDGPU/rewrite-undef-for-phi.ll
  llvm/test/CodeGen/AMDGPU/uniform-phi-with-undef.ll

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