[PATCH] D64946: [AMDGPU] Fix trivial PHI into SI_END_CF.

[Michael Liao via Phabricator via llvm-commits]

hliao created this revision.
hliao added reviewers: arsenm, rampitec.
Herald added subscribers: llvm-commits, hiraditya, t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, jvesely, kzhuravl.
Herald added a project: LLVM.

- SI_END_CF, a MBB prologue instruction, should not take any source from PHI. But, LCSSA pass may insert one.
- Teach PHIElim to handle such case by providing target-specific hook to get the insert point for PHI lowering (replace PHI with COPY). So that, the target could canonicalize any MBB prologue instructions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D64946

Files:
  llvm/include/llvm/CodeGen/TargetInstrInfo.h
  llvm/lib/CodeGen/PHIElimination.cpp
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/lib/Target/AMDGPU/SIInstrInfo.h
  llvm/test/CodeGen/AMDGPU/lcssa-optnone.ll

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