[PATCH] D25478: Do not remove implicit defs in BranchFolder

[Krzysztof Parzyszek via llvm-commits]

kparzysz created this revision.
kparzysz added a reviewer: MatzeB.
kparzysz added a subscriber: llvm-commits.
kparzysz set the repository for this revision to rL LLVM.

BranchFolder removes implicit defs from blocks where they are the only instructions, potentially aside from an unconditional branch.  This can lead to the liveness information becoming incorrect.


Repository:
  rL LLVM

https://reviews.llvm.org/D25478

Files:
  lib/CodeGen/BranchFolding.cpp
  lib/CodeGen/BranchFolding.h
  test/CodeGen/Hexagon/branchfolder-keep-impdef.ll
  test/Transforms/LoopStrengthReduce/X86/2012-01-13-phielim.ll

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