[PATCH] D25370: Regenerate removed implicit defs in BranchFolder where necessary

[Krzysztof Parzyszek via llvm-commits]

kparzysz created this revision.
kparzysz added reviewers: MatzeB, qcolombet.
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kparzysz set the repository for this revision to rL LLVM.

Branch folder removes implicit defs if they are the only non-branching instructions in a block, and the branches do not use the defined registers. The problem is that in some cases these implicit defs are required for the liveness information to be correct.
After branch optimizations, regenerate those implicit defs that are still necessary.


Repository:
  rL LLVM

https://reviews.llvm.org/D25370

Files:
  lib/CodeGen/BranchFolding.cpp
  lib/CodeGen/BranchFolding.h
  test/CodeGen/Hexagon/branchfolder-keep-impdef.ll

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