[PATCH] D26495: [simplifycfg][loop-simplify] Preserve loop metadata in 2 transformations.

[Florian Hahn via llvm-commits]

fhahn created this revision.
fhahn added reviewers: rnk, chandlerc.
fhahn added a subscriber: llvm-commits.

insertUniqueBackedgeBlock in lib/Transforms/Utils/LoopSimplify.cpp now
propagates existing llvm.loop metadata to newly the added backedge.

llvm::TryToSimplifyUncondBranchFromEmptyBlock in lib/Transforms/Utils/Local.cpp
now propagates existing llvm.loop metadata to the branch instructions in the
predecessor blocks of the empty block that is removed.


https://reviews.llvm.org/D26495

Files:
  lib/Transforms/Utils/Local.cpp
  lib/Transforms/Utils/LoopSimplify.cpp
  test/Transforms/LoopSimplify/preserve-llvm-loop-metadata.ll
  test/Transforms/SimplifyCFG/preserve-llvm-loop-metadata.ll

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