[PATCH] D19950: Use frequency info to guide Loop Invariant Code Motion.

[Dehao Chen via llvm-commits]

danielcdh created this revision.
danielcdh added reviewers: hfinkel, davidxl, majnemer.
danielcdh added a subscriber: llvm-commits.
Herald added a subscriber: aemerson.

If an instruction's frequency is smaller than preheader, it will harm performance to hoist the instruction to the preheader.

http://reviews.llvm.org/D19950

Files:
  include/llvm/Transforms/Utils/LoopUtils.h
  lib/Transforms/Scalar/LICM.cpp
  test/Other/pass-pipelines.ll

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