[PATCH] D11196: Create a wrapper pass for BlockFrequencyInfo so that block frequency analysis can be done without requiring a pass.

[Cong Hou]

congh created this revision.
congh added a reviewer: dexonsmith.
congh added subscribers: llvm-commits, davidxl.

There are already several wrapper passes in LLVM such as LoopInfoWrapperPass and DominatorTreeWrapperPass. The benefit of a wrapper pass is to decouple the analysis from the function pass. This patch creates a wrapper pass for BlockFrequencyInfo. This is useful when we want to do block frequency analysis conditionally (e.g. only in PGO mode) but don't want to add one more pass dependence.

http://reviews.llvm.org/D11196

Files:
  include/llvm/Analysis/BlockFrequencyInfo.h
  include/llvm/InitializePasses.h
  lib/Analysis/Analysis.cpp
  lib/Analysis/BlockFrequencyInfo.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp

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