[PATCH] D22778: Add Loop Sink pass to reverse the LICM based of basic block frequency.

[Dehao Chen via llvm-commits]

danielcdh created this revision.
danielcdh added reviewers: hfinkel, davidxl.
danielcdh added a subscriber: llvm-commits.
Herald added subscribers: mzolotukhin, sanjoy.

LICM may hoist instructions to preheader speculatively. Before code generation, we need to sink down the hoisted instructions inside to loop if it's beneficial. This pass is a reverse of LICM: looking at instructions in preheader and sinks the instruction to basic blocks inside the loop body if basic block frequency is smaller than the preheader frequency.

https://reviews.llvm.org/D22778

Files:
  include/llvm/InitializePasses.h
  include/llvm/LinkAllPasses.h
  include/llvm/Transforms/Scalar.h
  lib/Transforms/Scalar/CMakeLists.txt
  lib/Transforms/Scalar/LoopSink.cpp
  lib/Transforms/Scalar/Scalar.cpp
  lib/Transforms/Utils/SimplifyInstructions.cpp
  test/Transforms/LICM/sink.ll

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