[PATCH] D56242: Elevate instructions across if-else blocks for better constant propagation

[Ayonam Ray via Phabricator via llvm-commits]

ayonam created this revision.
ayonam added reviewers: majnemer, lebedev.ri.
Herald added subscribers: mgorny, mehdi_amini.

This patch implements elevating instructions across basic blocks that can help in better constant propagation.  If there are values that are set to different constants in different blocks of an if-else statement, then elevating the dependent instructions to those blocks individually can help in constant propagation through the dependent instructions.  In the test case that has been added, it results in elimination of a few computations via constant folding.


https://reviews.llvm.org/D56242

Files:
  include/llvm/InitializePasses.h
  include/llvm/LinkAllPasses.h
  include/llvm/Transforms/Scalar.h
  include/llvm/Transforms/Scalar/Elevate.h
  lib/Transforms/IPO/PassManagerBuilder.cpp
  lib/Transforms/Scalar/CMakeLists.txt
  lib/Transforms/Scalar/Elevate.cpp
  lib/Transforms/Scalar/Scalar.cpp
  test/Transforms/Elevate/elevate-if-else.ll

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