[PATCH] D57231: [LoopSimplifyCFG] Pay respect to LCSSA when removing dead blocks

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev created this revision.
mkazantsev added reviewers: rupprecht, anna, fedor.sergeev.

Utility function that we use for blocks deletion always unconditionally removes
one-input Phis. In LoopSimplifyCFG, it can lead to breach of LCSSA form.
This patch alters this function to keep them if needed.


https://reviews.llvm.org/D57231

Files:
  include/llvm/Transforms/Utils/BasicBlockUtils.h
  lib/Transforms/Scalar/LoopSimplifyCFG.cpp
  lib/Transforms/Utils/BasicBlockUtils.cpp
  test/Transforms/LoopSimplifyCFG/lcssa.ll

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