[PATCH] D110456: [CodeMoverUtils] Enhance isSafeToMoveBefore() when control flow equivalence is satisfied

[Congzhe Cao via Phabricator via llvm-commits]

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With improved analysis in determining CFG equivalence that does not require strict dominance and post-dominance conditions, we now relax  isSafeToMoveBefore() such that an instruction I can be moved before InsertPoint even if they do not strictly dominate each other, as long as they follow the same control flow path.

For example,  we can move Instruction 0 before Instruction 1, and vice versa.

  if (cond1)
     // Instruction 0: %add = add i32 1, 2
  if (cond1)
     // Instruction 1: %add2 = add i32 2, 1


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110456

Files:
  llvm/include/llvm/Transforms/Utils/CodeMoverUtils.h
  llvm/lib/Transforms/Utils/CodeMoverUtils.cpp
  llvm/unittests/Transforms/Utils/CodeMoverUtilsTest.cpp

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