[PATCH] D117000: [LICM] Generalize unwinding check during scalar promotion

[Nikita Popov via Phabricator via llvm-commits]

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This generalizes the unwinding check during scalar promotion with the new semantics from D116998 <https://reviews.llvm.org/D116998>. I've extracted a common isNotVisibleOnUnwind() helper into AliasAnalysis, which handles allocas, byval arguments, sret arguments and noalias calls, as we have a few more places that need basically the same logic (DSE and MemCpyOpt at least). The noalias call case is a bit different from the others, because it also requires that the object is not captured.


https://reviews.llvm.org/D117000

Files:
  llvm/include/llvm/Analysis/AliasAnalysis.h
  llvm/lib/Analysis/AliasAnalysis.cpp
  llvm/lib/Transforms/Scalar/LICM.cpp
  llvm/test/Transforms/LICM/scalar-promote-unwind.ll

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