[PATCH] D84327: [SCEVExpander] Add helper to clean up instrs inserted while expanding.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: serge-sans-paille, lebedev.ri, nikic, jroelofs.
Herald added subscribers: javed.absar, hiraditya.
Herald added a project: LLVM.

SCEVExpander already tracks which instructions have been inserted n
InsertedValues/InsertedPostIncValues. This patch adds an additional
vector to collect the instructions in insertion order. This can then be
used to remove exactly the instructions inserted by the expander.

This replaces ExpandedValuesCleaner, which in some cases might remove
values not inserted by the expander (e.g. if a value was dead before
insertion and is then used during expansion).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D84327

Files:
  llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
  llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp
  llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp

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