[PATCH] D154584: Improve collectEphemeralValues and use it in CodeGenPrepare

[Serguei Katkov via Phabricator via llvm-commits]

skatkov created this revision.
skatkov added reviewers: jdoerfert, nikic, arsenm, fhahn.
Herald added subscribers: StephenFan, hiraditya.
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skatkov requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

Improve collectEphemeralValues to find ephemeral induction variable
and be based on wouldInstructionBeTriviallyDead utility function.

Also use this function in CodeGenPrepare to collect and erase the same
set of ephemeral values.


https://reviews.llvm.org/D154584

Files:
  llvm/include/llvm/Analysis/CodeMetrics.h
  llvm/lib/Analysis/CodeMetrics.cpp
  llvm/lib/CodeGen/CodeGenPrepare.cpp
  llvm/test/Transforms/CodeGenPrepare/X86/delete-assume-dead-code.ll

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