[PATCH] D128586: [SCEV] Use SCEVUnknown(poison) instead of SCEVUnknown(undef).

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: nlopes, reames, nikic.
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Use poison instead of undef for SCEVUnkown of unreachable values.
This should be in line with the movement to replace undef with poison
when possible.

Suggested in D114650 <https://reviews.llvm.org/D114650>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128586

Files:
  llvm/include/llvm/Analysis/ScalarEvolution.h
  llvm/lib/Analysis/ScalarEvolution.cpp
  llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
  llvm/test/Analysis/ScalarEvolution/shift-recurrences.ll
  llvm/test/Analysis/ScalarEvolution/unreachable-code.ll

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