[PATCH] D97305: [InstSimplify] Handle nsw shl -> poison patterns

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, nikic, nlopes, lebedev.ri.
Herald added a subscriber: hiraditya.
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Pulled out from D90479 <https://reviews.llvm.org/D90479> - this recognises invalid nsw shl patterns with signbit changes that result in poison.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D97305

Files:
  llvm/lib/Analysis/InstructionSimplify.cpp
  llvm/test/Transforms/InstCombine/known-signbit-shift.ll
  llvm/test/Transforms/InstSimplify/icmp-constant.ll

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