[PATCH] D94866: [ValueTracking] Strengthen impliesPoison reasoning

[Nikita Popov via Phabricator via llvm-commits]

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This implements the same basic change as D94859 <https://reviews.llvm.org/D94859>, but in a more general way. directlyImpliesPoison recurses on V, impliesPoison recurses on ValAssumedPoison. Both recursions have independent small depth limits. This allows us to handle more than just the icmp+icmp case, such as the mask+icmp case for example.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94866

Files:
  lib/Analysis/ValueTracking.cpp
  test/Transforms/InstCombine/select-and-or.ll
  unittests/Analysis/ValueTrackingTest.cpp

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