[PATCH] D78152: [ValueTracking] Implement impliesPoison

[Juneyoung Lee via Phabricator via llvm-commits]

aqjune created this revision.
aqjune added reviewers: spatel, nikic, lebedev.ri.
aqjune added a project: LLVM.

This PR adds impliesPoison(ValAssumedPoison, V) that returns true if V is
poison under the assumption that ValAssumedPoison is poison.

impliesPoison can be used for sound optimization of select, as discussed in
D77868 <https://reviews.llvm.org/D77868>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78152

Files:
  llvm/include/llvm/Analysis/ValueTracking.h
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/unittests/Analysis/ValueTrackingTest.cpp

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