[PATCH] D142234: [LVI] Handle Intrinsic::ctlz

[Antonio Frighetto via Phabricator via llvm-commits]

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LazyValueInfo may now propagate information about constant and constant ranges lattice values to `ctlz` (count leading zeroes) intrinsics. The change makes sure to provide a more precise result than it was formerly produced, where possible, or a more conservative one (e.g., should the first argument value be zero and is_zero_poison true, the result would be an overdefined value), but always correct.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142234

Files:
  llvm/lib/Analysis/LazyValueInfo.cpp
  llvm/test/Analysis/LazyValueAnalysis/lvi-for-ctlz.ll

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