[PATCH] D140851: [Patch 3/4]: Add cases for assume (X & Y != {0|Y})

[Noah Goldstein via Phabricator via llvm-commits]

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If X or Y is known to be a non-zero power of 2 we can prove the known
bit.

I.e assume X is a variable and Y is a power of 2 constants.

1. assume(X & Y == 0) -> Known(X).Zeros[Log2(Y)] = 1

2. assume(X & Y == Y) -> Known(X).Ones[Log2(Y)] = 1


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D140851

Files:
  llvm/lib/Analysis/AssumptionCache.cpp
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/test/Transforms/InstCombine/icmp-binop.ll

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