[PATCH] D140850: [Patch 2/4]: Add optimizations for icmp eq/ne (mul(X, Y), 0)

[Noah Goldstein via Phabricator via llvm-commits]

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1. Add checks if X and/or Y are odd. The Odd values are unnecessary to the icmp: isZero(Odd * N) == isZero(N)

2. If neither X nor Y is known odd, then if X * Y cannot overflow AND if X and/or Y is non-zero, the non-zero values are unnecessary to the icmp.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D140850

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
  llvm/test/Transforms/InstCombine/icmp-binop.ll
  llvm/test/Transforms/InstCombine/pr38677.ll

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