[PATCH] D114272: [InstCombine] Add two optimizations for mul-and-icmp patterns

[Fabian Wolff via Phabricator via llvm-commits]

fwolff created this revision.
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Fixes PR#40493 <https://bugs.llvm.org/show_bug.cgi?id=40493>, and in principle also PR#51551 <https://bugs.llvm.org/show_bug.cgi?id=51551>, but the known bits analysis isn't quite smart enough to handle the `assume` in the example there.

The entire logic for this patch has been discussed in PR#40493, it just seems that nobody has gotten around to implementing it yet.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D114272

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
  llvm/test/Transforms/InstCombine/pr40493.ll

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