[PATCH] D67498: [InstSimplify] simplifyUnsignedRangeCheck(): handle few tautological cases (PR43251)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: spatel, nikic, xbolva00.
lebedev.ri added a project: LLVM.
Herald added a subscriber: hiraditya.

This is split off from D67356 <https://reviews.llvm.org/D67356>, since these cases produce a constant,
no real need to keep them in instcombine.

Alive proofs:
https://rise4fun.com/Alive/u7Fk

https://bugs.llvm.org/show_bug.cgi?id=43251


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D67498

Files:
  llvm/lib/Analysis/InstructionSimplify.cpp
  llvm/test/Transforms/InstSimplify/result-of-usub-is-non-zero-and-no-overflow.ll

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