[PATCH] D123631: [InstCombine] Fold memrchr calls with sequences of identical bytes.

[Martin Sebor via Phabricator via llvm-commits]

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This change implements folding of `memrchr` calls with sequences of identical characters.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123631

Files:
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/memrchr-4.ll

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