[PATCH] D126515: [InstCombine] Fold memchr of sequences of same characters

[Martin Sebor via Phabricator via llvm-commits]

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This change enhances the `memchr` library function handler to fold calls with one or two consecutive sequences of the same character, analogously to the corresponding feature recently added to the `memrchr` handler (D123631 <https://reviews.llvm.org/D123631>).  Rather than just one sequence as for `memrchr`, this one handles also two sequences in order to also benefit `strchr`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126515

Files:
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/memchr-6.ll
  llvm/test/Transforms/InstCombine/memchr.ll
  llvm/test/Transforms/InstCombine/strchr-3.ll

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