[PATCH] D123626: [InstCombine] Fold memrchr calls with constant size of zero or one.

[Martin Sebor via Phabricator via llvm-commits]

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This change implements folding of `memrchr` calls with constant sizes of zero and one, analogously to `memchr`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123626

Files:
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/memrchr-2.ll
  llvm/test/Transforms/InstCombine/memrchr-3.ll
  llvm/test/Transforms/InstCombine/memrchr-4.ll

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