[PATCH] D128011: [SimplifyLibCalls] Transform memchr(STR C, N) to chain of ORs

[Dávid Bolvanský via Phabricator via llvm-commits]

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Motivation:

  #include <string_view>
  
  size_t findFirst_ABCDEF(std::string_view sv) {
    return sv.find_first_of("ABCDEF");
  }

memchr("ABCDEF", C,  6) != NULL -> (C == 'A' || C == 'B' || C == 'C' || C == 'D' || C == 'E' || C == 'F') != 0


https://reviews.llvm.org/D128011

Files:
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/memchr-7.ll

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