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

[Martin Sebor via Phabricator via llvm-commits]

msebor added a comment.

Something like this seems to do the right thing (`s` is a container like `StringRef`):

  int last = 0;
  int n = std::count_if (s.begin(), s.end(),
                         [&last](char c) {
                           bool ret = (unsigned char)c > (unsigned char)last + 1;
                           last = c;
                           return ret; });

(It would be a bit more involved if it had to handle different charsets between the host and the target.)


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  https://reviews.llvm.org/D128011/new/

https://reviews.llvm.org/D128011