[PATCH] D12139: Add 'strlen' formation to LoopIdiomRecognize

[Nick Lewycky via llvm-commits]

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This recognizer finds loops of the form:
    for (const char *ptr = p; *ptr; ++ptr, ++len)
      /*empty*/ ;
and converts them into calls to strlen().


Repository:
  rL LLVM

http://reviews.llvm.org/D12139

Files:
  lib/Transforms/Scalar/LoopIdiomRecognize.cpp
  test/Transforms/LoopIdiom/strlen.ll

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