aaron.ballman added inline comments.

================
Comment at: clang-tidy/modernize/RawStringLiteralCheck.cpp:71
+  // supported by specific code pages only.
+  if (Bytes.find_if_not(isASCII) != StringRef::npos)
+    return false;
----------------
I am starting to think that this functionality should be refactored because the 
check is now O(N^2) in the worst case because all of the bytes of the string 
need to be touched twice. It would be nice for performance reasons to combine 
this so that there's only a single pass over all of the characters.

What do you think?


https://reviews.llvm.org/D45932



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