https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71537
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #5) > N.B. for char_traits::char::find() we almost certainly want to use > __builtin_strchr and have the FE expand it in-place in constant expressions, > as the performance of our current code sucks, see PR 66414. Oops, faulty memory - that bug's about string::find not char_traits::find. Our char_traits<char>::find already uses __builtin_memchr (and should continue to do so, which means we need that to be usable in a constexpr function if it isn't already). We still need the generic char_traits<CharT>::find to be constexpr too though.
