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A comment on The Hunt for the Fastest Zero.

Re:The Hunt for the Fastest Zero by PeterHacker123 on Monday January 20, 2020 @03:40PM (#22101921)
Thumbs up, but at least on macOS both is equally fast :-(
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Re:The Hunt for the Fastest Zero by BeeOnRope on Monday January 20, 2020 @03:41PM (#22101927)
Probably you are using clang, right? As mentioned, clang does the idiom recognition even at -O2.

Try at -O1.

If it's still fast at -O1, I guess the libc++ implementation is different (AFAIK clang uses libstdc++ on Linux but libc++ on OSX).

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