[Bug libstdc++/97759] Could std::has_single_bit be faster?

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97759

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
r11-4843 should have removed the small difference between the std and popcount
benchmarks.

I still see a small advantage to arithmetic for skylake i7-6700 CPU @ 3.40GHz
and i7-8650U CPU @ 1.90GHz though.