News for hackers. Stuff that matters.

A comment on A neat XOR trick.

Re:A neat XOR trick by someweirdperson on Tuesday December 13, 2022 @07:00AM (#33967725)
count_ones() is a challenge on its own.

https://graphics.stanford.edu/~seander/bithacks.html#CountBi...

[ Parent | on HN ]
Re:A neat XOR trick by averne_ on Tuesday December 13, 2022 @07:36AM (#33968064)
You can just use __builtin_popcount or equivalent, which maps to a single instruction on most platforms.
[ Parent | on HN ]