That's assuming you're ok with your program not running on some older cpus.
That and that you're not willing to entertain splitting the manual version as #[cfg(not(target_feature = "bmi2"))] fallback implementation. For something already down to ~ 1 ns both of those may well be very reasonable assumptions of course.
alt Hacker News
That and that you're not willing to entertain splitting the manual version as #[cfg(not(target_feature = "bmi2"))] fallback implementation. For something already down to ~ 1 ns both of those may well be very reasonable assumptions of course.