P0553R4 <bit> Rotating And Counting Functions

[StephanTLavavej]

P0553R4 <bit> Rotating And Counting Functions

This may need compiler support.

[crackedmind]

How i can see, MSVC supports __builtin_clz/__builtin_popcount and some other helpers since 19.23. Can we start start to implement this? :)

[sylveon]

There's _BitScanReverse for clz. Not sure if constexpr though.

[crackedmind]

There's _BitScanReverse for clz. Not sure if constexpr though.

if you will grep c1xx.dll from vc >= 19.23 you can find __builtin_clz and other functions.

And it's work. Tested on local compiler-explorer instance for constexpr functions

[StephanTLavavej]

@barcharcraz is actively working on this. Charlie, would it be useful to submit a draft PR so people can see what you’ve been working on, as I did for Casey’s <coroutine> that I revised?

[crackedmind]

@barcharcraz is actively working on this. Charlie, would it be useful to submit a draft PR so people can see what you’ve been working on, as I did for Casey’s <coroutine> that I revised?

How about lables 'i started' in issues or maybe WIP PRs? I think it can be useful. Specialy, if you start it iternal.