Re: [PATCH 1/4] bitops: Add single_bit_set()

[Andy Shevchenko]

On Mon, Nov 22, 2021 at 02:57:27PM +0200, Andy Shevchenko wrote:
> On Mon, Nov 22, 2021 at 12:42:21PM +0000, Vaittinen, Matti wrote:
> > On 11/22/21 13:28, Andy Shevchenko wrote:

...

> > I think I actually tried using hweight() at some point but don't really 
> > remember why I rolled the single_bit_set. (I remember the hweight() 
> > usage because I had to do some googling as I had never heard term 
> > hamming weight before).
> 
> Oh, it should be a very good reason not to use hweight() since on some
> architectures it might become just one assembly instruction.

(for the sake of educational purposes to us both)
https://vaibhavsagar.com/blog/2019/09/08/popcount/

-- 
With Best Regards,
Andy Shevchenko