Re: call popcount32/64 directly on non-x86 platforms

I wrote:
> On Thu, Aug 12, 2021 at 1:26 AM David Rowley <dgrowleyml@gmail.com> wrote:
> > Closer, but I don't see why there's any need to make the fast and slow
> > functions external.  It should be perfectly fine to keep them static.
> >
> > I didn't test the performance, but the attached works for me.
>
> Thanks for that! I still get a big improvement to on Power8 / gcc 4.8,
but it's not quite as fast as earlier versions, which were around 200ms:
>
> master: 646ms
> v3:     312ms
>
> This machine does seem to be pickier about code layout than any other
I've tried running benchmarks on, but that's still a bit much. In any case,
your version is clearer and has the intended effect, so I plan to commit
that, barring other comments.

Pushed, thanks for looking1

--
John Naylor
EDB: http://www.enterprisedb.com