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

On Thu, Aug 12, 2021 at 1:26 AM David Rowley <dgrowleyml(at)gmail(dot)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.

I think I'll leave my v2-0002 aside for now, since it has wider
implications, and I have bigger things to work on.

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