Re: refactor architecture-specific popcount code

On Thu, Feb 05, 2026 at 02:48:44PM +0700, John Naylor wrote:
> On Thu, Feb 5, 2026 at 4:43 AM Nathan Bossart <nathandbossart(at)gmail(dot)com> wrote:
>> Sure. I'm tempted to suggest that we only use the plain C version here,
>> too. The SSE4.2 bms_num_members() test I did yesterday used it and showed
>> improvement at one word. If we do that, we can rip out even more code
>> since we no longer need the popcount built-ins.
>
> Unlike the 32-bit case, people do run production on 64-bit platforms
> that are not Arm/x86, so that would require effort to see if the
> builtins are worth it for them. That seems like a separate effort. I
> can help with that, but let's get the tested stuff in first.

Alright. I moved that to a new 0004 patch that we can consider separately
once 0001-0003 have been committed.

--
nathan