| From: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
|---|---|
| To: | Ants Aasma <ants(dot)aasma(at)cybertec(dot)at> |
| Cc: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, "Amonson, Paul D" <paul(dot)d(dot)amonson(at)intel(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Rowley <dgrowleyml(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, "Shankaran, Akash" <akash(dot)shankaran(at)intel(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Popcount optimization using AVX512 |
| Date: | 2024-04-04 17:28:40 |
| Message-ID: | 20240404172840.GB3866970@nathanxps13 |
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| Lists: | pgsql-hackers |
On Thu, Apr 04, 2024 at 04:02:53PM +0300, Ants Aasma wrote:
> Speaking of which, what does bumping up the inlined version threshold
> to 16 do with and without AVX-512 available? Linearly extrapolating
> the 2 and 4 byte numbers it might just come ahead in both cases,
> making the choice easy.
IIRC the inlined version starts losing pretty quickly after 8 bytes. As I
noted in my previous message, I think we have enough data to switch to your
approach already, so I think it's a moot point.
--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com
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