| From: | "Devulapalli, Raghuveer" <raghuveer(dot)devulapalli(at)intel(dot)com> |
|---|---|
| To: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
| Cc: | "Shankaran, Akash" <akash(dot)shankaran(at)intel(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Rowley <dgrowleyml(at)gmail(dot)com>, Ants Aasma <ants(dot)aasma(at)cybertec(dot)at>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, "Amonson, Paul D" <paul(dot)d(dot)amonson(at)intel(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, "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: | 2024-04-18 22:11:08 |
| Message-ID: | PH8PR11MB82863AB8040AD090909DC18BFB0E2@PH8PR11MB8286.namprd11.prod.outlook.com |
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| Lists: | pgsql-hackers |
> On that note, is it necessary to also check for avx512f? At the moment, we are assuming that's supported if the other AVX-512 instructions are available.
No, it's not needed. There are no CPU's with avx512bw/avx512popcnt without avx512f. Unfortunately though, avx512popcnt does not mean avx512bw (I think the deprecated Xeon Phi processors falls in this category) which is why we need both.
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