| From: | "Amonson, Paul D" <paul(dot)d(dot)amonson(at)intel(dot)com> |
|---|---|
| To: | Nathan Bossart <nathandbossart(at)gmail(dot)com>, David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, "Shankaran, Akash" <akash(dot)shankaran(at)intel(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "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: | 2024-03-18 21:22:43 |
| Message-ID: | BL1PR11MB53043A6B4224FDBC03D47B6EDC2D2@BL1PR11MB5304.namprd11.prod.outlook.com |
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| Lists: | pgsql-hackers |
> -----Original Message-----
> From: Nathan Bossart <nathandbossart(at)gmail(dot)com>
> Sent: Monday, March 18, 2024 2:08 PM
> To: David Rowley <dgrowleyml(at)gmail(dot)com>
> Cc: Amonson, Paul D <paul(dot)d(dot)amonson(at)intel(dot)com>; Andres Freund
>...
>
> The only reason I left it out was because I couldn't convince myself that it
> wasn't dead code, given we assume that popcntq is available in
> pg_popcount64_fast() today. But I don't see any harm in adding that just in
> case.
I am not sure how to read this. Does this mean that for popcount32_fast and popcount64_fast I can assume that the x86(_64) instructions exists and stop doing the runtime checks for instruction availability?
Thanks,
Paul
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