| From: | "Devulapalli, Raghuveer" <raghuveer(dot)devulapalli(at)intel(dot)com> |
|---|---|
| To: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
| Cc: | John Naylor <johncnaylorls(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "Shankaran, Akash" <akash(dot)shankaran(at)intel(dot)com> |
| Subject: | RE: Improve CRC32C performance on SSE4.2 |
| Date: | 2025-02-12 22:12:20 |
| Message-ID: | PH8PR11MB8286DABE98519B4A7C134EA7FBFC2@PH8PR11MB8286.namprd11.prod.outlook.com |
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| Lists: | pgsql-hackers |
> Well, I suspect the AVX-512 version will pretty much always need the runtime
> check given that its not available on a lot of newer hardware and requires a
> bunch of extra runtime checks (see pg_popcount_avx512.c). But it might be
> worth doing for PCLMUL. Otherwise, I think we'd have to leave out the PCLMUL
> optimizations if built with -msse4.2 -mpclmul because we don't want to regress
> existing -msse4.2 users with a runtime check.
Sounds good to me. Although, users building with just -msse4.2 will now encounter an
an additional pclmul runtime check. That would be a regression unless they update to
building with both -msse4.2 and -mpclmul.
Raghuveer
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