| 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 21:48:57 |
| Message-ID: | PH8PR11MB82862F0F720DABB913AA31B3FBFC2@PH8PR11MB8286.namprd11.prod.outlook.com |
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| Lists: | pgsql-hackers |
> I think the idea behind USE_SSE42_CRC32C is to avoid the function pointer
> overhead if possible. I looked at switching to always using runtime checks for this
> stuff, and we concluded that we'd better not [0].
>
> [0] https://postgr.es/m/flat/20231030161706.GA3011%40nathanxps13
Does that mean we want this feature for the new PCLMUL (and AVX-512) crc32c implementations too? The code for that will look a little ugly, I might need to think about a cleaner way to do this.
Raghuveer
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