| From: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
|---|---|
| To: | Tomas Vondra <tomas(at)vondra(dot)me> |
| Cc: | Andy Fan <zhihuifan1213(at)163(dot)com>, John Naylor <johncnaylorls(at)gmail(dot)com>, "Devulapalli, Raghuveer" <raghuveer(dot)devulapalli(at)intel(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: | 2025-06-14 13:56:34 |
| Message-ID: | aE1_knL40G9Wq_zp@nathan |
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| Lists: | pgsql-hackers |
On Sat, Jun 14, 2025 at 03:47:33PM +0200, Tomas Vondra wrote:
> I suggest you try with a newer gcc, perhaps 13.4. There's been a bunch
> of fixes related to AVX512 since 13.0, chances are this was already
> fixed. I don't see this failure on 14.3.1.
From the config.log, it looks like Andy is using clang:
configure:3998: clang --version >&5
clang version 18.1.6 (https://gitee.com/mirrors/llvm-project.git 1118c2e05e67a36ed8ca250524525cdb66a55256)
And I see -O0 used, too, which would match the existing report [0],
although that report is for clang 19.1.7.
I'm also genuinely curious why folks are using -O0...
[0] https://postgr.es/m/CAE-ML%2B-OV6p9uvCFBcSQjZUEh__y0h-KjN%2BBseyGJHt7u8EP%2Bw%40mail.gmail.com
--
nathan
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