| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
| Cc: | John Naylor <johncnaylorls(at)gmail(dot)com>, Andy Fan <zhihuifan1213(at)163(dot)com>, "Devulapalli, Raghuveer" <raghuveer(dot)devulapalli(at)intel(dot)com>, Jesper Pedersen <jesperpedersen(dot)db(at)gmail(dot)com>, Tomas Vondra <tomas(at)vondra(dot)me>, "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: | 2025-06-23 15:10:45 |
| Message-ID: | 3353158.1750691445@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Nathan Bossart <nathandbossart(at)gmail(dot)com> writes:
> On Mon, Jun 23, 2025 at 10:51:21AM -0400, Tom Lane wrote:
>> This has broken the build completely on my RHEL8 x86_64 box,
>> with gcc 8.5.0:
> Unfortunately, this will probably require more than replacing
> _mm512_castsi512_si128 with _mm512_zextsi512_si128 because the latter
> doesn't exist.
I was imagining just including _mm512_zextsi128_si512() in the
code being tested during configure, so that we fall back to
the non-AVX-512 code if the compiler is too old to have it.
I don't really feel a need to work harder than that.
regards, tom lane
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