| From: | John Naylor <johncnaylorls(at)gmail(dot)com> |
|---|---|
| To: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, 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: | 2025-06-24 03:34:12 |
| Message-ID: | CANWCAZbMwQbk+cWPWWk5vzHhWLNw774c7cbDG0X394JX+oF6sA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Jun 23, 2025 at 10:05 PM Nathan Bossart
<nathandbossart(at)gmail(dot)com> wrote:
>
> 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:
> >
> > $ ./configure ...
> > $ make -s
> > pg_crc32c_sse42.c: In function 'pg_comp_crc32c_avx512':
> > pg_crc32c_sse42.c:126:25: warning: implicit declaration of function '_mm512_zextsi128_si512'; did you mean '_mm512_castsi128_si512'? [-Wimplicit-function-declaration]
> > x0 = _mm512_xor_si512(_mm512_zextsi128_si512(_mm_cvtsi32_si128(crc0)), x0);
> > ^~~~~~~~~~~~~~~~~~~~~~
> > _mm512_castsi128_si512
>
> It looks like thse weren't added until GCC 10 [0].
Huh, that's surprising because the Intel manual put it in AVX-512F,
the basic core around which everything else is tacked on.
--
John Naylor
Amazon Web Services
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