| From: | Andy Fan <zhihuifan1213(at)163(dot)com> |
|---|---|
| To: | "Devulapalli, Raghuveer" <raghuveer(dot)devulapalli(at)intel(dot)com> |
| Cc: | Nathan Bossart <nathandbossart(at)gmail(dot)com>, John Naylor <johncnaylorls(at)gmail(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: | 2025-06-16 23:40:19 |
| Message-ID: | 87bjqncl24.fsf@163.com |
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| Lists: | pgsql-hackers |
"Devulapalli, Raghuveer" <raghuveer(dot)devulapalli(at)intel(dot)com> writes:
> Great catch! From the intrinsic manual:
>
> Cast vector of type __m128i to type __m512i; the upper 384 bits of the
> result are undefined.
Just be curious, what kind of optimization (like what -O2 does) could
mask this issue?
> Replacing that with _mm512_zextsi128_si512 fixes the problem.
congratulations!
--
Best Regards
Andy Fan
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