| From: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | David Rowley <dgrowleyml(at)gmail(dot)com>, Ants Aasma <ants(dot)aasma(at)cybertec(dot)at>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, "Amonson, Paul D" <paul(dot)d(dot)amonson(at)intel(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, "Shankaran, Akash" <akash(dot)shankaran(at)intel(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Popcount optimization using AVX512 |
| Date: | 2024-04-08 01:30:02 |
| Message-ID: | 20240408013002.GA1352058@nathanxps13 |
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| Lists: | pgsql-hackers |
On Sun, Apr 07, 2024 at 08:23:32PM -0500, Nathan Bossart wrote:
> The Intel documentation for _mm256_undefined_si256() [0]
> indicates that it is intended to return "undefined elements," so it seems
> like the use of an uninitialized variable might be intentional.
See also https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=72af61b122.
--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com
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