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From: Nathan Bossart <nathandbossart@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: David Rowley <dgrowleyml@gmail.com>
Cc: Ants Aasma <ants.aasma@cybertec.at>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Amonson, Paul D <paul.d.amonson@intel.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Shankaran, Akash <akash.shankaran@intel.com>
Cc: Noah Misch <noah@leadboat.com>
Cc: Matthias van de Meent <boekewurm+postgres@gmail.com>
Cc: pgsql-hackers@lists.postgresql.org <pgsql-hackers@lists.postgresql.org>
Subject: Re: Popcount optimization using AVX512
Date: Sun, 7 Apr 2024 20:30:02 -0500
Message-ID: <20240408013002.GA1352058@nathanxps13> (raw)
In-Reply-To: <20240408012332.GA1351547@nathanxps13>
References: <20240405041543.GA4100924@nathanxps13>
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	<20240405125844.GB4102502@nathanxps13>
	<20240405153811.GA9352@nathanxps13>
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	<CAApHDvq32zJMbwOg69fAogJ9mFDdYyYp8-1A4xiFMv63HnSZ-A@mail.gmail.com>
	<20240406194101.GA533391@nathanxps13>
	<2999492.1712536932@sss.pgh.pa.us>
	<20240408012332.GA1351547@nathanxps13>

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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