From: Bastien =?ISO-8859-1?Q?Roucari=E8s?= <rouca@debian.org>
To: Thomas Munro <thomas.munro@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>, pgsql-bugs@lists.postgresql.org
Subject: Re: Detection of hadware feature => please do not use signal
Date: Fri, 01 Nov 2024 10:20:03 +0000
Message-ID: <7915750.ZPPAYPQ7GT@portable-bastien>
In-Reply-To: <1637254.1730441792@sss.pgh.pa.us>
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From: Bastien =?ISO-8859-1?Q?Roucari=E8s?= <rouca@debian.org>
Subject: Re: Detection of hadware feature => please do not use signal
Date: Fri, 01 Nov 2024 10:19:46 +0000
Message-ID: <7915750.ZPPAYPQ7GT@portable-bastien>
In-Reply-To: <1637254.1730441792@sss.pgh.pa.us>
MIME-Version: 1.0

Le vendredi 1 novembre 2024, 06:16:32 UTC Tom Lane a =C3=A9crit :
> I wrote:
> > Hmm.  So it seems like we could do this:
> > * Linux, FreeBSD, OpenBSD: do run-time test as recommended
> > * Windows, macOS: assume that supported ARM hardware can do this
> > * anything else: assume no hardware CRC
>=20
> Actually, after chewing on that second point awhile longer,
> how about this modest proposal:
>=20
> * Drop all code for run-time determination of ARM CRC support.
> Assume it's there unless user builds with a -march option that
> says it definitely isn't.
>=20
> Realistically, exactly who is going to be running Postgres 18+
> on ARM hardware that lacks CRC support?  I can think of lots of
> projects that are more worthy of our time than this.
>=20
> (Perhaps it's time to apply the same mindset to x86 CRC support
> too?)

arm64 baseline for debian is without CRC so I will prefer to keep crc32

Bastien
>=20
> 			regards, tom lane
>=20


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