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help / color / mirror / Atom feedFrom: Thomas Munro <[email protected]>
To: Heikki Linnakangas <[email protected]>
Cc: Srirama Kucherlapati <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: Bruce Momjian <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: Noah Misch <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Tristan Partin <[email protected]>
Cc: wenhui qiu <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: AIX support
Date: Fri, 25 Apr 2025 13:31:46 +1200
Message-ID: <CA+hUKGLM7j65kEf9p_v11s+aonjZztyS_3xmAOeuzmcrOQ+P8w@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
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On Mon, Apr 7, 2025 at 10:04 PM Heikki Linnakangas <[email protected]> wrote:
> I'm surprised how big the difference is, because I actually expected the
> compiler to detect the memory-zeroing loop and replace it with some
> fancy vector instructions (does powerpc have any?).
It certainly does, and we've played with explicit AltiVec
vectorisation before with the idea that our abstraction over x86 and
ARM instructions could be extended to POWER, but that was just trying
stuff and learning while wondering if those abstractions are general
enough and how well all the instructions match up. No one with modern
hardware and a vested interest has seriously investigated it. That's
independent of automatic vectorisation done by the compiler or libc,
and I guess it would not really be AIX-specific since it would also
apply to Linux on POWER. One of those patches is linked from this
small list of "ideas for a future PostgreSQL/AIX maintainer":
https://wiki.postgresql.org/wiki/AIX
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Subject: Re: AIX support
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