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help / color / mirror / Atom feedFrom: Amonson, Paul D <[email protected]>
To: Nathan Bossart <[email protected]>
To: David Rowley <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Shankaran, Akash <[email protected]>
Cc: Noah Misch <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Matthias van de Meent <[email protected]>
Cc: [email protected] <[email protected]>
Subject: RE: Popcount optimization using AVX512
Date: Mon, 18 Mar 2024 16:07:40 +0000
Message-ID: <BL1PR11MB5304070E33F7DD0520445B77DC2D2@BL1PR11MB5304.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20240318152902.GA2850@nathanxps13>
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<CAApHDvrb7MJRB6JuKLDEY2x_LKdFHwVbogpjZBCX547i5+rXOQ@mail.gmail.com>
<20240318152902.GA2850@nathanxps13>
Won't I still need the runtime checks? If I compile with a compiler supporting the HW "feature" but run on HW without that feature, I will want to avoid faults due to illegal operations. Won't that also affect performance?
Paul
> -----Original Message-----
> From: Nathan Bossart <[email protected]>
> Sent: Monday, March 18, 2024 8:29 AM
> To: David Rowley <[email protected]>
> Cc: Amonson, Paul D <[email protected]>; Andres Freund
> <[email protected]>; Alvaro Herrera <[email protected]>; Shankaran,
> Akash <[email protected]>; Noah Misch <[email protected]>;
> Tom Lane <[email protected]>; Matthias van de Meent
> <[email protected]>; [email protected]
> Subject: Re: Popcount optimization using AVX512
>
> On Mon, Mar 18, 2024 at 09:56:32AM +1300, David Rowley wrote:
> > Maybe it's worth exploring something along the lines of the attached
> > before doing the AVX512 stuff. It seems like a pretty good speed-up
> > and will apply for CPUs without AVX512 support.
>
> +1
>
> --
> Nathan Bossart
> Amazon Web Services: https://aws.amazon.com
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Subject: RE: Popcount optimization using AVX512
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