Re: Popcount optimization using AVX512

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От Nathan Bossart
Тема Re: Popcount optimization using AVX512
Дата
Msg-id 20240404172840.GB3866970@nathanxps13
обсуждение исходный текст
Ответ на Re: Popcount optimization using AVX512  (Ants Aasma <ants.aasma@cybertec.at>)
Ответы Re: Popcount optimization using AVX512  (Nathan Bossart <nathandbossart@gmail.com>)
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On Thu, Apr 04, 2024 at 04:02:53PM +0300, Ants Aasma wrote:
> Speaking of which, what does bumping up the inlined version threshold
> to 16 do with and without AVX-512 available? Linearly extrapolating
> the 2 and 4 byte numbers it might just come ahead in both cases,
> making the choice easy.

IIRC the inlined version starts losing pretty quickly after 8 bytes.  As I
noted in my previous message, I think we have enough data to switch to your
approach already, so I think it's a moot point.

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com

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