Re: New CRC algorithm: Slicing by 8

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От Benny Amorsen
Тема Re: New CRC algorithm: Slicing by 8
Дата
Msg-id m3ac3nnsyd.fsf@ursa.amorsen.dk
обсуждение исходный текст
Ответ на Re: New CRC algorithm: Slicing by 8  ("Gurjeet Singh" <singh.gurjeet@gmail.com>)
Ответы Re: New CRC algorithm: Slicing by 8  (Mark Kirkwood <markir@paradise.net.nz>)
Список pgsql-hackers
>>>>> "MK" == Mark Kirkwood <markir@paradise.net.nz> writes:

MK> Here are the results after building gcc 4.1.2 (repeating results
MK> for gcc 3.4.6 for comparison). I suspect that performance is
MK> probably impacted because gcc 4.1.2 (and also the rest of the
MK> tool-chain) is built with gcc 3.4.6 - but it certainly suggests
MK> that the newer gcc versions don't like the slice-8 algorithm for
MK> some reason.

They don't seem to like the old CRC algorithms either. It is quite
strange, such dramatic performance regressions from 3.x to 4.x are
rare.


/Benny




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