Re: [PATCH] Add pg_lfind8_nonzero()

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От Peter Eisentraut
Тема Re: [PATCH] Add pg_lfind8_nonzero()
Дата
Msg-id 87dd2977-2cb3-4d6a-86b0-8392d20dc693@eisentraut.org
обсуждение исходный текст
Ответ на [PATCH] Add pg_lfind8_nonzero()  ("cca5507" <cca5507@qq.com>)
Ответы Re: [PATCH] Add pg_lfind8_nonzero()
Список pgsql-hackers
On 14.12.25 14:33, cca5507 wrote:
> With pg_lfind8_nonzero(), we can write the code like this:
> 
> ```
>     if (likely(numberOfAttributes > 0))
>         hasnull = pg_lfind8_nonzero((uint8 *) isnull, numberOfAttributes);
> ```
> 
> The pg_lfind8_nonzero() is faster because we can handle 8 bool values at a time.

Maybe you could try popcount for this?

     hasnull = (pg_popcount((char *) isnull, numberOfAttributes) > 0);




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