| From: | Ranier Vilela <ranier(dot)vf(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Bertrand Drouvot <bertranddrouvot(dot)pg(at)gmail(dot)com>, Peter Eisentraut <peter(at)eisentraut(dot)org>, pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: define pg_structiszero(addr, s, r) |
| Date: | 2024-10-28 16:29:08 |
| Message-ID: | CAEudQAo7BpBqjP5oTGLNycux+Yi3qNa3WaSLkSVrvN9GbnhQfw@mail.gmail.com |
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| Lists: | pgsql-hackers |
Em seg., 28 de out. de 2024 às 12:08, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> escreveu:
> Ranier Vilela <ranier(dot)vf(at)gmail(dot)com> writes:
> > It seems to me that [reversing the loop direction] is more optimized.
>
> That's far from clear: you're ignoring the possibility that memory
> access logic is better optimized for forward scanning than reverse
> scanning. I'd stick with the forward scan without some extremely
> detailed testing.
>
I don't disagree.
After posting, I was wondering if the first possible is not zero, it should
probably be at the beginning and not at the end.
best regards,
Ranier Vilela
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