| From: | Chuck McDevitt <cmcdevitt(at)greenplum(dot)com> |
|---|---|
| To: | Stephen Frost <sfrost(at)snowman(dot)net> |
| Cc: | "<pgsql-hackers(at)postgresql(dot)org>" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [PATCH] backend: compare word-at-a-time in bcTruelen |
| Date: | 2009-06-16 17:57:48 |
| Message-ID: | 2106D8DC89010842BABA5CD03FEA4061CA7CFA16@EXVMBX018-10.exch018.msoutlookonline.net |
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| Thread: | |
| Lists: | pgsql-hackers |
> -----Original Message-----
> From: pgsql-hackers-owner(at)postgresql(dot)org [mailto:pgsql-hackers-
> owner(at)postgresql(dot)org] On Behalf Of Stephen Frost
> Sent: Tuesday, June 16, 2009 5:47 AM
> To: Greg Stark
> Cc: Robert Haas; Jeremy Kerr; <pgsql-hackers(at)postgresql(dot)org>; Alvaro
> Herrera; Stefan Kaltenbrunner; Gurjeet Singh
> Subject: Re: [HACKERS] [PATCH] backend: compare word-at-a-time in
> bcTruelen
>
On 64-bit machines, the native word size is 64-bits (obviously), and comparing 32 bits at a time is much slower than comparing 64 bits at a time.
You might want to consider this.
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