From: Mike Frysinger <vapier@gentoo.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH V2 0/3] make memcpy and memset faster
Date: Thu, 8 Oct 2009 17:30:49 -0400 [thread overview]
Message-ID: <200910081730.51010.vapier@gentoo.org> (raw)
In-Reply-To: <cover.1255000877.git.rubini@unipv.it>
On Thursday 08 October 2009 07:29:51 Alessandro Rubini wrote:
> Similarly, I'm not interested in "4 bytes at a time, then 1 at a time"
> as it's quite a corner case. If such optimizations are really useful,
> then we'd better have hand-crafted assembly for each arch, possibly
> lifted from glibc.
why ? it's trivial to implement with little code impact. have your code run
while the len is larger than 4 (sizeof-whatever), then fall through to the
loop that runs while the len is larger than 0 instead of immediately
returning.
-mike
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prev parent reply other threads:[~2009-10-08 21:30 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-08 11:29 [U-Boot] [PATCH V2 0/3] make memcpy and memset faster Alessandro Rubini
2009-10-08 11:30 ` [U-Boot] [PATCH V2 1/3] memcpy: copy one word at a time if possible Alessandro Rubini
2009-10-08 15:12 ` Peter Tyser
2009-10-08 16:00 ` Alessandro Rubini
2009-10-08 16:30 ` Peter Tyser
2009-10-08 18:23 ` Alessandro Rubini
2009-10-08 19:09 ` Peter Tyser
2009-10-08 19:17 ` Alessandro Rubini
2009-10-08 20:40 ` Wolfgang Denk
2009-10-08 20:47 ` Wolfgang Denk
2009-10-08 19:14 ` Mike Frysinger
2009-10-08 20:44 ` Wolfgang Denk
2009-10-09 4:42 ` Chris Moore
2009-10-09 10:11 ` Mark Jackson
2009-10-09 10:26 ` Mike Frysinger
2009-10-11 7:06 ` Chris Moore
2009-10-09 11:12 ` Wolfgang Denk
2009-10-08 11:30 ` [U-Boot] [PATCH V2 2/3] memset: fill " Alessandro Rubini
2009-10-08 20:46 ` Wolfgang Denk
2009-10-08 11:30 ` [U-Boot] [PATCH V2 3/3] lcd: remove '#if 0' 32-bit scroll, now memcpy does it Alessandro Rubini
2009-11-22 22:34 ` Wolfgang Denk
2009-11-24 23:04 ` Anatolij Gustschin
2009-10-08 20:36 ` [U-Boot] [PATCH V2 0/3] make memcpy and memset faster Wolfgang Denk
2009-10-08 21:30 ` Mike Frysinger [this message]
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