linux-kernel - Re: [PATCH] [9/58] x86_64: Always use builtin memcpy on gcc 4.3

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Message-Id: <E1ICOBm-0003zf-Ms@flower>
Date:	Sun, 22 Jul 2007 01:16:42 +0200
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	Andi Kleen <ak@...e.de>
Cc:	jh@...e.cz, patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [9/58] x86_64: Always use builtin memcpy on gcc 4.3

* From: Andi Kleen <ak@...e.de>
* Date: Thu, 19 Jul 2007 11:54:53 +0200 (CEST)
>
> Jan asked to always use the builtin memcpy on gcc 4.3 mainline because
> it should generate better code than the old macro. Let's try it.

Unfortunately such info is hard to find. The discuss@...-64 list is
empty. So, let me ask how this memcpy relates to recently submitted
for glibc one [0]?

[0] <http://permalink.gmane.org/gmane.comp.lib.glibc.alpha/12217>

Also you are enabling rep. string operations for 10h family. Yet manual
says, that while they were improved, there are still various other
preferred optimization cases

Thanks.

> Cc: jh@...e.cz
>
> Signed-off-by: Andi Kleen <ak@...e.de>
>
> ---
>  include/asm-x86_64/string.h |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
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