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Date:	Fri, 17 Aug 2007 18:54:52 -0700
From:	Stephen Hemminger <>
To:	Arjan van de Ven <>
Cc:	"David S. Miller" <>,
	Andrew Morton <>,,
Subject: Re: [PATCH] i386: optimize memset of 6 and 8 bytes

On Fri, 17 Aug 2007 18:49:34 -0700
Arjan van de Ven <> wrote:

> On Fri, 2007-08-17 at 16:50 -0700, Stephen Hemminger wrote:
> > Tne network code does memset for 6 and 8 byte values, that can easily
> > be optimized into simple assignments without string instructions.
> so... question.
> Why are we doing this by hand? Wouldn't gcc just generate this code in
> the first place (when using __builtin_memset)? I very much suspect it
> would (and if some version doesn't.... we really ought to get that
> fixed)

i386 and x86_64 are not using __builtin_memset, as least from the
code that I see generated.

Stephen Hemminger <>
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