linux-kernel - Re: [PATCH] i386: optimize memset of 6 and 8 bytes

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Message-Id: <1187402220.2789.2.camel@laptopd505.fenrus.org>
Date:	Fri, 17 Aug 2007 18:57:00 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] i386: optimize memset of 6 and 8 bytes


On Fri, 2007-08-17 at 18:54 -0700, Stephen Hemminger wrote:
> On Fri, 17 Aug 2007 18:49:34 -0700
> Arjan van de Ven <arjan@...radead.org> 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.

.. maybe we should just fix it that way then?

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