linux-kernel - Re: Specific support for Intel Atom architecture

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Date:	Wed, 13 May 2009 22:04:13 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Tobias Doerffel <tobias.doerffel@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Specific support for Intel Atom architecture

On Tue, 2009-05-12 at 10:45 -0700, Ulrich Drepper wrote:
> On Tue, May 12, 2009 at 8:04 AM, Andi Kleen <andi@...stfloor.org> wrote:
> > The problem is that you can't express the situations where
> > movbe is better than bswap (you need both and the old and the new
> > value) in inline assembler in a way that gcc decides automatically.
> 
> True.  But I was mostly thinking about loads from memory.  A quick
> search for ntoh*/hton* shows code like
> 
>         u_int16_t queue_num = ntohs(nfmsg->res_id);
> 
> If there would be a ntohs_load() macro movbe could be used.

It's called be16_to_cpup, or on x86, swab16p()


Cheers,

Harvey

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