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

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Message-ID: <a36005b50905121045s62c16760p3aba003647a572c7@mail.gmail.com>
Date:	Tue, 12 May 2009 10:45:00 -0700
From:	Ulrich Drepper <drepper@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Tobias Doerffel <tobias.doerffel@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Specific support for Intel Atom architecture

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.
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