Date: Wed, 12 Dec 2007 20:32:13 +0100
From: Andi Kleen <andi@firstfloor.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>, Rene Herman <rene.herman@gmail.com>,
       Linux Kernel <linux-kernel@vger.kernel.org>, dpreed@reed.com,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, pavel@ucw.cz, andi@firstfloor.org,
       rol@as2917.net, Krzysztof Halasa <khc@pm.waw.pl>, david@davidnewall.com,
       john@stoffel.org, linux-os@analogic.com
Subject: Re: [RFT] Port 0x80 I/O speed
Message-ID: <20071212193213.GF21864@one.firstfloor.org>
References: <475F1DC6.5090403@keyaccess.nl> <20071212052304.GB20883@fattire.cabal.ca> <476035C0.1040708@zytor.com>
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> "=A" works on 32-bit systems (only), obviously, and gcc will generally 
> produce slightly better code as a result (gcc could really use a 
> register renaming/copy propagation step *after* multi-register entities 

I believe gcc 4.3 (or maybe 4.2) does that already -- it splits them much 
earlier.

-Andi
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