linux-kernel - Re: [RFT] Port 0x80 I/O speed

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Date:	Wed, 12 Dec 2007 11:43:03 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Kyle McMartin <kyle@...artin.ca>,
	Rene Herman <rene.herman@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>, dpreed@...d.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>, pavel@....cz,
	rol@...917.net, Krzysztof Halasa <khc@...waw.pl>,
	david@...idnewall.com, john@...ffel.org, linux-os@...logic.com
Subject: Re: [RFT] Port 0x80 I/O speed

Andi Kleen wrote:
>> "=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.

Probably 4.3, then.  I don't see 4.2 doing that, or at least not very 
successfully.  Which is fine, I'm sure they had bigger fish to fry. 
Good to hear it has gotten some attention recently.

	-hpa
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