linux-kernel - Re: -freg-struct-return?

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Message-ID: <45DDE56C.7060704@zytor.com>
Date:	Thu, 22 Feb 2007 10:48:12 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@....de>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: -freg-struct-return?

Andi Kleen wrote:
> On Thu, Feb 22, 2007 at 09:39:04AM -0800, Jeremy Fitzhardinge wrote:
>> H. Peter Anvin wrote:
>>> Sometimes returning small structures is really nice.  If you can pass
>>> them in registers, it's often generates the fastest possible code;
>>> much better than using a pointer. 
>> Yes, but specifically, are there any pieces of assembler which return
>> structures?  It appears there are none (since Ingo got a booting
>> kernel), but there might be something obscure in some corner.
> 
> When I did the x86-64 port I went over all assembler and I can't remember
> anything that did that. Of course there might be out of tree drivers
> that do, but they just have to fix it up.
> 
> BTW would it make sense to have a special announcement list for such changes?
> 

To some degree linux-arch would be a good list for it, but it's closed, 
even to monitor.

	-hpa
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