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

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Message-ID: <20070222112207.GA10190@muc.de>
Date:	Thu, 22 Feb 2007 12:22:07 +0100
From:	Andi Kleen <ak@....de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: -freg-struct-return?

On Thu, Feb 22, 2007 at 12:09:04AM -0800, Jeremy Fitzhardinge wrote:
> Arjan van de Ven wrote:
> > Do we know how many gcc bugs this has? (regparm used to have many)
> > other than that.. sounds like a win...
> >   
> 
> The documentation suggests that its the preferred mode of operation, and
> that its the default on platforms where gcc is the primary compiler.  So
> the fact that it isn't for Linux suggests either an oversight or that it
> is actually broken...
> 
> Do we have much assembler which cares about the struct return calling
> convention?  If not, it should be a fairly easy test.

I didn't think we had any that returned structures.

-Andi
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