linux-kernel - Re: [uml-devel] arch/um/sys-i386/setjmp.S: useless #ifdef

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Message-ID: <20060822192814.GA19896@stusta.de>
Date:	Tue, 22 Aug 2006 21:28:14 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Jeff Dike <jdike@...toit.com>
Cc:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [uml-devel] arch/um/sys-i386/setjmp.S: useless #ifdef _REGPARM's?

On Tue, Aug 22, 2006 at 01:42:33PM -0400, Jeff Dike wrote:
> On Tue, Aug 22, 2006 at 06:07:41PM +0200, Adrian Bunk wrote:
> > I didn't find a corresponding open bug in the gcc Bugzilla.
> > 
> > Can someone verify whether it's still present, and if yes, open a gcc 
> > bug?
> 
> Yup, it's easy enough to check.

Thanks.

> > It's set globally in arch/i386/Makefile:
> >   cflags-$(CONFIG_REGPARM) += -mregparm=3
> 
> IIRC, there used to be functions explicitly declared as __regparam or
> something, and that's what I was grepping for.  Does this turn every
> function with three or fewer parameters into a regparam function?
>...

With -mregparm=3, the first up to three parameters that aren't bigger 
than an integer are passed in registers instead of on the stack.

> 				Jeff

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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