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From: Jakub Jelinek <jakub@redhat.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Arjan van de Ven <arjan@infradead.org>, Andi Kleen <ak@muc.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: -freg-struct-return?
Date: Thu, 22 Feb 2007 04:50:39 -0500	[thread overview]
Message-ID: <20070222095039.GR10425@devserv.devel.redhat.com> (raw)
In-Reply-To: <45DD4FA0.5030205@goop.org>

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...

It is used for Linux on many architectures (x86_64, sparc64, ia64,
ppc{,64}, arm, sh, m68k to name just a few), but it is an ABI decision,
so e.g. on i386 is not used by default as the ABI mandates structs/unions
are returned in memory.

	Jakub

  parent reply	other threads:[~2007-02-22  9:53 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-22  1:28 -freg-struct-return? Jeremy Fitzhardinge
2007-02-22  8:04 ` -freg-struct-return? Arjan van de Ven
2007-02-22  8:09   ` -freg-struct-return? Jeremy Fitzhardinge
2007-02-22  8:15     ` -freg-struct-return? Arjan van de Ven
2007-02-22  8:30       ` -freg-struct-return? Jeremy Fitzhardinge
2007-02-22  8:37       ` -freg-struct-return? Ingo Molnar
2007-02-22  8:38     ` [patch] x86: add -freg-struct-return to CFLAGS Ingo Molnar
2007-02-22 11:23       ` Andi Kleen
2007-02-22 11:27         ` Arjan van de Ven
2007-02-22 18:35       ` Adrian Bunk
2007-02-22 22:31         ` H. Peter Anvin
2007-02-22  9:50     ` Jakub Jelinek [this message]
2007-02-22 11:22     ` -freg-struct-return? Andi Kleen
2007-02-22 16:42       ` -freg-struct-return? H. Peter Anvin
2007-02-22 17:39         ` -freg-struct-return? Jeremy Fitzhardinge
2007-02-22 18:36           ` -freg-struct-return? Andi Kleen
2007-02-22 18:48             ` -freg-struct-return? H. Peter Anvin
2007-02-23  0:21               ` -freg-struct-return? Andi Kleen
2007-02-22 18:56             ` -freg-struct-return? Jan Engelhardt
2007-02-22 19:12               ` -freg-struct-return? H. Peter Anvin

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