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From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Arjan van de Ven <arjan@infradead.org>, Andi Kleen <ak@muc.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: -freg-struct-return?
Date: Wed, 21 Feb 2007 17:28:37 -0800	[thread overview]
Message-ID: <45DCF1C5.4030006@goop.org> (raw)

We have a number of functions which return small structures (such as
pte_t).  It seems that the kernel is not compiled with
-freg-struct-return, so all these small structures are being returned
via the stack, even though they would fit into registers.

Is there a reason for this?  Would -freg-struct-return be preferred?  It
would make a good compliment to -mregparm.

    J

             reply	other threads:[~2007-02-22  1:30 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-22  1:28 Jeremy Fitzhardinge [this message]
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     ` -freg-struct-return? Jakub Jelinek
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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