linux-kernel - -freg-struct-return?

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Date:	Wed, 21 Feb 2007 17:28:37 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Arjan van de Ven <arjan@...radead.org>, Andi Kleen <ak@....de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: -freg-struct-return?

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
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