From: Andi Kleen <ak@suse.de>
To: Jan Hubicka <jh@suse.cz>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: Allow preferred-stack-boundary of 3 for x86-64
Date: Fri, 27 Jul 2007 22:33:00 -0000 [thread overview]
Message-ID: <200707280007.54813.ak@suse.de> (raw)
In-Reply-To: <20070723230503.GA10270@kam.mff.cuni.cz>
On Tuesday 24 July 2007 01:05:03 Jan Hubicka wrote:
> Hi,
> Andi Kleen raised point that while x86-64 ABI requires 16byte alignment,
> kernel preffers to save stack psace by 8 byte alignment even though it
> breaks some of features (such as XMM support or variadic arguments of
> types aligned to 16 bytes, such as long double).
>
> This patch thus makes GCC to tolerate this option and updates
> documentation accrodingly. I will install it tomorrow if there are no
> complains. Bootstrapped/regtested i686-linux.
I tested the patch now and I get a ICE while compiling the x86_64 linux kernel
with -mpreferred-stack-boundary=3 and 070727 SVN checkout + patch
/home/lsrc/quilt/linux/init/do_mounts.c: In function 'change_floppy':
/home/lsrc/quilt/linux/init/do_mounts.c:390: internal compiler error: in ix86_compute_frame_layout, at config/i386/i386.c:5745
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
Test case is in http://www.firstfloor.org/~andi/do_mounts.i
Compile with -mpreferred-stack-boundary=3 -Os
-Andi
next prev parent reply other threads:[~2007-07-27 22:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-24 0:54 Jan Hubicka
2007-07-27 22:33 ` Andi Kleen [this message]
2007-07-31 5:03 ` Jan Hubicka
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