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Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?
- From: Richard Guenther <richard dot guenther at gmail dot com>
- To: Andi Kleen <andi at firstfloor dot org>
- Cc: Andreas Schwab <schwab at linux-m68k dot org>, Jim <jim876 at xs4all dot nl>, Linux Kernel Mailing List <linux-kernel at vger dot kernel dot org>, gcc at gcc dot gnu dot org
- Date: Mon, 8 Nov 2010 11:49:13 +0100
- Subject: Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?
- References: <4CD538CA.8010901@xs4all.nl> <87wroostw3.fsf@basil.nowhere.org> <m2hbfsu57i.fsf@igel.home> <87k4kospnd.fsf@basil.nowhere.org>
On Mon, Nov 8, 2010 at 12:03 AM, Andi Kleen <andi@firstfloor.org> wrote:
> Andreas Schwab <schwab@linux-m68k.org> writes:
>>
>> The asm fails to mention that it modifies *regs.
>
> It has a memory clobber, that should be enough, no?
No. A memory clobber does not cover automatic storage.
Btw, I can't see a testcase anywhere so I just assume Andreas got
it right as usual.
Richard.
> Besides in any case it cannot be eliminated because it has
> valid non dead inputs and outputs.
>
> -Andi
> --
> ak@linux.intel.com -- Speaking for myself only.
>