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Date: Mon, 15 Nov 2010 23:07:15 +0100 From: Richard Guenther <richard.guenther@...il.com> To: Jeff Law <law@...hat.com> Cc: Andi Kleen <andi@...stfloor.org>, Andreas Schwab <schwab@...ux-m68k.org>, Jim <jim876@...all.nl>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, gcc@....gnu.org Subject: Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ? On Mon, Nov 15, 2010 at 7:45 PM, Jeff Law <law@...hat.com> wrote: > On 11/08/10 03:49, Richard Guenther wrote: >> >> On Mon, Nov 8, 2010 at 12:03 AM, Andi Kleen<andi@...stfloor.org> wrote: >>> >>> Andreas Schwab<schwab@...ux-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. > > A memory clobber should clobber anything in memory, including autos in > memory; if it doesn't, then that seems like a major problem. I'd like to > see the rationale behind not clobbering autos in memory. Non-address taken automatic storage. (note that we don't excercise this in optimization yet) It's difficult to model thins kind of non-aliased memory with this kind of aliasing mechanism (apart from taking all asms as clobbering everything as we currently do). Richard. > Jeff > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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