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Date: Mon, 15 Nov 2010 15:58:24 -0700 From: Jeff Law <law@...hat.com> To: Richard Guenther <richard.guenther@...il.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 11/15/10 15:07, Richard Guenther wrote: > 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) If the address of the auto isn't taken, then why is the object in memory to begin with (with the obvious exception for aggregates). 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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