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Date: Mon, 8 Nov 2010 12:20:46 +0100 From: Richard Guenther <richard.guenther@...il.com> To: Andi Kleen <andi@...stfloor.org> Cc: 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 8, 2010 at 12:20 PM, Andi Kleen <andi@...stfloor.org> wrote: > Richard Guenther <richard.guenther@...il.com> writes: > >> 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. > > That's a separate problem. > >> Btw, I can't see a testcase anywhere so I just assume Andreas got >> it right as usual. > > An asm with live inputs and outputs should never be optimized > way. If 4.5.1 started doing that it's seriously broken. Please provide a testcase, such asms can be optimized if the outputs are dead. Richard. > -Andi > > -- > ak@...ux.intel.com -- Speaking for myself only. > -- 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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