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Date: Mon, 08 Nov 2010 12:20:02 +0100 From: Andi Kleen <andi@...stfloor.org> To: Richard Guenther <richard.guenther@...il.com> 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 ? 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. -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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