Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?

From: Jeff Law
Date: Mon Nov 15 2010 - 13:46:27 EST


On 11/08/10 03:49, Richard Guenther wrote:
On Mon, Nov 8, 2010 at 12:03 AM, Andi Kleen<andi@xxxxxxxxxxxxxx> wrote:
Andreas Schwab<schwab@xxxxxxxxxxxxxx> 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.

Jeff
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