Messages in this thread | | | Date | Mon, 15 Nov 2010 15:58:24 -0700 | From | Jeff Law <> | 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@redhat.com> wrote: >> On 11/08/10 03:49, Richard Guenther wrote: >>> On Mon, Nov 8, 2010 at 12:03 AM, Andi Kleen<andi@firstfloor.org> wrote: >>>> Andreas Schwab<schwab@linux-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
| |