On Mon, Nov 8, 2010 at 12:20 PM, Andi Kleen <a...@firstfloor.org> wrote: > Richard Guenther <richard.guent...@gmail.com> writes: > >> On Mon, Nov 8, 2010 at 12:03 AM, Andi Kleen <a...@firstfloor.org> wrote: >>> Andreas Schwab <sch...@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. > > 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 > > -- > a...@linux.intel.com -- Speaking for myself only. >
