On Mon, Mar 18, 2002 at 03:18:04PM -0800, Carl Spalletta wrote:
> For example in arch/i386/lib/delay.c:
>
> 71 __asm__("mull %0"
> 72 :"=d" (xloops), "=&a" (d0)
> 73 :"1" (xloops),"" (current_cpu_data.loops_per_jiffy));
> 74 __delay(xloops * HZ);
>
> It's pretty obvious that eax gets clobbered. Why is it unlisted?
gcc can see it is clobbered via the "=&a". Clobberlists are for things
gcc can't see.
> Does the answer to this question apply in all cases? What about memory
> clobbers - how do they happen?
when memory gets touched in the asm that isn't specified as an output
in the inline asm afaik
regards
john
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