On Thu, 29 Dec 2005, Ingo Molnar wrote:
> > I'd solve it like this instead (on top of your latest patches):
>
> thanks, applied.
>
> > + "1: ldrex %0, [%3] \n"
> > + "subs %1, %0, #1 \n"
> > + "strexeq %2, %1, [%3] \n"
> > + "movlt %0, #0 \n"
> > + "cmpeq %2, #0 \n"
> > + "bgt 1b \n"
>
> so we are back to what is in essence a cmpxchg implementation?
A limited cmpxchg. Using the generic cmpxchg for this would need either
9 or 10 instructions instead of 6.
Nicolas
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