Re: Semaphore assembly-code bug

From: Denis Vlasenko
Date: Sat Oct 30 2004 - 04:31:52 EST


On Saturday 30 October 2004 05:13, Andi Kleen wrote:
> Linus Torvalds <torvalds@xxxxxxxx> writes:
>
> > Anyway, it's quite likely that for several CPU's the fastest sequence ends
> > up actually being
> >
> > movl 4(%esp),%ecx
> > movl 8(%esp),%edx
> > movl 12(%esp),%eax
> > addl $16,%esp
> >
> > which is also one of the biggest alternatives.
>
> For K8 it should be the fastest way. K7 probably too.

Pity. I always loved 1 byte insns :)

/me hopes that K8 rev E or K9 will have optimized pop.
--
vda

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