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SubjectRe: Semaphore assembly-code bug
Linus Torvalds wrote:
> 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.


That's how I'm coding the sparse "compiler backend"... the mov's and
add's tend to be tiny instructions (i-cache friendly), and you can often
issue a bunch of them through multiple pipes/ports.

Jeff


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