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SubjectRe: [PATCH] change name of rep_nop
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>   Hello,
> > __asm__ __volatile__("rep;nop");
>
> "The behavior of the REP prefix is undefined when used with non-string
> instructions." page 3-404 of Intel documentation, in "CHAPTER 3,
> INSTRUCTION SET REFERENCE"...
>
> How about: __asm__ __volatile__("loop ." : "+c" (nbloop)); ?

rep nop is a magic instruction to powersave momentarily on the Pentium 4.
It happens to be a true nop on the older processors
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