H. Peter Anvin wrote:
quoted text
> Thomas Gleixner wrote:
>>
>> Jan, are you sure that P3 knows the P6 NOPs ? AFAICT its P4, but I
>> have to dig up the manuals.
>>
>
> Pentium III is the P6 core, so it will.
>
> Intel explicitly documents "all processors with family 6 or F."
>
> -hpa

 From the intel manual

0F 1F /0 NOP
The multi-byte form of NOP is available on processors with model encoding:
• CPUID.01H.EAX[Bytes 11:8] = 0110B or 1111B
The multi-byte NOP instruction does not alter the content of a register 
and will not
issue a memory operation. The instruction’s operation is the same in 
non-64-bit
modes and 64-bit mode.


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