Messages in this thread | | | Date | Sat, 03 May 2008 18:50:52 +0100 | From | James Courtier-Dutton <> | Subject | Re: i387/FPU init issues... |
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H. Peter Anvin wrote: > 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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