Messages in this thread | | | Date | Sat, 03 May 2008 10:51:58 -0700 | From | "H. Peter Anvin" <> | Subject | Re: i387/FPU init issues... |
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James Courtier-Dutton wrote: > 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. >
I believe that's what I just said...
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