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(nasm.info)Section B.4.271

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B.4.271. `RDPMC': Read Performance-Monitoring Counters
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     RDPMC                         ; 0F 33                [P6]

   `RDPMC' reads the processor performance-monitoring counter whose
index is stored in `ECX', and stores the result in `EDX:EAX'.

   This instruction is available on P6 and later processors and on MMX
class processors.