#define RDTSC           BYTE $0x0F; BYTE $0x31

TEXT cycles(SB),1,$0            /* time stamp counter; cycles since power up */
       RDTSC
       MOVL    vlong+0(FP), CX /* &vlong */
       MOVL    AX, 0(CX)       /* lo */
       MOVL    DX, 4(CX)       /* hi */
       RET

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