1#define RDTSC BYTE $0x0F; BYTE $0x31 2 3TEXT cycles(SB),1,$0 /* time stamp counter; cycles since power up */ 4 RDTSC 5 MOVL vlong+0(FP), CX /* &vlong */ 6 MOVL AX, 0(CX) /* lo */ 7 MOVL DX, 4(CX) /* hi */ 8 RET 9