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