shithub: front

ref: c309f466eff33a331f9a8d8c8b18cfe613c1d3f4
dir: /sys/src/libc/386/cycles.s/

View raw version 
#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