/usr/web/sources/patch/applied/prof-for-ape/cycles.s

Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/prof-for-ape/cycles.s


#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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