Plan 9 from Bell Labs’s /usr/web/sources/contrib/quanstro/highprec/cycles.s

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Distributed under the MIT License.
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#define RDTSC 		BYTE $0x0F; BYTE $0x31	/* RDTSC, result in AX/DX (lo/hi) */

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

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