Plan 9 from Bell Labs’s /usr/web/sources/patch/maybe/ape-updates/cycles.s

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Distributed under the MIT License.
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TEXT _cycles(SB),1,$0				/* time stamp counter; cycles since power up */
	RDTSC
	MOVL	AX, 0(RARG)			/* lo */
	MOVL	DX, 4(RARG)			/* hi */
	RET

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