shithub: riscv

ref: 50a98145e6c07f4e3ec588eb040334f531b5fe7c
dir: /sys/src/libc/386/cycles.s/

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#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