git: 9front

ref: 1e8a9ebb0f76b0ebe8eb31d79c44324c1c1ed70f
dir: /sys/src/libthread/xincalpha.s/

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TEXT	_xdec(SB), $-8
	MOVQ	R0, R1		/* p */
dec1:
	MOVLL	(R1), R0		/* *p */
	SUBL		$1, R0
	MOVQ	R0, R2
	MOVLC	R2, (R1)		/* --(*p) */
	BEQ		R2, dec1		/* write failed, retry */
	RET

TEXT	_xinc(SB), $-8
	MOVQ	R0, R1		/* p */
inc1:
	MOVLL	(R1), R0		/* *p */
	ADDL	$1, R0
	MOVLC	R0, (R1)		/* (*p)++ */
	BEQ		R0, inc1		/* write failed, retry */
	RET