git: 9front

ref: 147b367e710c4a6e02a7da17661b18a6cf2b3bad
dir: /sys/src/libthread/xincamd64.s/

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/*TEXT	xadd(SB),$0	/* long xadd(long *, long); */

/*	MOVL	i+8(FP),AX
/*	LOCK
/*	XADDL	AX, (RARG)
/*	RET
*/

TEXT	_xinc(SB),$0	/* void _xinc(long *); */

	LOCK; INCL	0(RARG)
	RET

TEXT	_xdec(SB),$0	/* long _xdec(long *); */

	MOVL	$0, AX
	MOVL	$1, BX
	LOCK; DECL	0(RARG)
	CMOVLNE	BX, AX
	RET