ac0 = %0
	ac1 = %1
	ac2 = %2
	ac3 = %3
	ac4 = %4

	cfcc

	ldf	ac3, ac0
	ldf	(r0)+, ac3

	stf	ac2, -(r5)
	stf	ac1, ac4

	ldcif	(r3), ac1

	stcfi	ac2, -(sp)
	clrf	ac3
	negf	(r4)+
	tstf	r0

	.end