ack/mach/m68k2/libem/dvi.s

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1984-12-14 15:41:14 +00:00
.define .dvi
! signed long divide
.text
.dvi:
move.l (sp)+,a0 ! return address
move.l (sp)+,d0
move.l (sp)+,d1
move.l d3,-(sp) ! save d3 and d4
move.l d4,-(sp)
clr.l d4
tst.l d0 ! divisor
bpl 1f
neg.l d0
not d4
1:
tst.l d1 ! dividend
bpl 2f
neg.l d1
not d4
swap d4
not d4
swap d4
2:
move.l d1,-(sp)
move.l d0,-(sp)
jsr .dvu
tst d4
beq 5f
neg.l d1 ! quotient
5:
tst.l d4
bpl 6f
neg.l d2 ! remainder
6:
move.l (sp)+,d4 ! restore d4 and d3
move.l (sp)+,d3
jmp (a0)