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