35 lines
472 B
ArmAsm
35 lines
472 B
ArmAsm
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.define .dvu
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! unsigned long divide
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! register usage:
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! : d0 divisor
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! d1 dividend
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! exit : d1 quotient
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! d2 remainder
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.text
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.dvu:
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move.l (sp)+,a1 ! 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
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tst.l d0
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bne 0f
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move.l (sp)+,d3
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move.w #EIDIVZ,-(sp)
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jsr .trp
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0:
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clr.l d2
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move.l #32,d3
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3:
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lsl.l #1,d1
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roxl.l #1,d2
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cmp.l d0,d2
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blt 4f
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sub.l d0,d2
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add #1,d1
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4:
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sub #1,d3
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bgt 3b
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move.l (sp)+,d3
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jmp (a1)
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