32 lines
509 B
ArmAsm
32 lines
509 B
ArmAsm
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.define Dvu4
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! This subroutine performs an unsigned division on fourbyte
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! integers. For more details see dvi.s
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! The only difference is that zeropage locations are twice as big.
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Dvu4:
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ldy #0
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sty UNSIGN ! it is unsigned
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jsr Pop
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stx ARTH
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sta ARTH+1
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jsr Pop
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stx ARTH+2
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sta ARTH+3 ! divisor in ARTH - ARTH+3
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jsr Pop
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stx ARTH+4
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sta ARTH+5
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jsr Pop
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stx ARTH+6
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sta ARTH+7 ! dividend in ARTH+4 - ARTH+7
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jsr Duv4
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lda ARTH+7
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ldx ARTH+6
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jsr Push
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lda ARTH+5
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ldx ARTH+4
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jmp Push ! store result
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