48 lines
472 B
ArmAsm
48 lines
472 B
ArmAsm
.define .dvu2
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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! 16-bit divide
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! parameters:
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! bc: divisor
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! de: dividend
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! de: quotient (out)
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! hl: remainder (out)
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! no overflow detection
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.dvu2:
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or a
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ld h,d
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ld l,e
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sbc hl,bc
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jp m,3f
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jp c,3f ! bc > de?
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ld hl,0
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ld a,16
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0:
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add hl,hl
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ex de,hl
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add hl,hl
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ex de,hl
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jr nc,1f
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inc hl
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or a
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1:
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sbc hl,bc
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inc de
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jp p,2f
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add hl,bc
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dec de
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2:
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dec a
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jr nz,0b
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ret
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3:
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ld hl,0
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ex de,hl
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ret
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