60 lines
572 B
ArmAsm
60 lines
572 B
ArmAsm
.define .cmu4
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! 4 byte cmu and cmi routine
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! parameters:
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! a: 0 for cmu, 1 for cmi
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! stack: operands
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! de: result (out)
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.cmu4:
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pop ix
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ld de,4
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ld b,d
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ld c,e
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ld hl,0
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add hl,sp
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add hl,bc
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dec hl
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ld d,h
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ld e,l
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add hl,bc
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ld (savesp),hl ! save new sp-1
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or a
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jr z,1f
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ld a,(de)
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cp (hl)
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dec hl
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dec de
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dec bc
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jr z,1f
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jp p,4f
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jr 6f
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1:
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ld a,(de)
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cp (hl)
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dec de
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dec hl
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dec bc
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jr nz,2f
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ld a,b
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or c
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jr nz,1b
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ld d,a
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ld e,a
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jr 3f
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2:
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jr nc,4f
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6:
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ld de,1
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jr 3f
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4:
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ld de,-1
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3:
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ld hl,(savesp)
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inc hl
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ld sp,hl
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jp (ix)
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.data
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savesp: .word 0
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