84 lines
914 B
ArmAsm
84 lines
914 B
ArmAsm
.sect .text; .sect .rom; .sect .data; .sect .bss; .sect .text
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.sect .text
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.define dvi4~
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.extern save~,retu~
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! $Header$
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dvi4~:
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jsr pc,save~
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mov 02(sp),r3
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sxt r4
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bpl 1f
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neg r3
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1: cmp r4,(sp)
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bne hardldiv
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mov 06(sp),r2
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mov 04(sp),r1
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bge 2f
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neg r1
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neg r2
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sbc r1
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com r4
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2: mov r4,-(sp)
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clr r0
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div r3,r0
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mov r0,-(sp)
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mov r1,r0
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mov r1,r4
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mov r2,r1
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div r3,r0
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bvc 3f
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mov r2,r1
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mov r4,r0
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sub r3,r0
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div r3,r0
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tst r1
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sxt r1
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add r1,r0
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3: mov r0,r1
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mov (sp)+,r0
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br 4f
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hardldiv:
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clr -(sp)
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mov 010(sp),r2
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mov 06(sp),r1
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bpl 5f
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com (sp)
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neg r1
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neg r2
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sbc r1
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5: clr r0
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mov 02(sp),r3
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bge 6f
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neg r3
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neg 04(sp)
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sbc r3
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com (sp)
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6: mov $16,r4
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9: clc
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rol r2
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rol r1
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rol r0
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cmp r3,r0
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bhi 7f
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bcs 8f
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cmp 04(sp),r1
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blos 8f
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7: sob r4,9b
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br 1f
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8: sub 04(sp),r1
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sbc r0
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sub r3,r0
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inc r2
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sob r4,9b
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1:
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mov r2,r1
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clr r0
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4: tst (sp)+
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beq 1f
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neg r0
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neg r1
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sbc r0
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1: add $010,sp
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jmp retu~
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