30 lines
458 B
ArmAsm
30 lines
458 B
ArmAsm
.define .cmi
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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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! on entry d0: # bytes of 1 block
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! on exit d0: result
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.cmi:
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move.l (sp)+, d2 ! return address
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move.l sp, a0 ! address of top block
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lea 0(sp, d0.l), a1 ! address of lower block
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move.l d0, d1
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asr.l #2, d0
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1:
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cmp.l (a0)+, (a1)+
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bne 2f
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sub.l #1, d0
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bne 1b
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2:
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bge 3f
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neg.l d0 ! less
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3:
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asl.l #1, d1
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add.l d1, sp ! new sp; two blocks popped
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move.l d2, -(sp)
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rts
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.align 2
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