31 lines
468 B
ArmAsm
31 lines
468 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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! This subroutine compares on two integers.
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! If T is pushed first and than S, the routine will return:
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! -1 if S < T,
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! 0 if S = T,
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! 1 if S > T.
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Cmi:
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jsr Sbi2 ! subtract operands (T - S)
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bpl 1f ! S >= T
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lda #0FFh ! S < T
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tax ! AX becomes -1
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rts
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1: beq 2f
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3: lda #0 ! S > T
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ldx #1 ! AX becomes 1
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rts
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2: txa
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bne 3b
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lda #0 ! S = T
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tax ! AX becomes 0
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rts
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