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44 lines
721 B
ArmAsm
44 lines
721 B
ArmAsm
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; Ullrich von Bassewitz, 10.12.1998
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; Integer compare function - used by the compare operators
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;
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.export tosicmp
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.importzp sp, sreg
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tosicmp:
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sta sreg
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stx sreg+1 ; Save ax
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ldy #$01
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lda (sp),y ; Get high byte
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tax
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dey
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lda (sp),y ; Get low byte
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; Inline incsp2 for better performance
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inc sp ; 5
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bne @L1 ; 3
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inc sp+1 ; (5)
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@L1: inc sp ; 5
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bne @L2 ; 3
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inc sp+1 ; (5)
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; Do the compare.
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@L2: cpx sreg+1 ; Compare high byte
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bne @L3
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cmp sreg ; Compare low byte
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beq @L3
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bcs @L4
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lda #$FF ; Set the N flag
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@L3: rts
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@L4: lda #$01 ; Clear the N flag
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rts
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