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22 lines
546 B
ArmAsm
22 lines
546 B
ArmAsm
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; Ullrich von Bassewitz, 25.10.2000
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; CC65 runtime: Increment the stackpointer by value in y
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.export addysp1, addysp
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.importzp sp
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addysp1:
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iny
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addysp: pha ; Save A
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clc
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tya ; Get the value
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adc sp ; Add low byte
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sta sp ; Put it back
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bcc @L1 ; If no carry, we're done
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inc sp+1 ; Inc high byte
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@L1: pla ; Restore A
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rts
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