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29 lines
463 B
ArmAsm
29 lines
463 B
ArmAsm
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; Ullrich von Bassewitz, 04.10.2001
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; CC65 runtime: Multiply the primary register by 3
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; Don't touch the Y-register here, the optimizer relies on it!
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.export mulax3
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.importzp ptr1
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.proc mulax3
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sta ptr1
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stx ptr1+1
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asl a
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rol ptr1+1
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clc
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adc ptr1
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pha
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txa
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adc ptr1+1
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tax
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pla
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rts
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.endproc
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