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33 lines
308 B
ArmAsm
33 lines
308 B
ArmAsm
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; Ullrich von Bassewitz, 04.10.2001
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; CC65 runtime: Multiply the primary register
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;
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.export mulax10
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.importzp ptr1
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.proc mulax10
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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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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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sta ptr1+1
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pla
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asl a
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rol ptr1+1
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ldx ptr1+1
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rts
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.endproc
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