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33 lines
359 B
ArmAsm
33 lines
359 B
ArmAsm
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; Ullrich von Bassewitz, 16.03.2002
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; CC65 runtime: Multiply the primary register
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;
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.export mulax7
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.importzp ptr1, tmp1
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.proc mulax7
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sta ptr1
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stx ptr1+1
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stx tmp1
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asl a
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rol tmp1 ; * 2
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asl a
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rol tmp1 ; * 4
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asl a
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rol tmp1 ; * 8
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sec
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sbc ptr1
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pha
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lda tmp1
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sbc ptr1+1 ; * (8 - 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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