File: mulax3.s

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;
; Ullrich von Bassewitz, 04.10.2001
;
; CC65 runtime: Multiply the primary register by 3
;
; Don't touch the Y-register here, the optimizer relies on it!

        .export         mulax3
        .importzp       ptr1
                
.proc   mulax3

        sta     ptr1
        stx     ptr1+1
        asl     a
        rol     ptr1+1
        clc
        adc     ptr1
        pha
        txa
        adc     ptr1+1
        tax
        pla
        rts

.endproc