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cc65/libsrc/runtime/mulax5.s

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;
; Ullrich von Bassewitz, 04.10.2001
;
; CC65 runtime: Multiply the primary register
;
.export mulax5
.importzp ptr1
.proc mulax5
sta ptr1
stx ptr1+1
asl a
rol ptr1+1
asl a
rol ptr1+1
clc
adc ptr1
pha
txa
adc ptr1+1
tax
pla
rts
.endproc