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cc65/libsrc/runtime/aslax2.s
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ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; CC65 runtime: Scale the primary register by 4
;
.export aslax2, shlax2
.importzp tmp1
aslax2:
shlax2: stx tmp1
asl a
rol tmp1
asl a
rol tmp1
ldx tmp1
rts