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cc65/libsrc/runtime/asleax1.s
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ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; CC65 runtime: Scale the 32 bit primary register by 2
;
.export asleax1, shleax1
.importzp sreg, tmp1
asleax1:
shleax1:
stx tmp1
asl a
rol tmp1
rol sreg
rol sreg+1
ldx tmp1
rts