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cc65/libsrc/runtime/shrax2.s
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ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; CC65 runtime: Scale the primary register by 4
;
.export shrax2
.importzp tmp1
shrax2: stx tmp1
lsr tmp1
ror a
lsr tmp1
ror a
ldx tmp1
rts