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23 lines
322 B
ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; CC65 runtime: Scale the 32 bit primary register by 4
;
.export shreax2
.importzp sreg, tmp1
shreax2:
stx tmp1
lsr sreg+1
ror sreg
ror tmp1
ror a
lsr sreg+1
ror sreg
ror tmp1
ror a
ldx tmp1
rts