You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
;
|
|
; Ullrich von Bassewitz, 25.07.2001
|
|
;
|
|
; CC65 runtime: Scale the 32 bit primary register by 16
|
|
;
|
|
|
|
.export asreax4
|
|
.importzp sreg, tmp1
|
|
|
|
asreax4:
|
|
stx tmp1
|
|
ldx sreg+1
|
|
ldy #4
|
|
@L1: cpx #$80 ; Get bit 7 into carry
|
|
ror sreg+1
|
|
ror sreg
|
|
ror tmp1
|
|
ror a
|
|
dey
|
|
bne @L1
|
|
ldx tmp1
|
|
rts
|
|
|