mirror of
https://github.com/cc65/cc65.git
synced 2024-11-10 10:04:50 +00:00
24 lines
362 B
ArmAsm
24 lines
362 B
ArmAsm
|
;
|
||
|
|
; 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
|
||
|
|
|