mirror of
https://github.com/cc65/cc65.git
synced 2024-09-01 14:29:31 +00:00
26 lines
431 B
ArmAsm
26 lines
431 B
ArmAsm
|
;
|
||
|
; Ullrich von Bassewitz, 06.08.1998
|
||
|
;
|
||
|
; CC65 runtime: Scale the 32 bit primary register by 4
|
||
|
;
|
||
|
|
||
|
.export asreax2
|
||
|
.importzp sreg, tmp1
|
||
|
|
||
|
asreax2:
|
||
|
stx tmp1
|
||
|
ldx sreg+1
|
||
|
cpx #$80 ; Get bit 7 into carry
|
||
|
ror sreg+1
|
||
|
ror sreg
|
||
|
ror tmp1
|
||
|
ror a
|
||
|
cpx #$80 ; Get bit 7 into carry
|
||
|
ror sreg+1
|
||
|
ror sreg
|
||
|
ror tmp1
|
||
|
ror a
|
||
|
ldx tmp1
|
||
|
rts
|
||
|
|