mirror of
https://github.com/cc65/cc65.git
synced 2024-12-27 15:29:46 +00:00
26 lines
529 B
ArmAsm
26 lines
529 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
|
|
|