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.
33 lines
349 B
ArmAsm
33 lines
349 B
ArmAsm
12 years ago
|
;
|
||
|
|
; Piotr Fusik, 24.10.2003
|
||
|
|
; originally by Ullrich von Bassewitz
|
||
|
|
;
|
||
|
|
; CC65 runtime: Multiply the primary register by 9
|
||
|
|
;
|
||
|
|
|
||
|
|
.export mulax9
|
||
|
|
.importzp ptr1
|
||
|
|
|
||
|
|
.proc mulax9
|
||
|
|
|
||
|
|
sta ptr1
|
||
|
|
stx ptr1+1
|
||
|
|
asl a
|
||
|
|
rol ptr1+1 ; * 2
|
||
|
|
asl a
|
||
|
|
rol ptr1+1 ; * 4
|
||
|
|
asl a
|
||
|
|
rol ptr1+1 ; * 8
|
||
|
|
clc
|
||
|
|
adc ptr1 ; * (8+1)
|
||
|
|
pha
|
||
|
|
txa
|
||
|
|
adc ptr1+1
|
||
|
|
tax
|
||
|
|
pla
|
||
|
|
rts
|
||
|
|
|
||
|
|
.endproc
|
||
|
|
|
||
|
|
|