mirror of
https://github.com/cc65/cc65.git
synced 2024-12-23 19:29:37 +00:00
33 lines
378 B
ArmAsm
33 lines
378 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 16.03.2002
|
|
;
|
|
; CC65 runtime: Multiply the primary register
|
|
;
|
|
|
|
.export mulax9
|
|
.importzp ptr1, tmp1
|
|
|
|
.proc mulax9
|
|
|
|
sta ptr1
|
|
stx ptr1+1
|
|
stx tmp1
|
|
asl a
|
|
rol tmp1 ; * 2
|
|
asl a
|
|
rol tmp1 ; * 4
|
|
asl a
|
|
rol tmp1 ; * 8
|
|
clc
|
|
adc ptr1 ; * (8+1)
|
|
pha
|
|
lda tmp1
|
|
adc ptr1+1
|
|
tax
|
|
pla
|
|
rts
|
|
|
|
.endproc
|
|
|
|
|