mirror of
https://github.com/cc65/cc65.git
synced 2024-11-02 18:06:48 +00:00
89 lines
1.1 KiB
ArmAsm
89 lines
1.1 KiB
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 05.08.1998
|
||
|
|
;
|
||
|
|
; CC65 runtime: long conversion routines
|
||
|
|
;
|
||
|
|
|
||
|
|
;
|
||
|
|
; Convert TOS from long to int by cutting of the high 16bit
|
||
|
|
;
|
||
|
|
.export tosint, tosulong, toslong, axulong, axlong
|
||
|
|
.import incsp2, decsp2
|
||
|
|
.importzp sp, sreg
|
||
|
|
|
||
|
|
tosint: pha
|
||
|
|
ldy #0
|
||
|
|
lda (sp),y ; sp+1
|
||
|
|
ldy #2
|
||
|
|
sta (sp),y
|
||
|
|
ldy #1
|
||
|
|
lda (sp),y
|
||
|
|
ldy #3
|
||
|
|
sta (sp),y
|
||
|
|
pla
|
||
|
|
jmp incsp2 ; Drop 16 bit
|
||
|
|
|
||
|
|
;
|
||
|
|
; Convert TOS from int to long
|
||
|
|
;
|
||
|
|
|
||
|
|
tosulong:
|
||
|
|
pha
|
||
|
|
jsr decsp2 ; Make room
|
||
|
|
ldy #2
|
||
|
|
lda (sp),y
|
||
|
|
ldy #0
|
||
|
|
sta (sp),y
|
||
|
|
ldy #3
|
||
|
|
lda (sp),y
|
||
|
|
ldy #1
|
||
|
|
sta (sp),y
|
||
|
|
lda #0 ; Zero extend
|
||
|
|
toslong2:
|
||
|
|
iny
|
||
|
|
sta (sp),y
|
||
|
|
iny
|
||
|
|
sta (sp),y
|
||
|
|
pla
|
||
|
|
rts
|
||
|
|
|
||
|
|
toslong:
|
||
|
|
pha
|
||
|
|
jsr decsp2 ; Make room
|
||
|
|
ldy #2
|
||
|
|
lda (sp),y
|
||
|
|
ldy #0
|
||
|
|
sta (sp),y
|
||
|
|
ldy #3
|
||
|
|
lda (sp),y
|
||
|
|
bmi toslong1
|
||
|
|
ldy #1
|
||
|
|
sta (sp),y
|
||
|
|
lda #$00 ; Positive, high word is zero
|
||
|
|
bne toslong2
|
||
|
|
toslong1:
|
||
|
|
ldy #1
|
||
|
|
sta (sp),y
|
||
|
|
lda #$FF
|
||
|
|
bne toslong2
|
||
|
|
|
||
|
|
;
|
||
|
|
; Convert AX from int to long in EAX
|
||
|
|
;
|
||
|
|
|
||
|
|
axulong:
|
||
|
|
ldy #0
|
||
|
|
sty sreg
|
||
|
|
sty sreg+1
|
||
|
|
rts
|
||
|
|
|
||
|
|
axlong: cpx #$80 ; Positive?
|
||
|
|
bcc axulong ; Yes, handle like unsigned type
|
||
|
|
ldy #$ff
|
||
|
|
sty sreg
|
||
|
|
sty sreg+1
|
||
|
|
rts
|
||
|
|
|
||
|
|
|
||
|
|
|