mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 06:31:31 +00:00
45 lines
738 B
ArmAsm
45 lines
738 B
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 10.12.1998
|
||
|
|
;
|
||
|
|
; Integer compare function - used by the compare operators
|
||
|
|
;
|
||
|
|
|
||
|
|
.export tosicmp
|
||
|
|
.import incsp2
|
||
|
|
.importzp sp, sreg
|
||
|
|
|
||
|
|
|
||
|
|
tosicmp:
|
||
|
|
sta sreg
|
||
|
|
stx sreg+1 ; Save ax
|
||
|
|
|
||
|
|
ldy #$01
|
||
|
|
lda (sp),y ; Get high byte
|
||
|
|
tax
|
||
|
|
dey
|
||
|
|
lda (sp),y ; Get low byte
|
||
|
|
|
||
|
|
; Inline incsp2 for better performance
|
||
|
|
|
||
|
|
inc sp ; 5
|
||
|
|
bne @L1 ; 3
|
||
|
|
inc sp+1 ; (5)
|
||
|
|
@L1: inc sp ; 5
|
||
|
|
bne @L2 ; 3
|
||
|
|
inc sp+1 ; (5)
|
||
|
|
|
||
|
|
; Do the compare.
|
||
|
|
|
||
|
|
@L2: cpx sreg+1 ; Compare high byte
|
||
|
|
bne @L3
|
||
|
|
cmp sreg ; Compare low byte
|
||
|
|
beq @L3
|
||
|
|
bcs @L4
|
||
|
|
lda #$FF ; Set the N flag
|
||
|
|
@L3: rts
|
||
|
|
|
||
|
|
@L4: lda #$01 ; Clear the N flag
|
||
|
|
rts
|
||
|
|
|
||
|
|
|