add.s

;
; Ullrich von Bassewitz, 05.08.1998
;
; CC65 runtime: add ints
;

; Make this as fast as possible, even if it needs more space since it's
; called a lot!

       	.export		tosadda0, tosaddax
	.importzp	sp

tosadda0:
	ldx	#0
tosaddax:
      	clc
.ifpc02
     	adc	(sp)		; 65C02 version - saves 2 cycles
	ldy	#1
.else
      	ldy	#0
      	adc	(sp),y		; lo byte
      	iny
.endif
       	pha			; save it
      	txa
      	adc	(sp),y		; hi byte
	tax
	clc
	lda	sp
	adc	#2
	sta	sp
	bcc	L1
	inc	sp+1
L1:    	pla			; Restore low byte
	rts

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