.segment "LIBCODE"
;
; Ullrich von Bassewitz, 08.10.1998
;
; CC65 runtime: -= operator for ints on the stack
;

       	.export	       	subeq0sp, subeqysp
   	.importzp	sp

subeq0sp:
   	ldy	#0
subeqysp:
	sec
	eor	#$FF
	adc    	(sp),y
	sta	(sp),y
	pha	      		; Save low byte
	iny
	txa
	eor	#$FF
       	adc	(sp),y
	sta	(sp),y
	tax
	pla			; Restore low byte
	rts

