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

       	.export	       	lsubeq0sp, lsubeqysp
	.importzp      	sp, sreg

lsubeq0sp:
      	ldy	#0
lsubeqysp:
    	sec
	eor	#$FF
       	adc	(sp),y
	sta	(sp),y
	pha	      		; Save low byte
	iny
	txa
	eor	#$FF
       	adc	(sp),y
	sta	(sp),y
	tax
	iny
       	lda	(sp),y
	sbc	sreg
	sta	(sp),y
	sta	sreg
	iny
       	lda	(sp),y
	sbc	sreg+1
	sta	(sp),y
	sta	sreg+1
	pla
	rts

