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libsrc/runtime/laddeqsp.s

@@ -0,0 +1,34 @@
+;
+; Ullrich von Bassewitz, 08.10.1998
+;
+; CC65 runtime: += operator for longs on the stack
+;
+
+       	.export		laddeq0sp, laddeqysp
+	.importzp	sp, sreg
+
+laddeq0sp:
+      	ldy	#0
+laddeqysp:
+	clc
+	adc	(sp),y
+	sta	(sp),y
+	pha
+	iny
+	txa
+	adc	(sp),y
+	sta	(sp),y
+	tax
+	iny
+	lda	sreg
+	adc	(sp),y
+	sta	(sp),y
+	sta	sreg
+	iny
+	lda	sreg+1
+	adc	(sp),y
+	sta	(sp),y
+	sta	sreg+1
+	pla
+	rts
+