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libsrc/runtime/lsubeqsp.s

@@ -0,0 +1,37 @@
+;
+; Ullrich von Bassewitz, 08.10.1998
+;
+; CC65 runtime: -= operator for longs on the stack
+;			    
+
+       	.export	       	lsubeq0sp, lsubeqysp
+	.importzp   	sp, sreg, tmp1, tmp2
+
+lsubeq0sp:
+      	ldy	#0
+lsubeqysp:
+    	sec
+	sta	tmp1
+	stx	tmp2
+       	lda	(sp),y
+	sbc	tmp1
+	sta	(sp),y
+	pha
+	iny
+       	lda	(sp),y
+	sbc	tmp2
+	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
+