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libsrc/runtime/sub.s

@@ -0,0 +1,31 @@
+;
+; Ullrich von Bassewitz, 05.08.1998
+;
+; CC65 runtime: sub ints
+;
+
+       	.export		tossuba0, tossubax
+	.import		addysp1		
+	.importzp	sp, ptr1
+
+;
+; AX = TOS - AX
+;
+
+tossuba0:
+	ldx	#0
+tossubax:
+	ldy	#0
+	sta	ptr1
+	stx	ptr1+1
+	lda	(sp),y		; lo byte
+	sec
+	sbc	ptr1
+	sta	ptr1		; save lo byte
+	iny
+	lda	(sp),y
+	sbc	ptr1+1
+	tax
+	lda	ptr1
+	jmp	addysp1		; drop TOS, set condition codes
+