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git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/runtime/lsub.s

@@ -0,0 +1,36 @@
+;
+; Ullrich von Bassewitz, 05.08.1998
+;
+; CC65 runtime: long sub
+;
+
+;
+; EAX = TOS - EAX
+;
+	.export		tossubeax
+	.import		addysp1
+	.importzp	sp, sreg, tmp1, tmp2
+
+tossubeax:
+      	ldy	#0
+       	sec
+	sta	tmp1
+	lda	(sp),y
+	sbc	tmp1	      	; byte 0
+	sta	tmp2	      	; use as temp storage
+	iny
+	stx	tmp1
+	lda	(sp),y
+	sbc	tmp1	      	; byte 1
+	tax
+	iny
+	lda	(sp),y
+	sbc	sreg	      	; byte 2
+	sta	sreg
+	iny
+	lda	(sp),y
+	sbc	sreg+1	      	; byte 3
+	sta	sreg+1
+	lda	tmp2	      	; load byte 0
+       	jmp    	addysp1	      	; drop TOS
+