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libsrc/runtime/lcmp.s

@@ -0,0 +1,50 @@
+;
+; Ullrich von Bassewitz, 10.12.1998
+;
+; Long int compare function - used by the compare operators
+;
+
+ 	.export		lcmp
+ 	.import		incsp4
+ 	.importzp	sp, sreg, ptr1
+
+
+lcmp:  	sta    	ptr1
+  	stx	ptr1+1 	  	; EAX now in sreg:ptr1
+
+  	ldy    	#$03
+       	lda    	(sp),y
+  	cmp	sreg+1
+  	bne	L4
+
+  	dey
+  	lda	(sp),y
+  	cmp	sreg
+  	bne	L1
+
+  	dey
+  	lda	(sp),y
+  	cmp	ptr1+1
+  	bne	L1
+
+  	dey
+  	lda	(sp),y
+  	cmp	ptr1
+
+L1:	php	      		; Save flags
+   	jsr	incsp4		; Drop TOS
+   	plp	  		; Restore the flags
+   	beq	L2
+   	bcs	L3
+   	lda	#$FF		; Set the N flag
+L2:  	rts
+
+L3:	lda	#$01		; Clear the N flag
+  	rts
+
+L4:	php	  		; Save flags
+	jsr	incsp4		; Drop TOS
+	plp	  		; Restore flags
+  	rts
+
+