From 4be43794169610d45e47468702c63cdfbc5deb5a Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Fri, 13 Sep 2024 09:40:38 -0700
Subject: move x-x check up front

---
 chapter08/src/main/java/com/seaofnodes/simple/node/SubNode.java | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'chapter08/src/main/java/com')

diff --git a/chapter08/src/main/java/com/seaofnodes/simple/node/SubNode.java b/chapter08/src/main/java/com/seaofnodes/simple/node/SubNode.java
index 98aa679f..af66b950 100644
--- a/chapter08/src/main/java/com/seaofnodes/simple/node/SubNode.java
+++ b/chapter08/src/main/java/com/seaofnodes/simple/node/SubNode.java
@@ -21,15 +21,16 @@ public class SubNode extends Node {
 
     @Override
     public Type compute() {
+        // Sub of same is 0
+        if( in(1)==in(2) )
+            return TypeInteger.ZERO;
+
         if (in(1)._type instanceof TypeInteger i0 &&
             in(2)._type instanceof TypeInteger i1) {
             if (i0.isConstant() && i1.isConstant())
                 return TypeInteger.constant(i0.value()-i1.value());
             return i0.meet(i1);
         }
-        // Sub of same is 0
-        if( in(1)==in(2) )
-            return TypeInteger.ZERO;
         return Type.BOTTOM;
     }
 
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