From 703f88dbb2e1e4352a0725b7e742151739b82ea1 Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Fri, 13 Sep 2024 09:23:19 -0700
Subject: x-x==0

Move x-x==0 to compute.
Add x/1 ==> x
All chapters
---
 chapter04/src/main/java/com/seaofnodes/simple/node/DivNode.java | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'chapter04/src')

diff --git a/chapter04/src/main/java/com/seaofnodes/simple/node/DivNode.java b/chapter04/src/main/java/com/seaofnodes/simple/node/DivNode.java
index 1404c900..3b3a4436 100644
--- a/chapter04/src/main/java/com/seaofnodes/simple/node/DivNode.java
+++ b/chapter04/src/main/java/com/seaofnodes/simple/node/DivNode.java
@@ -31,5 +31,10 @@ public class DivNode extends Node {
     }
 
     @Override
-    public Node idealize() { return null; }
+    public Node idealize() {
+        // Div of 1.
+        if( in(2)._type.isConstant() && in(2)._type instanceof TypeInteger i && i.value()==1 )
+            return in(1);
+        return null;
+    }
 }
-- 
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