# HG changeset patch
# User Doug Simon <doug.simon@oracle.com>
# Date 1403193095 -7200
# Node ID e34d8c5fa9279326261b063c6c90936307e25f3e
# Parent  7fb828b4c32ba49e6e37c9d1dd5f0e7ecf9068c7
do not create PiNode when lowering GuardingPiNode if the latter has no usages

diff -r 7fb828b4c32b -r e34d8c5fa927 graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/GuardingPiNode.java
--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/GuardingPiNode.java	Thu Jun 19 17:33:44 2014 +0200
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/GuardingPiNode.java	Thu Jun 19 17:51:35 2014 +0200
@@ -94,8 +94,10 @@
     public void lower(LoweringTool tool) {
         GuardingNode guard = tool.createGuard(next(), condition, reason, action, negated);
         ValueAnchorNode anchor = graph().add(new ValueAnchorNode((ValueNode) guard));
-        PiNode pi = graph().unique(new PiNode(object, stamp(), (ValueNode) guard));
-        replaceAtUsages(pi);
+        if (usages().isNotEmpty()) {
+            PiNode pi = graph().unique(new PiNode(object, stamp(), (ValueNode) guard));
+            replaceAtUsages(pi);
+        }
         graph().replaceFixedWithFixed(this, anchor);
     }