# HG changeset patch
# User Gilles Duboscq <duboscq@ssw.jku.at>
# Date 1367498247 -7200
# Node ID 05b8a812b4879a3c9ff1d91fad607081fdcecac4
# Parent  715f82d1f6952707f34e06c277677e0a6608ab29
Remove dead IsNull nodes in Guard lowering phase

diff -r 715f82d1f695 -r 05b8a812b487 graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/GuardLoweringPhase.java
--- a/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/GuardLoweringPhase.java	Thu May 02 14:35:48 2013 +0200
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/GuardLoweringPhase.java	Thu May 02 14:37:27 2013 +0200
@@ -193,6 +193,9 @@
             IsNullNode isNull = (IsNullNode) guard.condition();
             NullCheckNode nullCheck = guard.graph().add(new NullCheckNode(isNull.object()));
             replaceCurrent(nullCheck);
+            if (isNull.usages().isEmpty()) {
+                isNull.safeDelete();
+            }
         }
 
         private void insertLoopExits(DeoptimizeNode deopt) {