# HG changeset patch
# User Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
# Date 1381786125 -7200
# Node ID 11e4744f1e864471f09cad198b9cffae045714cb
# Parent  139b84d713bc59c8b64071274b6369002c740788
Improve canonicalization of FixedGuardNode.

diff -r 139b84d713bc -r 11e4744f1e86 graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/FixedGuardNode.java
--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/FixedGuardNode.java	Mon Oct 14 23:28:10 2013 +0200
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/FixedGuardNode.java	Mon Oct 14 23:28:45 2013 +0200
@@ -82,7 +82,7 @@
 
     @Override
     public void simplify(SimplifierTool tool) {
-        if (condition instanceof LogicNegationNode) {
+        while (condition instanceof LogicNegationNode) {
             LogicNegationNode negation = (LogicNegationNode) condition;
             setCondition(negation.getInput());
             negated = !negated;
@@ -100,7 +100,7 @@
                 deopt.setDeoptimizationState(getDeoptimizationState());
                 setNext(deopt);
             }
-            this.replaceAtUsages(BeginNode.prevBegin(this));
+            this.replaceAtUsages(null);
             graph().removeFixed(this);
         }
     }