# HG changeset patch
# User Doug Simon <doug.simon@oracle.com>
# Date 1403688526 -7200
# Node ID 04c0c507d12317d3358e63bc18fb3a8816d52e32
# Parent  6140fd60abe959a61dcf534deb0a9d9f87d63584
prevent attempt to delete a node twice

diff -r 6140fd60abe9 -r 04c0c507d123 graal/com.oracle.graal.loop/src/com/oracle/graal/loop/DerivedScaledInductionVariable.java
--- a/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/DerivedScaledInductionVariable.java	Tue Jun 24 23:29:13 2014 +0200
+++ b/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/DerivedScaledInductionVariable.java	Wed Jun 25 11:28:46 2014 +0200
@@ -123,7 +123,7 @@
 
     @Override
     public void deleteUnusedNodes() {
-        if (scale.usages().isEmpty()) {
+        if (scale.isAlive() && scale.usages().isEmpty()) {
             GraphUtil.killWithUnusedFloatingInputs(scale);
         }
     }