# HG changeset patch
# User Gilles Duboscq <duboscq@ssw.jku.at>
# Date 1397481419 -7200
# Node ID 76695509b2fd9b43b5468e97d0a8204a1d29a992
# Parent  c680646518475170b60fa52d790938804ece0261
Avoid precessing unused phis during peeling

diff -r c68064651847 -r 76695509b2fd graal/com.oracle.graal.loop/src/com/oracle/graal/loop/LoopFragmentInside.java
--- a/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/LoopFragmentInside.java	Mon Apr 14 15:13:17 2014 +0200
+++ b/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/LoopFragmentInside.java	Mon Apr 14 15:16:59 2014 +0200
@@ -184,6 +184,9 @@
         StructuredGraph graph = loopBegin.graph();
         List<PhiNode> newPhis = new LinkedList<>();
         for (PhiNode phi : loopBegin.phis().snapshot()) {
+            if (phi.usages().isEmpty()) {
+                continue;
+            }
             ValueNode first;
             if (loopBegin.loopEnds().count() == 1) {
                 ValueNode b = phi.valueAt(loopBegin.loopEnds().first()); // back edge value
@@ -284,6 +287,9 @@
             }
 
             for (final PhiNode phi : loopBegin.phis().snapshot()) {
+                if (phi.usages().isEmpty()) {
+                    continue;
+                }
                 final PhiNode firstPhi = patchPhi(graph, phi, newExitMerge);
                 for (AbstractEndNode end : newExitMerge.forwardEnds()) {
                     LoopEndNode loopEnd = reverseEnds.get(end);