--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.loop.phases/src/org/graalvm/compiler/loop/phases/LoopUnswitchingPhase.java	2017-02-15 17:06:06.531233025 -0800
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.compiler.loop.phases;
+
+import java.util.Iterator;
+import java.util.List;
+
+import org.graalvm.compiler.debug.Debug;
+import org.graalvm.compiler.debug.DebugCounter;
+import org.graalvm.compiler.graph.Node;
+import org.graalvm.compiler.loop.LoopEx;
+import org.graalvm.compiler.loop.LoopPolicies;
+import org.graalvm.compiler.loop.LoopsData;
+import org.graalvm.compiler.nodes.AbstractBeginNode;
+import org.graalvm.compiler.nodes.ControlSplitNode;
+import org.graalvm.compiler.nodes.StructuredGraph;
+
+public class LoopUnswitchingPhase extends ContextlessLoopPhase<LoopPolicies> {
+    private static final DebugCounter UNSWITCHED = Debug.counter("Unswitched");
+    private static final DebugCounter UNSWITCH_CANDIDATES = Debug.counter("UnswitchCandidates");
+    private static final DebugCounter UNSWITCH_EARLY_REJECTS = Debug.counter("UnswitchEarlyRejects");
+
+    public LoopUnswitchingPhase(LoopPolicies policies) {
+        super(policies);
+    }
+
+    @Override
+    protected void run(StructuredGraph graph) {
+        if (graph.hasLoops()) {
+            boolean unswitched;
+            do {
+                unswitched = false;
+                final LoopsData dataUnswitch = new LoopsData(graph);
+                for (LoopEx loop : dataUnswitch.outerFirst()) {
+                    if (getPolicies().shouldTryUnswitch(loop)) {
+                        List<ControlSplitNode> controlSplits = LoopTransformations.findUnswitchable(loop);
+                        if (controlSplits != null) {
+                            UNSWITCH_CANDIDATES.increment();
+                            if (getPolicies().shouldUnswitch(loop, controlSplits)) {
+                                if (Debug.isLogEnabled()) {
+                                    logUnswitch(loop, controlSplits);
+                                }
+                                LoopTransformations.unswitch(loop, controlSplits);
+                                Debug.dump(Debug.INFO_LOG_LEVEL, graph, "After unswitch %s", controlSplits);
+                                UNSWITCHED.increment();
+                                unswitched = true;
+                                break;
+                            }
+                        }
+                    } else {
+                        UNSWITCH_EARLY_REJECTS.increment();
+                    }
+                }
+            } while (unswitched);
+        }
+    }
+
+    private static void logUnswitch(LoopEx loop, List<ControlSplitNode> controlSplits) {
+        StringBuilder sb = new StringBuilder("Unswitching ");
+        sb.append(loop).append(" at ");
+        for (ControlSplitNode controlSplit : controlSplits) {
+            sb.append(controlSplit).append(" [");
+            Iterator<Node> it = controlSplit.successors().iterator();
+            while (it.hasNext()) {
+                sb.append(controlSplit.probability((AbstractBeginNode) it.next()));
+                if (it.hasNext()) {
+                    sb.append(", ");
+                }
+            }
+            sb.append("]");
+        }
+        Debug.log("%s", sb);
+    }
+
+    @Override
+    public float codeSizeIncrease() {
+        return 10.0f;
+    }
+}