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diff --git a/Source/JavaScriptCore/b3/B3PureCSE.h b/Source/JavaScriptCore/b3/B3PureCSE.h
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+++ b/Source/JavaScriptCore/b3/B3PureCSE.h
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+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#pragma once
+
+#if ENABLE(B3_JIT)
+
+#include "B3ValueKey.h"
+#include <wtf/HashMap.h>
+#include <wtf/Vector.h>
+
+namespace JSC { namespace B3 {
+
+class BasicBlock;
+class Dominators;
+class Value;
+
+typedef Vector<Value*, 1> Matches;
+
+// This is a reusable utility for doing pure CSE. You can use it to do pure CSE on a program by just
+// proceeding in order an calling process().
+class PureCSE {
+public:
+    PureCSE();
+    ~PureCSE();
+
+    void clear();
+
+    Value* findMatch(const ValueKey&, BasicBlock*, Dominators&);
+
+    bool process(Value*, Dominators&);
+    
+private:
+    HashMap<ValueKey, Matches> m_map;
+};
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)