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diff --git a/Source/JavaScriptCore/runtime/MathCommon.h b/Source/JavaScriptCore/runtime/MathCommon.h
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+++ b/Source/JavaScriptCore/runtime/MathCommon.h
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+/*
+ * Copyright (C) 2015 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.
+ */
+
+#ifndef MathCommon_h
+#define MathCommon_h
+
+#include "JITOperations.h"
+
+#ifndef JIT_OPERATION
+#define JIT_OPERATION
+#endif
+
+namespace JSC {
+double JIT_OPERATION operationMathPow(double x, double y) WTF_INTERNAL;
+
+inline int clz32(uint32_t number)
+{
+#if COMPILER(GCC_OR_CLANG)
+    int zeroCount = 32;
+    if (number)
+        zeroCount = __builtin_clz(number);
+    return zeroCount;
+#else
+    int zeroCount = 0;
+    for (int i = 31; i >= 0; i--) {
+        if (!(number >> i))
+            zeroCount++;
+        else
+            break;
+    }
+    return zeroCount;
+#endif
+}
+
+extern "C" {
+double JIT_OPERATION jsRound(double value) REFERENCED_FROM_ASM WTF_INTERNAL;
+}
+
+}
+
+#endif // MathCommon_h