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diff --git a/Source/JavaScriptCore/b3/B3Common.h b/Source/JavaScriptCore/b3/B3Common.h
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+++ b/Source/JavaScriptCore/b3/B3Common.h
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+/*
+ * Copyright (C) 2015-2016 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 "JSExportMacros.h"
+#include <wtf/Optional.h>
+
+namespace JSC { namespace B3 {
+
+inline bool is64Bit() { return sizeof(void*) == 8; }
+inline bool is32Bit() { return !is64Bit(); }
+
+enum B3ComplitationMode {
+    B3Mode,
+    AirMode
+};
+
+JS_EXPORT_PRIVATE bool shouldDumpIR(B3ComplitationMode);
+bool shouldDumpIRAtEachPhase(B3ComplitationMode);
+bool shouldValidateIR();
+bool shouldValidateIRAtEachPhase();
+bool shouldSaveIRBeforePhase();
+bool shouldMeasurePhaseTiming();
+
+template<typename BitsType, typename InputType>
+inline bool isIdentical(InputType left, InputType right)
+{
+    BitsType leftBits = bitwise_cast<BitsType>(left);
+    BitsType rightBits = bitwise_cast<BitsType>(right);
+    return leftBits == rightBits;
+}
+
+inline bool isIdentical(int32_t left, int32_t right)
+{
+    return isIdentical<int32_t>(left, right);
+}
+
+inline bool isIdentical(int64_t left, int64_t right)
+{
+    return isIdentical<int64_t>(left, right);
+}
+
+inline bool isIdentical(double left, double right)
+{
+    return isIdentical<int64_t>(left, right);
+}
+
+inline bool isIdentical(float left, float right)
+{
+    return isIdentical<int32_t>(left, right);
+}
+
+template<typename ResultType, typename InputType, typename BitsType>
+inline bool isRepresentableAsImpl(InputType originalValue)
+{
+    // Convert the original value to the desired result type.
+    ResultType result = static_cast<ResultType>(originalValue);
+
+    // Convert the converted value back to the original type. The original value is representable
+    // using the new type if such round-tripping doesn't lose bits.
+    InputType newValue = static_cast<InputType>(result);
+
+    return isIdentical<BitsType>(originalValue, newValue);
+}
+
+template<typename ResultType>
+inline bool isRepresentableAs(int32_t value)
+{
+    return isRepresentableAsImpl<ResultType, int32_t, int32_t>(value);
+}
+
+template<typename ResultType>
+inline bool isRepresentableAs(int64_t value)
+{
+    return isRepresentableAsImpl<ResultType, int64_t, int64_t>(value);
+}
+
+template<typename ResultType>
+inline bool isRepresentableAs(double value)
+{
+    return isRepresentableAsImpl<ResultType, double, int64_t>(value);
+}
+
+template<typename IntType>
+static IntType chillDiv(IntType numerator, IntType denominator)
+{
+    if (!denominator)
+        return 0;
+    if (denominator == -1 && numerator == std::numeric_limits<IntType>::min())
+        return std::numeric_limits<IntType>::min();
+    return numerator / denominator;
+}
+
+template<typename IntType>
+static IntType chillMod(IntType numerator, IntType denominator)
+{
+    if (!denominator)
+        return 0;
+    if (denominator == -1 && numerator == std::numeric_limits<IntType>::min())
+        return 0;
+    return numerator % denominator;
+}
+
+template<typename IntType>
+static IntType chillUDiv(IntType numerator, IntType denominator)
+{
+    typedef typename std::make_unsigned<IntType>::type UnsignedIntType;
+    UnsignedIntType unsignedNumerator = static_cast<UnsignedIntType>(numerator);
+    UnsignedIntType unsignedDenominator = static_cast<UnsignedIntType>(denominator);
+    if (!unsignedDenominator)
+        return 0;
+    return unsignedNumerator / unsignedDenominator;
+}
+
+template<typename IntType>
+static IntType chillUMod(IntType numerator, IntType denominator)
+{
+    typedef typename std::make_unsigned<IntType>::type UnsignedIntType;
+    UnsignedIntType unsignedNumerator = static_cast<UnsignedIntType>(numerator);
+    UnsignedIntType unsignedDenominator = static_cast<UnsignedIntType>(denominator);
+    if (!unsignedDenominator)
+        return 0;
+    return unsignedNumerator % unsignedDenominator;
+}
+
+template<typename IntType>
+static IntType rotateRight(IntType value, int32_t shift)
+{
+    typedef typename std::make_unsigned<IntType>::type UnsignedIntType;
+    UnsignedIntType uValue = static_cast<UnsignedIntType>(value);
+    int32_t bits = sizeof(IntType) * 8;
+    int32_t mask = bits - 1;
+    shift &= mask;
+    return (uValue >> shift) | (uValue << ((bits - shift) & mask));
+}
+
+template<typename IntType>
+static IntType rotateLeft(IntType value, int32_t shift)
+{
+    typedef typename std::make_unsigned<IntType>::type UnsignedIntType;
+    UnsignedIntType uValue = static_cast<UnsignedIntType>(value);
+    int32_t bits = sizeof(IntType) * 8;
+    int32_t mask = bits - 1;
+    shift &= mask;
+    return (uValue << shift) | (uValue >> ((bits - shift) & mask));
+}
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)