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diff --git a/Source/JavaScriptCore/assembler/MacroAssemblerHelpers.h b/Source/JavaScriptCore/assembler/MacroAssemblerHelpers.h
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+++ b/Source/JavaScriptCore/assembler/MacroAssemblerHelpers.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
+
+namespace JSC {
+namespace MacroAssemblerHelpers {
+
+// True if this:
+//     branch8(cond, value, value)
+// Is the same as this:
+//     branch32(cond, signExt8(value), signExt8(value))
+template<typename MacroAssemblerType>
+inline bool isSigned(typename MacroAssemblerType::RelationalCondition cond)
+{
+    switch (cond) {
+    case MacroAssemblerType::Equal:
+    case MacroAssemblerType::NotEqual:
+    case MacroAssemblerType::GreaterThan:
+    case MacroAssemblerType::GreaterThanOrEqual:
+    case MacroAssemblerType::LessThan:
+    case MacroAssemblerType::LessThanOrEqual:
+        return true;
+    default:
+        return false;
+    }
+}
+
+// True if this:
+//     branch8(cond, value, value)
+// Is the same as this:
+//     branch32(cond, zeroExt8(value), zeroExt8(value))
+template<typename MacroAssemblerType>
+inline bool isUnsigned(typename MacroAssemblerType::RelationalCondition cond)
+{
+    switch (cond) {
+    case MacroAssemblerType::Equal:
+    case MacroAssemblerType::NotEqual:
+    case MacroAssemblerType::Above:
+    case MacroAssemblerType::AboveOrEqual:
+    case MacroAssemblerType::Below:
+    case MacroAssemblerType::BelowOrEqual:
+        return true;
+    default:
+        return false;
+    }
+}
+
+// True if this:
+//     test8(cond, value, value)
+// Is the same as this:
+//     test32(cond, signExt8(value), signExt8(value))
+template<typename MacroAssemblerType>
+inline bool isSigned(typename MacroAssemblerType::ResultCondition cond)
+{
+    switch (cond) {
+    case MacroAssemblerType::Signed:
+    case MacroAssemblerType::PositiveOrZero:
+    case MacroAssemblerType::Zero:
+    case MacroAssemblerType::NonZero:
+        return true;
+    default:
+        return false;
+    }
+}
+
+// True if this:
+//     test8(cond, value, value)
+// Is the same as this:
+//     test32(cond, zeroExt8(value), zeroExt8(value))
+template<typename MacroAssemblerType>
+inline bool isUnsigned(typename MacroAssemblerType::ResultCondition cond)
+{
+    switch (cond) {
+    case MacroAssemblerType::Zero:
+    case MacroAssemblerType::NonZero:
+        return true;
+    default:
+        return false;
+    }
+}
+
+template<typename MacroAssemblerType>
+inline typename MacroAssemblerType::TrustedImm32 mask8OnCondition(MacroAssemblerType&, typename MacroAssemblerType::RelationalCondition cond, typename MacroAssemblerType::TrustedImm32 value)
+{
+    if (isUnsigned<MacroAssemblerType>(cond))
+        return typename MacroAssemblerType::TrustedImm32(static_cast<uint8_t>(value.m_value));
+    return typename MacroAssemblerType::TrustedImm32(static_cast<int8_t>(value.m_value));
+}
+
+template<typename MacroAssemblerType>
+inline typename MacroAssemblerType::TrustedImm32 mask8OnCondition(MacroAssemblerType&, typename MacroAssemblerType::ResultCondition cond, typename MacroAssemblerType::TrustedImm32 value)
+{
+    if (isUnsigned<MacroAssemblerType>(cond))
+        return typename MacroAssemblerType::TrustedImm32(static_cast<uint8_t>(value.m_value));
+    ASSERT_WITH_MESSAGE(cond != MacroAssemblerType::Overflow, "Overflow is not used for 8bit test operations.");
+    ASSERT(isSigned<MacroAssemblerType>(cond));
+    return typename MacroAssemblerType::TrustedImm32(static_cast<int8_t>(value.m_value));
+}
+
+template<typename MacroAssemblerType, typename Condition, typename ...Args>
+void load8OnCondition(MacroAssemblerType& jit, Condition cond, Args... args)
+{
+    if (isUnsigned<MacroAssemblerType>(cond))
+        return jit.load8(std::forward<Args>(args)...);
+    return jit.load8SignedExtendTo32(std::forward<Args>(args)...);
+}
+
+} } // namespace JSC