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diff --git a/Source/JavaScriptCore/jit/JITAddGenerator.cpp b/Source/JavaScriptCore/jit/JITAddGenerator.cpp
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+++ b/Source/JavaScriptCore/jit/JITAddGenerator.cpp
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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.
+ */
+
+#include "config.h"
+#include "JITAddGenerator.h"
+
+#include "ArithProfile.h"
+#include "JITMathIC.h"
+#include "LinkBuffer.h"
+
+#if ENABLE(JIT)
+
+namespace JSC {
+
+JITMathICInlineResult JITAddGenerator::generateInline(CCallHelpers& jit, MathICGenerationState& state, const ArithProfile* arithProfile)
+{
+    // We default to speculating int32.
+    ObservedType lhs = ObservedType().withInt32();
+    ObservedType rhs = ObservedType().withInt32();
+    if (arithProfile) {
+        lhs = arithProfile->lhsObservedType();
+        rhs = arithProfile->rhsObservedType();
+    }
+
+    if (lhs.isOnlyNonNumber() && rhs.isOnlyNonNumber())
+        return JITMathICInlineResult::DontGenerate;
+
+    if ((lhs.isOnlyInt32() || m_leftOperand.isConstInt32()) && (rhs.isOnlyInt32() || m_rightOperand.isConstInt32())) {
+        ASSERT(!m_leftOperand.isConstInt32() || !m_rightOperand.isConstInt32());
+        if (!m_leftOperand.isConstInt32())
+            state.slowPathJumps.append(jit.branchIfNotInt32(m_left));
+        if (!m_rightOperand.isConstInt32())
+            state.slowPathJumps.append(jit.branchIfNotInt32(m_right));
+
+        GPRReg scratch = m_scratchGPR;
+        if (m_leftOperand.isConstInt32() || m_rightOperand.isConstInt32()) {
+            JSValueRegs var = m_leftOperand.isConstInt32() ? m_right : m_left;
+            int32_t constValue = m_leftOperand.isConstInt32() ? m_leftOperand.asConstInt32() : m_rightOperand.asConstInt32();
+            if (var.payloadGPR() != m_result.payloadGPR())
+                scratch = m_result.payloadGPR();
+            state.slowPathJumps.append(jit.branchAdd32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constValue), scratch));
+        } else {
+            if (m_left.payloadGPR() != m_result.payloadGPR() && m_right.payloadGPR() != m_result.payloadGPR())
+                scratch = m_result.payloadGPR();
+            state.slowPathJumps.append(jit.branchAdd32(CCallHelpers::Overflow, m_right.payloadGPR(), m_left.payloadGPR(), scratch));
+        }
+        jit.boxInt32(scratch, m_result);
+        return JITMathICInlineResult::GeneratedFastPath;
+    }
+
+    return JITMathICInlineResult::GenerateFullSnippet;
+}
+
+bool JITAddGenerator::generateFastPath(CCallHelpers& jit, CCallHelpers::JumpList& endJumpList, CCallHelpers::JumpList& slowPathJumpList, const ArithProfile* arithProfile, bool shouldEmitProfiling)
+{
+    ASSERT(m_scratchGPR != InvalidGPRReg);
+    ASSERT(m_scratchGPR != m_left.payloadGPR());
+    ASSERT(m_scratchGPR != m_right.payloadGPR());
+#if USE(JSVALUE32_64)
+    ASSERT(m_scratchGPR != m_left.tagGPR());
+    ASSERT(m_scratchGPR != m_right.tagGPR());
+    ASSERT(m_scratchFPR != InvalidFPRReg);
+#endif
+
+    ASSERT(!m_leftOperand.isConstInt32() || !m_rightOperand.isConstInt32());
+    
+    if (!m_leftOperand.mightBeNumber() || !m_rightOperand.mightBeNumber())
+        return false;
+
+    if (m_leftOperand.isConstInt32() || m_rightOperand.isConstInt32()) {
+        JSValueRegs var = m_leftOperand.isConstInt32() ? m_right : m_left;
+        SnippetOperand& varOpr = m_leftOperand.isConstInt32() ? m_rightOperand : m_leftOperand;
+        SnippetOperand& constOpr = m_leftOperand.isConstInt32() ? m_leftOperand : m_rightOperand;
+
+        // Try to do intVar + intConstant.
+        CCallHelpers::Jump notInt32 = jit.branchIfNotInt32(var);
+
+        GPRReg scratch = m_scratchGPR;
+        if (var.payloadGPR() != m_result.payloadGPR())
+            scratch = m_result.payloadGPR();
+        slowPathJumpList.append(jit.branchAdd32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constOpr.asConstInt32()), scratch));
+
+        jit.boxInt32(scratch, m_result);
+        endJumpList.append(jit.jump());
+
+        if (!jit.supportsFloatingPoint()) {
+            slowPathJumpList.append(notInt32);
+            return true;
+        }
+
+        // Try to do doubleVar + double(intConstant).
+        notInt32.link(&jit);
+        if (!varOpr.definitelyIsNumber())
+            slowPathJumpList.append(jit.branchIfNotNumber(var, m_scratchGPR));
+
+        jit.unboxDoubleNonDestructive(var, m_leftFPR, m_scratchGPR, m_scratchFPR);
+
+        jit.move(CCallHelpers::Imm32(constOpr.asConstInt32()), m_scratchGPR);
+        jit.convertInt32ToDouble(m_scratchGPR, m_rightFPR);
+
+        // Fall thru to doubleVar + doubleVar.
+
+    } else {
+        ASSERT(!m_leftOperand.isConstInt32() && !m_rightOperand.isConstInt32());
+        CCallHelpers::Jump leftNotInt;
+        CCallHelpers::Jump rightNotInt;
+
+        // Try to do intVar + intVar.
+        leftNotInt = jit.branchIfNotInt32(m_left);
+        rightNotInt = jit.branchIfNotInt32(m_right);
+
+        GPRReg scratch = m_scratchGPR;
+        if (m_left.payloadGPR() != m_result.payloadGPR() && m_right.payloadGPR() != m_result.payloadGPR())
+            scratch = m_result.payloadGPR();
+        slowPathJumpList.append(jit.branchAdd32(CCallHelpers::Overflow, m_right.payloadGPR(), m_left.payloadGPR(), scratch));
+
+        jit.boxInt32(scratch, m_result);
+        endJumpList.append(jit.jump());
+
+
+        if (!jit.supportsFloatingPoint()) {
+            slowPathJumpList.append(leftNotInt);
+            slowPathJumpList.append(rightNotInt);
+            return true;
+        }
+
+        leftNotInt.link(&jit);
+        if (!m_leftOperand.definitelyIsNumber())
+            slowPathJumpList.append(jit.branchIfNotNumber(m_left, m_scratchGPR));
+        if (!m_rightOperand.definitelyIsNumber())
+            slowPathJumpList.append(jit.branchIfNotNumber(m_right, m_scratchGPR));
+
+        jit.unboxDoubleNonDestructive(m_left, m_leftFPR, m_scratchGPR, m_scratchFPR);
+        CCallHelpers::Jump rightIsDouble = jit.branchIfNotInt32(m_right);
+
+        jit.convertInt32ToDouble(m_right.payloadGPR(), m_rightFPR);
+        CCallHelpers::Jump rightWasInteger = jit.jump();
+
+        rightNotInt.link(&jit);
+        if (!m_rightOperand.definitelyIsNumber())
+            slowPathJumpList.append(jit.branchIfNotNumber(m_right, m_scratchGPR));
+
+        jit.convertInt32ToDouble(m_left.payloadGPR(), m_leftFPR);
+
+        rightIsDouble.link(&jit);
+        jit.unboxDoubleNonDestructive(m_right, m_rightFPR, m_scratchGPR, m_scratchFPR);
+
+        rightWasInteger.link(&jit);
+
+        // Fall thru to doubleVar + doubleVar.
+    }
+
+    // Do doubleVar + doubleVar.
+    jit.addDouble(m_rightFPR, m_leftFPR);
+    if (arithProfile && shouldEmitProfiling)
+        arithProfile->emitSetDouble(jit);
+
+    jit.boxDouble(m_leftFPR, m_result);
+
+    return true;
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)