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diff --git a/Source/JavaScriptCore/b3/B3LegalizeMemoryOffsets.cpp b/Source/JavaScriptCore/b3/B3LegalizeMemoryOffsets.cpp
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+++ b/Source/JavaScriptCore/b3/B3LegalizeMemoryOffsets.cpp
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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.
+ */
+
+#include "config.h"
+#include "B3LegalizeMemoryOffsets.h"
+
+#if ENABLE(B3_JIT)
+
+#include "AirArg.h"
+#include "B3InsertionSetInlines.h"
+#include "B3MemoryValue.h"
+#include "B3PhaseScope.h"
+#include "B3ProcedureInlines.h"
+#include "B3ValueInlines.h"
+
+namespace JSC { namespace B3 {
+
+namespace {
+
+class LegalizeMemoryOffsets {
+public:
+    LegalizeMemoryOffsets(Procedure& proc)
+        : m_proc(proc)
+        , m_insertionSet(proc)
+    {
+    }
+
+    void run()
+    {
+        if (!isARM64())
+            return;
+
+        for (BasicBlock* block : m_proc) {
+            for (unsigned index = 0; index < block->size(); ++index) {
+                MemoryValue* memoryValue = block->at(index)->as<MemoryValue>();
+                if (!memoryValue)
+                    continue;
+
+                int32_t offset = memoryValue->offset();
+                Air::Arg::Width width = Air::Arg::widthForBytes(memoryValue->accessByteSize());
+                if (!Air::Arg::isValidAddrForm(offset, width)) {
+                    Value* base = memoryValue->lastChild();
+                    Value* offsetValue = m_insertionSet.insertIntConstant(index, memoryValue->origin(), pointerType(), offset);
+                    Value* resolvedAddress = m_proc.add<Value>(Add, memoryValue->origin(), base, offsetValue);
+                    m_insertionSet.insertValue(index, resolvedAddress);
+
+                    memoryValue->lastChild() = resolvedAddress;
+                    memoryValue->setOffset(0);
+                }
+            }
+            m_insertionSet.execute(block);
+        }
+    }
+
+    Procedure& m_proc;
+    InsertionSet m_insertionSet;
+};
+
+} // anonymous namespace
+
+void legalizeMemoryOffsets(Procedure& proc)
+{
+    PhaseScope phaseScope(proc, "legalizeMemoryOffsets");
+    LegalizeMemoryOffsets legalizeMemoryOffsets(proc);
+    legalizeMemoryOffsets.run();
+}
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)
+