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diff --git a/Source/JavaScriptCore/b3/air/AirTmpInlines.h b/Source/JavaScriptCore/b3/air/AirTmpInlines.h
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+++ b/Source/JavaScriptCore/b3/air/AirTmpInlines.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. 
+ */
+
+#pragma once
+
+#if ENABLE(B3_JIT)
+
+#include "AirArg.h"
+#include "AirTmp.h"
+
+namespace JSC { namespace B3 { namespace Air {
+
+inline Tmp::Tmp(const Arg& arg)
+{
+    *this = arg.tmp();
+}
+
+// When a Hash structure is too slow or when Sets contains most values, you can
+// use direct array addressing with Tmps.
+template<Arg::Type type>
+struct AbsoluteTmpMapper;
+
+template<>
+struct AbsoluteTmpMapper<Arg::GP> {
+    static unsigned absoluteIndex(const Tmp& tmp)
+    {
+        ASSERT(tmp.isGP());
+        ASSERT(static_cast<int>(tmp.internalValue()) > 0);
+        return tmp.internalValue();
+    }
+
+    static unsigned absoluteIndex(unsigned tmpIndex)
+    {
+        return absoluteIndex(Tmp::gpTmpForIndex(tmpIndex));
+    }
+
+    static unsigned lastMachineRegisterIndex()
+    {
+        return absoluteIndex(Tmp(MacroAssembler::lastRegister()));
+    }
+
+    static Tmp tmpFromAbsoluteIndex(unsigned tmpIndex)
+    {
+        return Tmp::tmpForInternalValue(tmpIndex);
+    }
+};
+
+template<>
+struct AbsoluteTmpMapper<Arg::FP> {
+    static unsigned absoluteIndex(const Tmp& tmp)
+    {
+        ASSERT(tmp.isFP());
+        ASSERT(static_cast<int>(tmp.internalValue()) < 0);
+        return -tmp.internalValue();
+    }
+
+    static unsigned absoluteIndex(unsigned tmpIndex)
+    {
+        return absoluteIndex(Tmp::fpTmpForIndex(tmpIndex));
+    }
+
+    static unsigned lastMachineRegisterIndex()
+    {
+        return absoluteIndex(Tmp(MacroAssembler::lastFPRegister()));
+    }
+
+    static Tmp tmpFromAbsoluteIndex(unsigned tmpIndex)
+    {
+        return Tmp::tmpForInternalValue(-tmpIndex);
+    }
+};
+
+} } } // namespace JSC::B3::Air
+
+#endif // ENABLE(B3_JIT)