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diff --git a/lib/VMCore/ConstantFold.h b/lib/VMCore/ConstantFold.h
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+++ b/lib/VMCore/ConstantFold.h
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+//===-- ConstantFolding.h - Internal Constant Folding Interface -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the (internal) constant folding interfaces for LLVM.  These
+// interfaces are used by the ConstantExpr::get* methods to automatically fold
+// constants when possible.
+//
+// These operators may return a null object if they don't know how to perform
+// the specified operation on the specified constant types.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CONSTANTFOLDING_H
+#define CONSTANTFOLDING_H
+
+namespace llvm {
+  class Value;
+  class Constant;
+  class Type;
+
+  // Constant fold various types of instruction...
+  Constant *ConstantFoldCastInstruction(
+    unsigned opcode,     ///< The opcode of the cast
+    const Constant *V,   ///< The source constant
+    const Type *DestTy   ///< The destination type
+  );
+  Constant *ConstantFoldSelectInstruction(const Constant *Cond,
+                                          const Constant *V1,
+                                          const Constant *V2);
+  Constant *ConstantFoldExtractElementInstruction(const Constant *Val,
+                                                  const Constant *Idx);
+  Constant *ConstantFoldInsertElementInstruction(const Constant *Val,
+                                                 const Constant *Elt,
+                                                 const Constant *Idx);
+  Constant *ConstantFoldShuffleVectorInstruction(const Constant *V1,
+                                                 const Constant *V2,
+                                                 const Constant *Mask);
+  Constant *ConstantFoldExtractValueInstruction(const Constant *Agg,
+                                                const unsigned *Idxs,
+                                                unsigned NumIdx);
+  Constant *ConstantFoldInsertValueInstruction(const Constant *Agg,
+                                               const Constant *Val,
+                                               const unsigned* Idxs,
+                                               unsigned NumIdx);
+  Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
+                                          const Constant *V2);
+  Constant *ConstantFoldCompareInstruction(unsigned short predicate, 
+                                           const Constant *C1, 
+                                           const Constant *C2);
+  Constant *ConstantFoldGetElementPtr(const Constant *C,
+                                      Constant* const *Idxs, unsigned NumIdx);
+} // End llvm namespace
+
+#endif