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diff --git a/include/llvm/CodeGen/MachineMemOperand.h b/include/llvm/CodeGen/MachineMemOperand.h
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+++ b/include/llvm/CodeGen/MachineMemOperand.h
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+//==- llvm/CodeGen/MachineMemOperand.h - MachineMemOperand class -*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of the MachineMemOperand class, which is a
+// description of a memory reference. It is used to help track dependencies
+// in the backend.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_MACHINEMEMOPERAND_H
+#define LLVM_CODEGEN_MACHINEMEMOPERAND_H
+
+namespace llvm {
+
+class Value;
+class FoldingSetNodeID;
+
+//===----------------------------------------------------------------------===//
+/// MachineMemOperand - A description of a memory reference used in the backend.
+/// Instead of holding a StoreInst or LoadInst, this class holds the address
+/// Value of the reference along with a byte size and offset. This allows it
+/// to describe lowered loads and stores. Also, the special PseudoSourceValue
+/// objects can be used to represent loads and stores to memory locations
+/// that aren't explicit in the regular LLVM IR.
+///
+class MachineMemOperand {
+  int64_t Offset;
+  uint64_t Size;
+  const Value *V;
+  unsigned int Flags;
+
+public:
+  /// Flags values. These may be or'd together.
+  enum MemOperandFlags {
+    /// The memory access reads data.
+    MOLoad = 1,
+    /// The memory access writes data.
+    MOStore = 2,
+    /// The memory access is volatile.
+    MOVolatile = 4
+  };
+
+  /// MachineMemOperand - Construct an MachineMemOperand object with the
+  /// specified address Value, flags, offset, size, and alignment.
+  MachineMemOperand(const Value *v, unsigned int f, int64_t o, uint64_t s,
+                    unsigned int a);
+
+  /// getValue - Return the base address of the memory access.
+  /// Special values are PseudoSourceValue::FPRel, PseudoSourceValue::SPRel,
+  /// and the other PseudoSourceValue members which indicate references to
+  /// frame/stack pointer relative references and other special references.
+  const Value *getValue() const { return V; }
+
+  /// getFlags - Return the raw flags of the source value, \see MemOperandFlags.
+  unsigned int getFlags() const { return Flags & 7; }
+
+  /// getOffset - For normal values, this is a byte offset added to the base
+  /// address. For PseudoSourceValue::FPRel values, this is the FrameIndex
+  /// number.
+  int64_t getOffset() const { return Offset; }
+
+  /// getSize - Return the size in bytes of the memory reference.
+  uint64_t getSize() const { return Size; }
+
+  /// getAlignment - Return the minimum known alignment in bytes of the
+  /// memory reference.
+  unsigned int getAlignment() const { return (1u << (Flags >> 3)) >> 1; }
+
+  bool isLoad() const { return Flags & MOLoad; }
+  bool isStore() const { return Flags & MOStore; }
+  bool isVolatile() const { return Flags & MOVolatile; }
+
+  /// Profile - Gather unique data for the object.
+  ///
+  void Profile(FoldingSetNodeID &ID) const;
+};
+
+} // End llvm namespace
+
+#endif