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diff --git a/include/llvm/Operator.h b/include/llvm/Operator.h
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+//===-- llvm/Operator.h - Operator utility subclass -------------*- 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 various classes for working with Instructions and
+// ConstantExprs.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OPERATOR_H
+#define LLVM_OPERATOR_H
+
+#include "llvm/Instruction.h"
+#include "llvm/Constants.h"
+
+namespace llvm {
+
+/// Operator - This is a utility class that provides an abstraction for the
+/// common functionality between Instructions and ConstantExprs.
+///
+class Operator : public User {
+private:
+  // Do not implement any of these. The Operator class is intended to be used
+  // as a utility, and is never itself instantiated.
+  void *operator new(size_t, unsigned);
+  void *operator new(size_t s);
+  Operator();
+  ~Operator();
+
+public:
+  /// getOpcode - Return the opcode for this Instruction or ConstantExpr.
+  ///
+  unsigned getOpcode() const {
+    if (const Instruction *I = dyn_cast<Instruction>(this))
+      return I->getOpcode();
+    return cast<ConstantExpr>(this)->getOpcode();
+  }
+
+  /// getOpcode - If V is an Instruction or ConstantExpr, return its
+  /// opcode. Otherwise return UserOp1.
+  ///
+  static unsigned getOpcode(const Value *V) {
+    if (const Instruction *I = dyn_cast<Instruction>(V))
+      return I->getOpcode();
+    if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
+      return CE->getOpcode();
+    return Instruction::UserOp1;
+  }
+
+  static inline bool classof(const Operator *) { return true; }
+  static inline bool classof(const Instruction *I) { return true; }
+  static inline bool classof(const ConstantExpr *I) { return true; }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) || isa<ConstantExpr>(V);
+  }
+};
+
+/// OverflowingBinaryOperator - Utility class for integer arithmetic operators
+/// which may exhibit overflow - Add, Sub, and Mul.
+///
+class OverflowingBinaryOperator : public Operator {
+public:
+  /// hasNoSignedOverflow - Test whether this operation is known to never
+  /// undergo signed overflow.
+  bool hasNoSignedOverflow() const {
+    return SubclassOptionalData & (1 << 0);
+  }
+  void setHasNoSignedOverflow(bool B) {
+    SubclassOptionalData = (SubclassOptionalData & ~(1 << 0)) | (B << 0);
+  }
+
+  /// hasNoUnsignedOverflow - Test whether this operation is known to never
+  /// undergo unsigned overflow.
+  bool hasNoUnsignedOverflow() const {
+    return SubclassOptionalData & (1 << 1);
+  }
+  void setHasNoUnsignedOverflow(bool B) {
+    SubclassOptionalData = (SubclassOptionalData & ~(1 << 1)) | (B << 1);
+  }
+
+  static inline bool classof(const OverflowingBinaryOperator *) { return true; }
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::Add ||
+           I->getOpcode() == Instruction::Sub ||
+           I->getOpcode() == Instruction::Mul;
+  }
+  static inline bool classof(const ConstantExpr *CE) {
+    return CE->getOpcode() == Instruction::Add ||
+           CE->getOpcode() == Instruction::Sub ||
+           CE->getOpcode() == Instruction::Mul;
+  }
+  static inline bool classof(const Value *V) {
+    return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+           (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+  }
+};
+
+/// UDivOperator - An Operator with opcode Instruction::UDiv.
+///
+class UDivOperator : public Operator {
+public:
+  /// isExact - Test whether this division is known to be exact, with
+  /// zero remainder.
+  bool isExact() const {
+    return SubclassOptionalData & (1 << 0);
+  }
+  void setIsExact(bool B) {
+    SubclassOptionalData = (SubclassOptionalData & ~(1 << 0)) | (B << 0);
+  }
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const UDivOperator *) { return true; }
+  static inline bool classof(const ConstantExpr *CE) {
+    return CE->getOpcode() == Instruction::UDiv;
+  }
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::UDiv;
+  }
+  static inline bool classof(const Value *V) {
+    return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+           (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+  }
+};
+
+} // End llvm namespace
+
+#endif