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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 {
+
+class GetElementPtrInst;
+class BinaryOperator;
+class ConstantExpr;
+
+/// 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. It does not include SDiv,
+/// despite that operator having the potential for overflow.
+///
+class OverflowingBinaryOperator : public Operator {
+public:
+  enum {
+    NoUnsignedWrap = (1 << 0),
+    NoSignedWrap   = (1 << 1)
+  };
+
+private:
+  ~OverflowingBinaryOperator(); // do not implement
+
+  friend class BinaryOperator;
+  friend class ConstantExpr;
+  void setHasNoUnsignedWrap(bool B) {
+    SubclassOptionalData =
+      (SubclassOptionalData & ~NoUnsignedWrap) | (B * NoUnsignedWrap);
+  }
+  void setHasNoSignedWrap(bool B) {
+    SubclassOptionalData =
+      (SubclassOptionalData & ~NoSignedWrap) | (B * NoSignedWrap);
+  }
+
+public:
+  /// hasNoUnsignedWrap - Test whether this operation is known to never
+  /// undergo unsigned overflow, aka the nuw property.
+  bool hasNoUnsignedWrap() const {
+    return SubclassOptionalData & NoUnsignedWrap;
+  }
+
+  /// hasNoSignedWrap - Test whether this operation is known to never
+  /// undergo signed overflow, aka the nsw property.
+  bool hasNoSignedWrap() const {
+    return SubclassOptionalData & NoSignedWrap;
+  }
+
+  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)));
+  }
+};
+
+/// AddOperator - Utility class for integer addition operators.
+///
+class AddOperator : public OverflowingBinaryOperator {
+  ~AddOperator(); // do not implement
+public:
+  static inline bool classof(const AddOperator *) { return true; }
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::Add;
+  }
+  static inline bool classof(const ConstantExpr *CE) {
+    return CE->getOpcode() == Instruction::Add;
+  }
+  static inline bool classof(const Value *V) {
+    return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+           (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+  }
+};
+
+/// SubOperator - Utility class for integer subtraction operators.
+///
+class SubOperator : public OverflowingBinaryOperator {
+  ~SubOperator(); // do not implement
+public:
+  static inline bool classof(const SubOperator *) { return true; }
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::Sub;
+  }
+  static inline bool classof(const ConstantExpr *CE) {
+    return CE->getOpcode() == Instruction::Sub;
+  }
+  static inline bool classof(const Value *V) {
+    return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+           (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+  }
+};
+
+/// MulOperator - Utility class for integer multiplication operators.
+///
+class MulOperator : public OverflowingBinaryOperator {
+  ~MulOperator(); // do not implement
+public:
+  static inline bool classof(const MulOperator *) { return true; }
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::Mul;
+  }
+  static inline bool classof(const ConstantExpr *CE) {
+    return 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)));
+  }
+};
+
+/// SDivOperator - An Operator with opcode Instruction::SDiv.
+///
+class SDivOperator : public Operator {
+public:
+  enum {
+    IsExact = (1 << 0)
+  };
+
+private:
+  ~SDivOperator(); // do not implement
+
+  friend class BinaryOperator;
+  friend class ConstantExpr;
+  void setIsExact(bool B) {
+    SubclassOptionalData = (SubclassOptionalData & ~IsExact) | (B * IsExact);
+  }
+
+public:
+  /// isExact - Test whether this division is known to be exact, with
+  /// zero remainder.
+  bool isExact() const {
+    return SubclassOptionalData & IsExact;
+  }
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const SDivOperator *) { return true; }
+  static inline bool classof(const ConstantExpr *CE) {
+    return CE->getOpcode() == Instruction::SDiv;
+  }
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::SDiv;
+  }
+  static inline bool classof(const Value *V) {
+    return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+           (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+  }
+};
+
+class GEPOperator : public Operator {
+  enum {
+    IsInBounds = (1 << 0)
+  };
+
+  ~GEPOperator(); // do not implement
+
+  friend class GetElementPtrInst;
+  friend class ConstantExpr;
+  void setIsInBounds(bool B) {
+    SubclassOptionalData =
+      (SubclassOptionalData & ~IsInBounds) | (B * IsInBounds);
+  }
+
+public:
+  /// isInBounds - Test whether this is an inbounds GEP, as defined
+  /// by LangRef.html.
+  bool isInBounds() const {
+    return SubclassOptionalData & IsInBounds;
+  }
+
+  inline op_iterator       idx_begin()       { return op_begin()+1; }
+  inline const_op_iterator idx_begin() const { return op_begin()+1; }
+  inline op_iterator       idx_end()         { return op_end(); }
+  inline const_op_iterator idx_end()   const { return op_end(); }
+
+  Value *getPointerOperand() {
+    return getOperand(0);
+  }
+  const Value *getPointerOperand() const {
+    return getOperand(0);
+  }
+  static unsigned getPointerOperandIndex() {
+    return 0U;                      // get index for modifying correct operand
+  }
+
+  /// getPointerOperandType - Method to return the pointer operand as a
+  /// PointerType.
+  const PointerType *getPointerOperandType() const {
+    return reinterpret_cast<const PointerType*>(getPointerOperand()->getType());
+  }
+
+  unsigned getNumIndices() const {  // Note: always non-negative
+    return getNumOperands() - 1;
+  }
+
+  bool hasIndices() const {
+    return getNumOperands() > 1;
+  }
+
+  /// hasAllZeroIndices - Return true if all of the indices of this GEP are
+  /// zeros.  If so, the result pointer and the first operand have the same
+  /// value, just potentially different types.
+  bool hasAllZeroIndices() const {
+    for (const_op_iterator I = idx_begin(), E = idx_end(); I != E; ++I) {
+      if (Constant *C = dyn_cast<Constant>(I))
+        if (C->isNullValue())
+          continue;
+      return false;
+    }
+    return true;
+  }
+
+  /// hasAllConstantIndices - Return true if all of the indices of this GEP are
+  /// constant integers.  If so, the result pointer and the first operand have
+  /// a constant offset between them.
+  bool hasAllConstantIndices() const {
+    for (const_op_iterator I = idx_begin(), E = idx_end(); I != E; ++I) {
+      if (!isa<ConstantInt>(I))
+        return false;
+    }
+    return true;
+  }
+  
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const GEPOperator *) { return true; }
+  static inline bool classof(const GetElementPtrInst *) { return true; }
+  static inline bool classof(const ConstantExpr *CE) {
+    return CE->getOpcode() == Instruction::GetElementPtr;
+  }
+  static inline bool classof(const Instruction *I) {
+    return I->getOpcode() == Instruction::GetElementPtr;
+  }
+  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