diff --git a/lib/Target/SparcV9/MachineInstrAnnot.h b/lib/Target/SparcV9/MachineInstrAnnot.h
index 13e68c0..070848a 100644
--- a/lib/Target/SparcV9/MachineInstrAnnot.h
+++ b/lib/Target/SparcV9/MachineInstrAnnot.h
@@ -37,7 +37,7 @@
 public:
   // Constructors
   CallArgInfo(Value* _argVal)
-    : argVal(_argVal), argCopyReg(TargetRegInfo::getInvalidRegNum()),
+    : argVal(_argVal), argCopyReg(SparcV9RegInfo::getInvalidRegNum()),
       passingMethod(0x0) {}
   
   CallArgInfo(const CallArgInfo& obj)
diff --git a/lib/Target/SparcV9/RegAlloc/LiveRangeInfo.h b/lib/Target/SparcV9/RegAlloc/LiveRangeInfo.h
index a8d0e71..c6accdb 100644
--- a/lib/Target/SparcV9/RegAlloc/LiveRangeInfo.h
+++ b/lib/Target/SparcV9/RegAlloc/LiveRangeInfo.h
@@ -34,7 +34,7 @@
 class LiveRange;
 class MachineInstr;
 class RegClass;
-class TargetRegInfo;
+class SparcV9RegInfo;
 class TargetMachine;
 class Value;
 class Function;
@@ -59,7 +59,7 @@
 
   std::vector<RegClass *> & RegClassList;// vector containing register classess
 
-  const TargetRegInfo& MRI;        // machine reg info
+  const SparcV9RegInfo& MRI;        // machine reg info
 
   std::vector<MachineInstr*> CallRetInstrList;  // a list of all call/ret instrs
 
diff --git a/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.cpp b/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.cpp
index e8d6010..4c156bc 100644
--- a/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.cpp
+++ b/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.cpp
@@ -1003,7 +1003,7 @@
 /// setRelRegsUsedByThisInst().
 ///
 static void markRegisterUsed(int RegNo, RegClass *RC, int RegType,
-                             const TargetRegInfo &TRI) {
+                             const SparcV9RegInfo &TRI) {
   unsigned classId = 0;
   int classRegNum = TRI.getClassRegNum(RegNo, classId);
   if (RC->getID() == classId)
diff --git a/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.h b/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.h
index 65cc2e1..f344f0e 100644
--- a/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.h
+++ b/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.h
@@ -69,7 +69,7 @@
   FunctionLiveVarInfo *LVI;             // LV information for this method 
                                         // (already computed for BBs) 
   LiveRangeInfo *LRI;                   // LR info  (will be computed)
-  const TargetRegInfo &MRI;             // Machine Register information
+  const SparcV9RegInfo &MRI;            // Machine Register information
   const unsigned NumOfRegClasses;       // recorded here for efficiency
 
   // Map to indicate whether operands of each MachineInstr have been
diff --git a/lib/Target/SparcV9/RegAlloc/RegClass.cpp b/lib/Target/SparcV9/RegAlloc/RegClass.cpp
index 49eceaf..a748c1a 100644
--- a/lib/Target/SparcV9/RegAlloc/RegClass.cpp
+++ b/lib/Target/SparcV9/RegAlloc/RegClass.cpp
@@ -23,7 +23,7 @@
 // createInterferenceGraph() above.
 //----------------------------------------------------------------------------
 RegClass::RegClass(const Function *M, 
-                   const TargetRegInfo *_MRI_,
+                   const SparcV9RegInfo *_MRI_,
 		   const TargetRegClassInfo *_MRC_)
                   :  Meth(M), MRI(_MRI_), MRC(_MRC_),
                      RegClassID( _MRC_->getRegClassID() ),
diff --git a/lib/Target/SparcV9/RegAlloc/RegClass.h b/lib/Target/SparcV9/RegAlloc/RegClass.h
index 05f53d7..0730de3 100644
--- a/lib/Target/SparcV9/RegAlloc/RegClass.h
+++ b/lib/Target/SparcV9/RegAlloc/RegClass.h
@@ -45,7 +45,7 @@
 //-----------------------------------------------------------------------------
 class RegClass {
   const Function *const Meth;           // Function we are working on
-  const TargetRegInfo *MRI;             // Machine register information 
+  const SparcV9RegInfo *MRI;            // Machine register information 
   const TargetRegClassInfo *const MRC;  // Machine reg. class for this RegClass
   const unsigned RegClassID;            // my int ID
 
@@ -87,7 +87,7 @@
  public:
 
   RegClass(const Function *M,
-	   const TargetRegInfo *_MRI_,
+	   const SparcV9RegInfo *_MRI_,
 	   const TargetRegClassInfo *_MRC_);
 
   inline void createInterferenceGraph() { IG.createGraph(); }
diff --git a/lib/Target/SparcV9/SparcV9CodeEmitter.cpp b/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
index a11594e..631db7c 100644
--- a/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
+++ b/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
@@ -474,7 +474,7 @@
 unsigned 
 SparcV9CodeEmitter::getRealRegNum(unsigned fakeReg,
                                   MachineInstr &MI) {
-  const TargetRegInfo &RI = *TM.getRegInfo();
+  const SparcV9RegInfo &RI = *TM.getRegInfo();
   unsigned regClass, regType = RI.getRegType(fakeReg);
   // At least map fakeReg into its class
   fakeReg = RI.getClassRegNum(fakeReg, regClass);
diff --git a/lib/Target/SparcV9/SparcV9InstrSelection.cpp b/lib/Target/SparcV9/SparcV9InstrSelection.cpp
index 352122c..dbe40ac 100644
--- a/lib/Target/SparcV9/SparcV9InstrSelection.cpp
+++ b/lib/Target/SparcV9/SparcV9InstrSelection.cpp
@@ -2527,7 +2527,7 @@
             const Type* argType = argVal->getType();
             unsigned regType = regInfo.getRegTypeForDataType(argType);
             unsigned argSize = target.getTargetData().getTypeSize(argType);
-            int regNumForArg = TargetRegInfo::getInvalidRegNum();
+            int regNumForArg = SparcV9RegInfo::getInvalidRegNum();
             unsigned regClassIDOfArgReg;
 
             // Check for FP arguments to varargs functions.
diff --git a/lib/Target/SparcV9/SparcV9RegClassInfo.h b/lib/Target/SparcV9/SparcV9RegClassInfo.h
index e01c69f..33c7961 100644
--- a/lib/Target/SparcV9/SparcV9RegClassInfo.h
+++ b/lib/Target/SparcV9/SparcV9RegClassInfo.h
@@ -9,7 +9,7 @@
 //
 // This file defines the register classes used by the SparcV9 target. It
 // implicitly defines (using enums) the "class register numbers" used in
-// the SparcV9 target, which are converted using a formula in the TargetRegInfo
+// the SparcV9 target, which are converted using a formula in the SparcV9RegInfo
 // class to "unified register numbers".
 //
 //===----------------------------------------------------------------------===//
diff --git a/lib/Target/SparcV9/SparcV9RegInfo.cpp b/lib/Target/SparcV9/SparcV9RegInfo.cpp
index a4afc4e..0c36d3b 100644
--- a/lib/Target/SparcV9/SparcV9RegInfo.cpp
+++ b/lib/Target/SparcV9/SparcV9RegInfo.cpp
@@ -36,7 +36,7 @@
 };
 
 SparcV9RegInfo::SparcV9RegInfo(const SparcV9TargetMachine &tgt)
-  : TargetRegInfo(tgt), NumOfIntArgRegs(6), NumOfFloatArgRegs(32)
+  : target (tgt), NumOfIntArgRegs (6), NumOfFloatArgRegs (32)
 {
   MachineRegClassArr.push_back(new SparcV9IntRegClass(IntRegClassID));
   MachineRegClassArr.push_back(new SparcV9FloatRegClass(FloatRegClassID));
diff --git a/lib/Target/SparcV9/SparcV9RegInfo.h b/lib/Target/SparcV9/SparcV9RegInfo.h
index bc11a64..da6e5ad 100644
--- a/lib/Target/SparcV9/SparcV9RegInfo.h
+++ b/lib/Target/SparcV9/SparcV9RegInfo.h
@@ -53,7 +53,7 @@
   // This defaults to marking a single register but may mark multiple
   // registers when a single number denotes paired registers.
   // 
-  virtual void markColorsUsed(unsigned RegInClass,
+  void markColorsUsed(unsigned RegInClass,
                               int UserRegType,
                               int RegTypeWanted,
                               std::vector<bool> &IsColorUsedArr) const {
@@ -69,7 +69,7 @@
   // for paired registers and other such silliness.
   // It returns -1 if no unused color is found.
   // 
-  virtual int findUnusedColor(int RegTypeWanted,
+  int findUnusedColor(int RegTypeWanted,
                           const std::vector<bool> &IsColorUsedArr) const {
     // find first unused color in the IsColorUsedArr directly
     unsigned NC = this->getNumOfAvailRegs();
@@ -82,30 +82,28 @@
 
   // This method should find a color which is not used by neighbors
   // (i.e., a false position in IsColorUsedArr) and 
-  virtual void colorIGNode(IGNode *Node,
-                           const std::vector<bool> &IsColorUsedArr) const = 0;
+  void colorIGNode(IGNode *Node,
+                           const std::vector<bool> &IsColorUsedArr) const;
 
   // Check whether a specific register is volatile, i.e., whether it is not
   // preserved across calls
-  virtual bool isRegVolatile(int Reg) const = 0;
+  bool isRegVolatile(int Reg) const;
 
   // Check whether a specific register is modified as a side-effect of the
   // call instruction itself,
-  virtual bool modifiedByCall(int Reg) const {return false; }
+  bool modifiedByCall(int Reg) const {return false; }
 
-  virtual const char* const getRegName(unsigned reg) const = 0;
+  virtual const char* const getRegName(unsigned reg) const;
 
   TargetRegClassInfo(unsigned ID, unsigned NVR, unsigned NAR)
     : RegClassID(ID), NumOfAvailRegs(NVR), NumOfAllRegs(NAR) {}
 };
 
-
-//---------------------------------------------------------------------------
-/// TargetRegInfo - Interface to register info of target machine
+/// SparcV9RegInfo - Interface to register info of SparcV9 target machine
 ///
-class TargetRegInfo {
-  TargetRegInfo(const TargetRegInfo &);  // DO NOT IMPLEMENT
-  void operator=(const TargetRegInfo &); // DO NOT IMPLEMENT
+class SparcV9RegInfo {
+  SparcV9RegInfo(const SparcV9RegInfo &);  // DO NOT IMPLEMENT
+  void operator=(const SparcV9RegInfo &); // DO NOT IMPLEMENT
 protected:
   // A vector of all machine register classes
   //
@@ -119,20 +117,21 @@
   //
   static int getInvalidRegNum() { return -1; }
 
-  TargetRegInfo(const TargetMachine& tgt) : target(tgt) { }
-  virtual ~TargetRegInfo() {
-    for (unsigned i = 0, e = MachineRegClassArr.size(); i != e; ++i)
-      delete MachineRegClassArr[i];
-  }
 
   // According the definition of a MachineOperand class, a Value in a
   // machine instruction can go into either a normal register or a 
   // condition code register. If isCCReg is true below, the ID of the condition
   // code register class will be returned. Otherwise, the normal register
   // class (eg. int, float) must be returned.
-  virtual unsigned getRegClassIDOfType  (const Type *type,
-					 bool isCCReg = false) const = 0;
-  virtual unsigned getRegClassIDOfRegType(int regType) const = 0;
+
+  // To find the register class used for a specified Type
+  //
+  unsigned getRegClassIDOfType  (const Type *type,
+					 bool isCCReg = false) const;
+
+  // To find the register class to which a specified register belongs
+  //
+  unsigned getRegClassIDOfRegType(int regType) const;
 
   unsigned getRegClassIDOfReg(int unifiedRegNum) const {
     unsigned classId = 0;
@@ -148,88 +147,48 @@
     return MachineRegClassArr[i]; 
   }
 
-  // returns the register that is hardwired to zero if any (-1 if none)
+  // getZeroRegNum - returns the register that is hardwired to always contain
+  // zero, if any (-1 if none). This is the unified register number.
   //
-  virtual unsigned getZeroRegNum() const = 0;
-
-  // Number of registers used for passing int args (usually 6: %o0 - %o5)
-  // and float args (usually 32: %f0 - %f31)
-  //
-  virtual unsigned const getNumOfIntArgRegs() const   = 0;
-  virtual unsigned const getNumOfFloatArgRegs() const = 0;
+  unsigned getZeroRegNum() const;
 
   // The following methods are used to color special live ranges (e.g.
   // method args and return values etc.) with specific hardware registers
   // as required. See SparcRegInfo.cpp for the implementation for Sparc.
   //
-  virtual void suggestRegs4MethodArgs(const Function *Func, 
-                                      LiveRangeInfo& LRI) const = 0;
+  void suggestRegs4MethodArgs(const Function *Func, 
+                                      LiveRangeInfo& LRI) const;
 
-  virtual void suggestRegs4CallArgs(MachineInstr *CallI, 
-                                    LiveRangeInfo& LRI) const = 0;
+  void suggestRegs4CallArgs(MachineInstr *CallI, 
+                                    LiveRangeInfo& LRI) const;
 
-  virtual void suggestReg4RetValue(MachineInstr *RetI, 
-				   LiveRangeInfo& LRI) const = 0;
+  void suggestReg4RetValue(MachineInstr *RetI, 
+				   LiveRangeInfo& LRI) const;
 
-  virtual void colorMethodArgs(const Function *Func,
+  void colorMethodArgs(const Function *Func,
                            LiveRangeInfo &LRI,
                            std::vector<MachineInstr*>& InstrnsBefore,
-                           std::vector<MachineInstr*>& InstrnsAfter) const = 0;
+                           std::vector<MachineInstr*>& InstrnsAfter) const;
 
-  // The following methods are used to generate "copy" machine instructions
-  // for an architecture. Currently they are used in TargetRegClass 
-  // interface. However, they can be moved to TargetInstrInfo interface if
-  // necessary.
-  //
-  // The function regTypeNeedsScratchReg() can be used to check whether a
-  // scratch register is needed to copy a register of type `regType' to
-  // or from memory.  If so, such a scratch register can be provided by
-  // the caller (e.g., if it knows which regsiters are free); otherwise
-  // an arbitrary one will be chosen and spilled by the copy instructions.
-  // If a scratch reg is needed, the reg. type that must be used
-  // for scratch registers is returned in scratchRegType.
-  //
-  virtual bool regTypeNeedsScratchReg(int RegType,
-                                      int& scratchRegType) const = 0;
-  
-  virtual void cpReg2RegMI(std::vector<MachineInstr*>& mvec,
-                           unsigned SrcReg, unsigned DestReg,
-                           int RegType) const = 0;
-  
-  virtual void cpReg2MemMI(std::vector<MachineInstr*>& mvec,
-                           unsigned SrcReg, unsigned DestPtrReg, int Offset,
-                           int RegType, int scratchReg = -1) const=0;
-
-  virtual void cpMem2RegMI(std::vector<MachineInstr*>& mvec,
-                           unsigned SrcPtrReg, int Offset, unsigned DestReg,
-                           int RegType, int scratchReg = -1) const=0;
-  
-  virtual void cpValue2Value(Value *Src, Value *Dest,
-                             std::vector<MachineInstr*>& mvec) const = 0;
 
   // Check whether a specific register is volatile, i.e., whether it is not
   // preserved across calls
-  inline virtual bool isRegVolatile(int RegClassID, int Reg) const {
+  inline bool isRegVolatile(int RegClassID, int Reg) const {
     return MachineRegClassArr[RegClassID]->isRegVolatile(Reg);
   }
 
   // Check whether a specific register is modified as a side-effect of the
   // call instruction itself,
-  inline virtual bool modifiedByCall(int RegClassID, int Reg) const {
+  inline bool modifiedByCall(int RegClassID, int Reg) const {
     return MachineRegClassArr[RegClassID]->modifiedByCall(Reg);
   }
   
-  // Returns the reg used for pushing the address when a method is called.
-  // This can be used for other purposes between calls
+  // getCallAddressReg - Returns the reg used for pushing the address
+  // when a method is called. This can be used for other purposes
+  // between calls
   //
-  virtual unsigned getCallAddressReg() const = 0;
+  unsigned getCallAddressReg() const;
 
-  // Returns the register containing the return address.
-  //It should be made sure that this 
-  // register contains the return value when a return instruction is reached.
-  //
-  virtual unsigned getReturnAddressReg() const = 0; 
-  
   // Each register class has a separate space for register IDs. To convert
   // a regId in a register class to a common Id, or vice versa,
   // we use the folloing two methods.
@@ -272,29 +231,18 @@
     return MachineRegClassArr[regClassID]->getRegName(regNumInClass);
   }
 
-  // Get the register type for a register identified different ways.
-  // Note that getRegTypeForLR(LR) != getRegTypeForDataType(LR->getType())!
-  // The reg class of a LR depends both on the Value types in it and whether
-  // they are CC registers or not (for example).
-  virtual int getRegTypeForDataType(const Type* type) const = 0;
-  virtual int getRegTypeForLR(const LiveRange *LR) const = 0;
-  virtual int getRegType(int unifiedRegNum) const = 0;
-  
-  // The following methods are used to get the frame/stack pointers
-  // 
-  virtual unsigned getFramePointer() const = 0;
-  virtual unsigned getStackPointer() const = 0;
-
   // This method gives the the number of bytes of stack space allocated 
-  // to a register when it is spilled to the stack.
+  // to a register when it is spilled to the stack, according to its
+  // register type.
   //
-  virtual int getSpilledRegSize(int RegType) const = 0;
-};
+  // For SparcV9, currently we allocate 8 bytes on stack for all 
+  // register types. We can optimize this later if necessary to save stack
+  // space (However, should make sure that stack alignment is correct)
+  //
+  int getSpilledRegSize(int RegType) const {
+    return 8;
+  }
 
-
-/// This class implements the virtual class TargetRegInfo for SparcV9.
-///
-class SparcV9RegInfo : public TargetRegInfo {
 private:
   // Number of registers used for passing int args (usually 6: %o0 - %o5)
   //
@@ -346,24 +294,10 @@
 
   SparcV9RegInfo(const SparcV9TargetMachine &tgt);
 
-  // To find the register class used for a specified Type
-  //
-  unsigned getRegClassIDOfType(const Type *type,
-                               bool isCCReg = false) const;
-
-  // To find the register class to which a specified register belongs
-  //
-  unsigned getRegClassIDOfRegType(int regType) const;
-  
-  // getZeroRegNum - returns the register that contains always zero this is the
-  // unified register number
-  //
-  virtual unsigned getZeroRegNum() const;
-
-  // getCallAddressReg - returns the reg used for pushing the address when a
-  // function is called. This can be used for other purposes between calls
-  //
-  unsigned getCallAddressReg() const;
+  ~SparcV9RegInfo() {
+    for (unsigned i = 0, e = MachineRegClassArr.size(); i != e; ++i)
+      delete MachineRegClassArr[i];
+  }
 
   // Returns the register containing the return address.
   // It should be made sure that this  register contains the return 
@@ -385,35 +319,10 @@
   int regNumForFPArg(unsigned RegType, bool inCallee, bool isVarArgsCall,
                      unsigned argNo, unsigned& regClassId) const;
   
-  // The following methods are used to color special live ranges (e.g.
-  // function args and return values etc.) with specific hardware registers
-  // as required. See SparcV9RegInfo.cpp for the implementation for SparcV9.
-  //
-  void suggestRegs4MethodArgs(const Function *Meth, 
-			      LiveRangeInfo& LRI) const;
-
-  void suggestRegs4CallArgs(MachineInstr *CallMI, 
-			    LiveRangeInfo& LRI) const; 
-
-  void suggestReg4RetValue(MachineInstr *RetMI, 
-                           LiveRangeInfo& LRI) const;
-  
-  void colorMethodArgs(const Function *Meth,  LiveRangeInfo& LRI,
-                       std::vector<MachineInstr*>& InstrnsBefore,
-                       std::vector<MachineInstr*>& InstrnsAfter) const;
 
   // method used for printing a register for debugging purposes
   //
   void printReg(const LiveRange *LR) const;
-  
-  // returns the # of bytes of stack space allocated for each register
-  // type. For SparcV9, currently we allocate 8 bytes on stack for all 
-  // register types. We can optimize this later if necessary to save stack
-  // space (However, should make sure that stack alignment is correct)
-  //
-  inline int getSpilledRegSize(int RegType) const {
-    return 8;
-  }
 
   // To obtain the return value and the indirect call address (if any)
   // contained in a CALL machine instruction
@@ -422,14 +331,19 @@
   const Value * getCallInstIndirectAddrVal(const MachineInstr *CallMI) const;
 
   // The following methods are used to generate "copy" machine instructions
-  // for an architecture.
+  // for an architecture. Currently they are used in TargetRegClass 
+  // interface. However, they can be moved to TargetInstrInfo interface if
+  // necessary.
   //
   // The function regTypeNeedsScratchReg() can be used to check whether a
   // scratch register is needed to copy a register of type `regType' to
   // or from memory.  If so, such a scratch register can be provided by
   // the caller (e.g., if it knows which regsiters are free); otherwise
   // an arbitrary one will be chosen and spilled by the copy instructions.
+  // If a scratch reg is needed, the reg. type that must be used
+  // for scratch registers is returned in scratchRegType.
   //
+
   bool regTypeNeedsScratchReg(int RegType,
                               int& scratchRegClassId) const;
 
@@ -456,8 +370,8 @@
   int getRegTypeForLR(const LiveRange *LR) const;
   int getRegType(int unifiedRegNum) const;
 
-  virtual unsigned getFramePointer() const;
-  virtual unsigned getStackPointer() const;
+  unsigned getFramePointer() const;
+  unsigned getStackPointer() const;
 };
 
 } // End llvm namespace
diff --git a/lib/Target/SparcV9/SparcV9TargetMachine.h b/lib/Target/SparcV9/SparcV9TargetMachine.h
index 9bc299c..65aa8b7 100644
--- a/lib/Target/SparcV9/SparcV9TargetMachine.h
+++ b/lib/Target/SparcV9/SparcV9TargetMachine.h
@@ -36,7 +36,7 @@
   
   virtual const TargetInstrInfo  *getInstrInfo() const { return &instrInfo; }
   virtual const TargetSchedInfo  *getSchedInfo() const { return &schedInfo; }
-  virtual const TargetRegInfo    *getRegInfo()   const { return &regInfo; }
+  virtual const SparcV9RegInfo   *getRegInfo()   const { return &regInfo; }
   virtual const TargetFrameInfo  *getFrameInfo() const { return &frameInfo; }
   virtual       TargetJITInfo    *getJITInfo()         { return &jitInfo; }
   virtual const MRegisterInfo    *getRegisterInfo() const {