diff --git a/lib/CodeGen/RegAlloc/InterferenceGraph.cpp b/lib/CodeGen/RegAlloc/InterferenceGraph.cpp
index a366c11..c90ae4a 100644
--- a/lib/CodeGen/RegAlloc/InterferenceGraph.cpp
+++ b/lib/CodeGen/RegAlloc/InterferenceGraph.cpp
@@ -133,8 +133,8 @@
 //            LiveRangeInfo::unionAndUpdateLRs for that purpose.
 //----------------------------------------------------------------------------
 
-void InterferenceGraph::mergeIGNodesOfLRs(const LiveRange *const LR1, 
-					  LiveRange *const LR2 ) {
+void InterferenceGraph::mergeIGNodesOfLRs(const LiveRange *LR1, 
+					  LiveRange *LR2) {
 
   assert( LR1 != LR2);                  // cannot merge the same live range
 
@@ -145,8 +145,8 @@
   assertIGNode( SrcNode );
 
   if( DEBUG_RA > 1) {
-    cerr << "Merging LRs: \""; LR1->printSet(); 
-    cerr << "\" and \""; LR2->printSet();
+    cerr << "Merging LRs: \""; printSet(*LR1); 
+    cerr << "\" and \""; printSet(*LR2);
     cerr << "\"\n";
   }
 
@@ -236,7 +236,7 @@
 
     if (Node) {
       cerr << " [" << Node->getIndex() << "] ";
-      Node->getParentLR()->printSet(); 
+      printSet(*Node->getParentLR());
       //int Deg = Node->getCurDegree();
       cerr << "\t <# of Neighs: " << Node->getNumOfNeighbors() << ">\n";
     }
diff --git a/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp b/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
index 590c88f..aef8431 100644
--- a/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
+++ b/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
@@ -12,7 +12,7 @@
 LiveRangeInfo::LiveRangeInfo(const Method *const M, 
 			     const TargetMachine& tm,
 			     std::vector<RegClass *> &RCL)
-                             : Meth(M), LiveRangeMap(), TM(tm),
+                             : Meth(M), TM(tm),
                                RegClassList(RCL), MRI(tm.getRegInfo())
 { }
 
@@ -48,18 +48,16 @@
 // Note: the caller must make sure that L1 and L2 are distinct and both
 // LRs don't have suggested colors
 //---------------------------------------------------------------------------
-void LiveRangeInfo::unionAndUpdateLRs(LiveRange *const L1, LiveRange *L2)
-{
-  assert( L1 != L2);
-  L1->setUnion( L2 );                   // add elements of L2 to L1
-  ValueSet::iterator L2It;
 
-  for( L2It = L2->begin() ; L2It != L2->end(); ++L2It) {
+void LiveRangeInfo::unionAndUpdateLRs(LiveRange *L1, LiveRange *L2) {
+  assert(L1 != L2 && (!L1->hasSuggestedColor() || !L2->hasSuggestedColor()));
+  set_union(*L1, *L2);                   // add elements of L2 to L1
 
+  for(ValueSet::iterator L2It = L2->begin(); L2It != L2->end(); ++L2It) {
     //assert(( L1->getTypeID() == L2->getTypeID()) && "Merge:Different types");
 
     L1->insert(*L2It);                  // add the var in L2 to L1
-    LiveRangeMap[ *L2It ] = L1;         // now the elements in L2 should map 
+    LiveRangeMap[*L2It] = L1;         // now the elements in L2 should map 
                                         //to L1    
   }
 
@@ -69,15 +67,15 @@
   // must have the same color.
 
   if(L2->hasSuggestedColor())
-    L1->setSuggestedColor( L2->getSuggestedColor() );
+    L1->setSuggestedColor(L2->getSuggestedColor());
 
 
-  if( L2->isCallInterference() )
+  if (L2->isCallInterference())
     L1->setCallInterference();
   
- 
-  L1->addSpillCost( L2->getSpillCost() ); // add the spill costs
-
+  // add the spill costs
+  L1->addSpillCost(L2->getSpillCost());
+  
   delete L2;                        // delete L2 as it is no longer needed
 }
 
@@ -394,7 +392,7 @@
   for( ; HMI != LiveRangeMap.end(); ++HMI) {
     if (HMI->first && HMI->second) {
       cerr << " " << RAV(HMI->first) << "\t: "; 
-      HMI->second->printSet(); cerr << "\n";
+      printSet(*HMI->second); cerr << "\n";
     }
   }
 }
diff --git a/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp b/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
index 90de8b9..938ab1b 100644
--- a/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
+++ b/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
@@ -15,7 +15,7 @@
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineCodeForMethod.h"
 #include "llvm/Analysis/LiveVar/MethodLiveVarInfo.h"
-#include "llvm/Analysis/LiveVar/LiveVarSet.h"
+#include "llvm/Analysis/LiveVar/ValueSet.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/MachineFrameInfo.h"
@@ -151,11 +151,11 @@
 // class as that of live var. The live var passed to this function is the 
 // LVset AFTER the instruction
 //----------------------------------------------------------------------------
-void PhyRegAlloc::addInterference(const Value *const Def, 
-				  const LiveVarSet *const LVSet,
-				  const bool isCallInst) {
+void PhyRegAlloc::addInterference(const Value *Def, 
+				  const ValueSet *LVSet,
+				  bool isCallInst) {
 
-  LiveVarSet::const_iterator LIt = LVSet->begin();
+  ValueSet::const_iterator LIt = LVSet->begin();
 
   // get the live range of instruction
   //
@@ -207,7 +207,7 @@
 //----------------------------------------------------------------------------
 
 void PhyRegAlloc::setCallInterferences(const MachineInstr *MInst, 
-				       const LiveVarSet *const LVSetAft ) {
+				       const ValueSet *LVSetAft) {
 
   // Now find the LR of the return value of the call
   // We do this because, we look at the LV set *after* the instruction
@@ -226,7 +226,7 @@
   if( DEBUG_RA)
     cerr << "\n For call inst: " << *MInst;
 
-  LiveVarSet::const_iterator LIt = LVSetAft->begin();
+  ValueSet::const_iterator LIt = LVSetAft->begin();
 
   // for each live var in live variable set after machine inst
   //
@@ -238,7 +238,7 @@
 
     if( LR && DEBUG_RA) {
       cerr << "\n\tLR Aft Call: ";
-      LR->printSet();
+      printSet(*LR);
     }
    
 
@@ -249,7 +249,7 @@
       LR->setCallInterference();
       if( DEBUG_RA) {
 	cerr << "\n  ++Added call interf for LR: " ;
-	LR->printSet();
+	printSet(*LR);
       }
     }
 
@@ -293,8 +293,7 @@
 
       // get the LV set after the instruction
       //
-      const LiveVarSet *const LVSetAI = 
-	LVI->getLiveVarSetAfterMInst(MInst, *BBI);
+      const ValueSet *LVSetAI = LVI->getLiveVarSetAfterMInst(MInst, *BBI);
     
       const bool isCallInst = TM.getInstrInfo().isCall(MInst->getOpCode());
 
@@ -416,15 +415,14 @@
 //----------------------------------------------------------------------------
 // This method will add interferences for incoming arguments to a method.
 //----------------------------------------------------------------------------
-void PhyRegAlloc::addInterferencesForArgs()
-{
-                                              // get the InSet of root BB
-  const LiveVarSet *const InSet = LVI->getInSetOfBB( Meth->front() );  
+void PhyRegAlloc::addInterferencesForArgs() {
+  // get the InSet of root BB
+  const ValueSet *InSet = LVI->getInSetOfBB(Meth->front());  
 
-                                              // get the argument list
+  // get the argument list
   const Method::ArgumentListType& ArgList = Meth->getArgumentList();  
 
-                                              // get an iterator to arg list
+  // get an iterator to arg list
   Method::ArgumentListType::const_iterator ArgIt = ArgList.begin();          
 
 
@@ -683,7 +681,7 @@
   unsigned RegType = MRI.getRegType( LR );
   int SpillOff = LR->getSpillOffFromFP();
   RegClass *RC = LR->getRegClass();
-  const LiveVarSet *LVSetBef =  LVI->getLiveVarSetBeforeMInst(MInst, BB);
+  const ValueSet *LVSetBef =  LVI->getLiveVarSetBeforeMInst(MInst, BB);
 
   mcInfo.pushTempValue(TM, MRI.getSpilledRegSize(RegType) );
   
@@ -715,10 +713,7 @@
     if(MIAft)
       AI->InstrnsAfter.push_front(MIAft);
     
-    
-  } 
-  else {   // if this is a Def
-
+  } else {   // if this is a Def
     // for a DEF, we have to store the value produced by this instruction
     // on the stack position allocated for this LR
 
@@ -736,22 +731,17 @@
   }  // if !DEF
 
   cerr << "\nFor Inst " << *MInst;
-  cerr << " - SPILLED LR: "; LR->printSet();
+  cerr << " - SPILLED LR: "; printSet(*LR);
   cerr << "\n - Added Instructions:";
-  if( MIBef ) cerr <<  *MIBef;
+  if (MIBef) cerr <<  *MIBef;
   cerr <<  *AdIMid;
-  if( MIAft ) cerr <<  *MIAft;
+  if (MIAft) cerr <<  *MIAft;
 
-  Op.setRegForValue( TmpRegU );    // set the opearnd
-
-
+  Op.setRegForValue(TmpRegU);    // set the opearnd
 }
 
 
 
-
-
-
 //----------------------------------------------------------------------------
 // We can use the following method to get a temporary register to be used
 // BEFORE any given machine instruction. If there is a register available,
@@ -764,7 +754,7 @@
 int PhyRegAlloc::getUsableUniRegAtMI(RegClass *RC, 
 				  const int RegType,
 				  const MachineInstr *MInst, 
-				  const LiveVarSet *LVSetBef,
+				  const ValueSet *LVSetBef,
 				  MachineInstr *MIBef,
 				  MachineInstr *MIAft) {
 
@@ -801,7 +791,7 @@
 //----------------------------------------------------------------------------
 int PhyRegAlloc::getUnusedUniRegAtMI(RegClass *RC, 
 				  const MachineInstr *MInst, 
-				  const LiveVarSet *LVSetBef) {
+				  const ValueSet *LVSetBef) {
 
   unsigned NumAvailRegs =  RC->getNumOfAvailRegs();
   
@@ -810,7 +800,7 @@
   for(unsigned i=0; i <  NumAvailRegs; i++)     // Reset array
       IsColorUsedArr[i] = false;
       
-  LiveVarSet::const_iterator LIt = LVSetBef->begin();
+  ValueSet::const_iterator LIt = LVSetBef->begin();
 
   // for each live var in live variable set after machine inst
   for( ; LIt != LVSetBef->end(); ++LIt) {