diff --git a/lib/CodeGen/RegAlloc/IGNode.cpp b/lib/CodeGen/RegAlloc/IGNode.cpp
index 795e8b71524..c8fca7a23b6 100644
--- a/lib/CodeGen/RegAlloc/IGNode.cpp
+++ b/lib/CodeGen/RegAlloc/IGNode.cpp
@@ -1,3 +1,9 @@
+//===-- IGNode.cpp -------------------------------------------------------===//
+// 
+//  class IGNode for coloring-based register allocation for LLVM.
+// 
+//===----------------------------------------------------------------------===//
+
 #include "llvm/CodeGen/IGNode.h"
 #include <algorithm>
 #include <iostream>
diff --git a/lib/CodeGen/RegAlloc/InterferenceGraph.cpp b/lib/CodeGen/RegAlloc/InterferenceGraph.cpp
index 412f35fe932..217077eaa31 100644
--- a/lib/CodeGen/RegAlloc/InterferenceGraph.cpp
+++ b/lib/CodeGen/RegAlloc/InterferenceGraph.cpp
@@ -1,6 +1,12 @@
+//===-- InterferenceGraph.cpp ---------------------------------------------===//
+// 
+//  Interference graph for coloring-based register allocation for LLVM.
+// 
+//===----------------------------------------------------------------------===//
+
 #include "llvm/CodeGen/InterferenceGraph.h"
-#include "Support/STLExtras.h"
 #include "llvm/CodeGen/RegAllocCommon.h"
+#include "Support/STLExtras.h"
 #include <algorithm>
 using std::cerr;
 
@@ -14,7 +20,7 @@ InterferenceGraph::InterferenceGraph(RegClass *const RC) : RegCl(RC),
 {   
   IG = NULL;         
   Size = 0;            
-  if( DEBUG_RA) {
+  if( DEBUG_RA >= RA_DEBUG_Interference) {
     cerr << "Interference graph created!\n";
   }
 }
@@ -76,17 +82,15 @@ void InterferenceGraph::setInterference(const LiveRange *const LR1,
   IGNode *const IGNode1 = LR1->getUserIGNode();
   IGNode *const IGNode2 = LR2->getUserIGNode();
 
-  if( DEBUG_RA) {
-    assertIGNode( IGNode1 );   
-    assertIGNode( IGNode2 );
-  }
+  assertIGNode( IGNode1 );   
+  assertIGNode( IGNode2 );
   
   const unsigned int row = IGNode1->getIndex();
   const unsigned int col = IGNode2->getIndex();
 
   char *val;
 
-  if( DEBUG_RA > 1) 
+  if( DEBUG_RA >= RA_DEBUG_Interference > 1) 
     cerr << "setting intf for: [" << row << "][" <<  col << "]\n"; 
 
   ( row > col) ?  val = &IG[row][col]: val = &IG[col][row]; 
@@ -107,11 +111,8 @@ unsigned InterferenceGraph::getInterference(const LiveRange *const LR1,
 					   const LiveRange *const LR2 ) const {
 
   assert(LR1 != LR2);
-
-  if( DEBUG_RA) {
-    assertIGNode( LR1->getUserIGNode() );  
-    assertIGNode( LR2->getUserIGNode() );
-  }
+  assertIGNode( LR1->getUserIGNode() );  
+  assertIGNode( LR2->getUserIGNode() );
 
   const unsigned int row = LR1->getUserIGNode()->getIndex();
   const unsigned int col = LR2->getUserIGNode()->getIndex();
@@ -144,7 +145,7 @@ void InterferenceGraph::mergeIGNodesOfLRs(const LiveRange *LR1,
   assertIGNode( DestNode );
   assertIGNode( SrcNode );
 
-  if( DEBUG_RA > 1) {
+  if( DEBUG_RA >= RA_DEBUG_Interference > 1) {
     cerr << "Merging LRs: \""; printSet(*LR1); 
     cerr << "\" and \""; printSet(*LR2);
     cerr << "\"\n";
diff --git a/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp b/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
index 6a992b1ee35..7ad70186663 100644
--- a/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
+++ b/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
@@ -1,4 +1,11 @@
+//===-- LiveRangeInfo.cpp -------------------------------------------------===//
+// 
+//  Live range construction for coloring-based register allocation for LLVM.
+// 
+//===----------------------------------------------------------------------===//
+
 #include "llvm/CodeGen/LiveRangeInfo.h"
+#include "llvm/CodeGen/RegAllocCommon.h"
 #include "llvm/CodeGen/RegClass.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineCodeForBasicBlock.h"
@@ -6,7 +13,6 @@
 #include "llvm/Function.h"
 #include "llvm/BasicBlock.h"
 #include "Support/SetOperations.h"
-#include "llvm/CodeGen/RegAllocCommon.h"
 using std::cerr;
 
 LiveRangeInfo::LiveRangeInfo(const Function *F, const TargetMachine &tm,
@@ -80,8 +86,8 @@ void LiveRangeInfo::unionAndUpdateLRs(LiveRange *L1, LiveRange *L2) {
 //---------------------------------------------------------------------------
 void LiveRangeInfo::constructLiveRanges() {  
 
-  if (DEBUG_RA) 
-    cerr << "Consturcting Live Ranges ...\n";
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) 
+    cerr << "Constructing Live Ranges ...\n";
 
   // first find the live ranges for all incoming args of the function since
   // those LRs start from the start of the function
@@ -97,8 +103,8 @@ void LiveRangeInfo::constructLiveRanges() {
     ArgRange->setRegClass(RegClassList[rcid]);
 
     			   
-    if( DEBUG_RA > 1)
-      cerr << " adding LiveRange for argument " << RAV(AI) << "\n";
+    if( DEBUG_RA >= RA_DEBUG_LiveRanges)
+      cerr << " Adding LiveRange for argument " << RAV(AI) << "\n";
   }
 
   // Now suggest hardware registers for these function args 
@@ -133,7 +139,7 @@ void LiveRangeInfo::constructLiveRanges() {
       // iterate over  MI operands to find defs
       for (MachineInstr::val_op_iterator OpI = MInst->begin(),
              OpE = MInst->end(); OpI != OpE; ++OpI) {
-	if(DEBUG_RA) {
+	if(DEBUG_RA >= RA_DEBUG_LiveRanges) {
 	  MachineOperand::MachineOperandType OpTyp = 
 	    OpI.getMachineOperand().getOperandType();
 
@@ -161,7 +167,7 @@ void LiveRangeInfo::constructLiveRanges() {
 	    DefRange->insert(Def);          // add the instruction (def) to it
 	    LiveRangeMap[ Def ] = DefRange; // update the map
 
-	    if (DEBUG_RA > 1)
+	    if (DEBUG_RA >= RA_DEBUG_LiveRanges)
 	      cerr << "  creating a LR for def: " << RAV(Def) << "\n";
 
 	    // set the register class of the new live range
@@ -174,7 +180,7 @@ void LiveRangeInfo::constructLiveRanges() {
 			    OpI.getMachineOperand().getVRegValue(), isCC );
 
 
-	    if (isCC && DEBUG_RA)
+	    if (isCC && DEBUG_RA >= RA_DEBUG_LiveRanges)
 	      cerr  << "\a**created a LR for a CC reg:"
                     << RAV(OpI.getMachineOperand().getVRegValue());
 
@@ -185,9 +191,8 @@ void LiveRangeInfo::constructLiveRanges() {
 	                                    // to the merged set
 	    LiveRangeMap[Def] = DefRange; 
 
-	    if (DEBUG_RA > 1)
-	      cerr << "   added to an existing LR for def: "
-                   << RAV(Def) << "\n";
+	    if (DEBUG_RA >= RA_DEBUG_LiveRanges)
+	      cerr << "   Added to existing LR for def: " << RAV(Def) << "\n";
 	  }
 
 	} // if isDef()
@@ -205,7 +210,7 @@ void LiveRangeInfo::constructLiveRanges() {
 
   suggestRegs4CallRets();
 
-  if( DEBUG_RA) 
+  if( DEBUG_RA >= RA_DEBUG_LiveRanges) 
     cerr << "Initial Live Ranges constructed!\n";
 
 }
@@ -260,8 +265,8 @@ void LiveRangeInfo::suggestRegs4CallRets()
 //---------------------------------------------------------------------------
 void LiveRangeInfo::coalesceLRs()  
 {
-  if(DEBUG_RA) 
-    cerr << "\nCoalscing LRs ...\n";
+  if(DEBUG_RA >= RA_DEBUG_LiveRanges) 
+    cerr << "\nCoalescing LRs ...\n";
 
   for(Function::const_iterator BBI = Meth->begin(), BBE = Meth->end();
       BBI != BBE; ++BBI) {
@@ -275,7 +280,7 @@ void LiveRangeInfo::coalesceLRs()
       
       const MachineInstr * MInst = *MInstIterator; 
 
-      if( DEBUG_RA > 1) {
+      if( DEBUG_RA >= RA_DEBUG_LiveRanges) {
 	cerr << " *Iterating over machine instr ";
 	MInst->dump();
 	cerr << "\n";
@@ -296,7 +301,7 @@ void LiveRangeInfo::coalesceLRs()
  	    LiveRange *LROfUse = getLiveRangeForValue( *UseI );
 	    if (!LROfUse) {             // if LR of use is not found
 	      //don't warn about labels
-	      if (!isa<BasicBlock>(*UseI) && DEBUG_RA)
+	      if (!isa<BasicBlock>(*UseI) && DEBUG_RA >= RA_DEBUG_LiveRanges)
 		cerr << " !! Warning: No LR for use " << RAV(*UseI) << "\n";
 	      continue;                 // ignore and continue
 	    }
@@ -331,8 +336,8 @@ void LiveRangeInfo::coalesceLRs()
     } // for all machine instructions
   } // for all BBs
 
-  if (DEBUG_RA) 
-    cerr << "\nCoalscing Done!\n";
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) 
+    cerr << "\nCoalescing Done!\n";
 }
 
 
@@ -347,8 +352,9 @@ void LiveRangeInfo::printLiveRanges() {
   cerr << "\nPrinting Live Ranges from Hash Map:\n";
   for( ; HMI != LiveRangeMap.end(); ++HMI) {
     if (HMI->first && HMI->second) {
-      cerr << " " << RAV(HMI->first) << "\t: "; 
-      printSet(*HMI->second); cerr << "\n";
+      cerr << " Value* " << RAV(HMI->first) << "\t: "; 
+      cerr << "LR# " << HMI->second->getUserIGNode()->getIndex();
+      cerr << "\t:Values = "; printSet(*HMI->second); cerr << "\n";
     }
   }
 }
diff --git a/lib/CodeGen/RegAlloc/Makefile b/lib/CodeGen/RegAlloc/Makefile
index f2b4aa8a9d1..aa70f5ab16f 100644
--- a/lib/CodeGen/RegAlloc/Makefile
+++ b/lib/CodeGen/RegAlloc/Makefile
@@ -4,4 +4,6 @@ DIRS  =
 
 LIBRARYNAME = regalloc
 
+BUILD_ARCHIVE = 1
+
 include $(LEVEL)/Makefile.common
diff --git a/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp b/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
index 415c7989989..9faa9cbcad7 100644
--- a/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
+++ b/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
@@ -5,6 +5,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/CodeGen/RegisterAllocation.h"
+#include "llvm/CodeGen/RegAllocCommon.h"
 #include "llvm/CodeGen/PhyRegAlloc.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineInstrAnnot.h"
@@ -17,24 +18,25 @@
 #include "llvm/Function.h"
 #include "llvm/Type.h"
 #include "llvm/iOther.h"
-#include "llvm/CodeGen/RegAllocCommon.h"
-#include "Support/CommandLine.h"
 #include "Support/STLExtras.h"
 #include <math.h>
 using std::cerr;
 using std::vector;
 
 RegAllocDebugLevel_t DEBUG_RA;
+
 static cl::opt<RegAllocDebugLevel_t, true>
 DRA_opt("dregalloc", cl::Hidden, cl::location(DEBUG_RA),
         cl::desc("enable register allocation debugging information"),
         cl::values(
-  clEnumValN(RA_DEBUG_None   , "n", "disable debug output"),
-  clEnumValN(RA_DEBUG_Normal , "y", "enable debug output"),
-  clEnumValN(RA_DEBUG_Verbose, "v", "enable extra debug output"),
+  clEnumValN(RA_DEBUG_None   ,     "n", "disable debug output"),
+  clEnumValN(RA_DEBUG_Results,     "y", "debug output for allocation results"),
+  clEnumValN(RA_DEBUG_Coloring,    "c", "debug output for graph coloring step"),
+  clEnumValN(RA_DEBUG_Interference,"ig","debug output for interference graphs"),
+  clEnumValN(RA_DEBUG_LiveRanges , "lr","debug output for live ranges"),
+  clEnumValN(RA_DEBUG_Verbose,     "v", "extra debug output"),
                    0));
 
-
 //----------------------------------------------------------------------------
 // RegisterAllocation pass front end...
 //----------------------------------------------------------------------------
@@ -104,7 +106,7 @@ PhyRegAlloc::~PhyRegAlloc() {
 // and IGNodeList (one in each IG). The actual nodes will be pushed later. 
 //----------------------------------------------------------------------------
 void PhyRegAlloc::createIGNodeListsAndIGs() {
-  if (DEBUG_RA) cerr << "Creating LR lists ...\n";
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) cerr << "Creating LR lists ...\n";
 
   // hash map iterator
   LiveRangeMapType::const_iterator HMI = LRI.getLiveRangeMap()->begin();   
@@ -116,18 +118,16 @@ void PhyRegAlloc::createIGNodeListsAndIGs() {
     if (HMI->first) { 
       LiveRange *L = HMI->second;   // get the LiveRange
       if (!L) { 
-        if (DEBUG_RA) {
-          cerr << "\n*?!?Warning: Null liver range found for: "
-               << RAV(HMI->first) << "\n";
-        }
+        if (DEBUG_RA)
+          cerr << "\n**** ?!?WARNING: NULL LIVE RANGE FOUND FOR: "
+               << RAV(HMI->first) << "****\n";
         continue;
       }
-                                        // if the Value * is not null, and LR  
-                                        // is not yet written to the IGNodeList
+
+      // if the Value * is not null, and LR is not yet written to the IGNodeList
       if (!(L->getUserIGNode())  ) {  
         RegClass *const RC =           // RegClass of first value in the LR
           RegClassList[ L->getRegClass()->getID() ];
-        
         RC->addLRToIG(L);              // add this LR to an IG
       }
     }
@@ -137,19 +137,17 @@ void PhyRegAlloc::createIGNodeListsAndIGs() {
   for ( unsigned rc=0; rc < NumOfRegClasses ; rc++)  
     RegClassList[rc]->createInterferenceGraph();
 
-  if (DEBUG_RA)
-    cerr << "LRLists Created!\n";
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) cerr << "LRLists Created!\n";
 }
 
 
-
-
 //----------------------------------------------------------------------------
 // This method will add all interferences at for a given instruction.
 // Interence occurs only if the LR of Def (Inst or Arg) is of the same reg 
 // class as that of live var. The live var passed to this function is the 
 // LVset AFTER the instruction
 //----------------------------------------------------------------------------
+
 void PhyRegAlloc::addInterference(const Value *Def, 
 				  const ValueSet *LVSet,
 				  bool isCallInst) {
@@ -173,26 +171,16 @@ void PhyRegAlloc::addInterference(const Value *Def,
       cerr << "< Def=" << RAV(Def) << ", Lvar=" << RAV(*LIt) << "> ";
 
     //  get the live range corresponding to live var
-    //
+    // 
     LiveRange *LROfVar = LRI.getLiveRangeForValue(*LIt);
 
     // LROfVar can be null if it is a const since a const 
     // doesn't have a dominating def - see Assumptions above
     //
-    if (LROfVar) {  
-      if (LROfDef == LROfVar)            // do not set interf for same LR
-	continue;
-
-      // if 2 reg classes are the same set interference
-      //
-      if (RCOfDef == LROfVar->getRegClass()) {
-	RCOfDef->setInterference( LROfDef, LROfVar);  
-      } else if (DEBUG_RA >= RA_DEBUG_Verbose)  { 
-        // we will not have LRs for values not explicitly allocated in the
-        // instruction stream (e.g., constants)
-        cerr << " warning: no live range for " << RAV(*LIt) << "\n";
-      }
-    }
+    if (LROfVar)
+      if (LROfDef != LROfVar)                  // do not set interf for same LR
+        if (RCOfDef == LROfVar->getRegClass()) // 2 reg classes are the same
+          RCOfDef->setInterference( LROfDef, LROfVar);  
   }
 }
 
@@ -208,7 +196,7 @@ void PhyRegAlloc::addInterference(const Value *Def,
 void PhyRegAlloc::setCallInterferences(const MachineInstr *MInst, 
 				       const ValueSet *LVSetAft) {
 
-  if (DEBUG_RA)
+  if (DEBUG_RA >= RA_DEBUG_Interference)
     cerr << "\n For call inst: " << *MInst;
 
   ValueSet::const_iterator LIt = LVSetAft->begin();
@@ -221,18 +209,17 @@ void PhyRegAlloc::setCallInterferences(const MachineInstr *MInst,
     //
     LiveRange *const LR = LRI.getLiveRangeForValue(*LIt ); 
 
-    if (LR && DEBUG_RA) {
-      cerr << "\n\tLR Aft Call: ";
-      printSet(*LR);
-    }
-   
     // LR can be null if it is a const since a const 
     // doesn't have a dominating def - see Assumptions above
     //
-    if (LR )   {  
+    if (LR ) {  
+      if (DEBUG_RA >= RA_DEBUG_Interference) {
+        cerr << "\n\tLR after Call: ";
+        printSet(*LR);
+      }
       LR->setCallInterference();
-      if (DEBUG_RA) {
-	cerr << "\n  ++Added call interf for LR: " ;
+      if (DEBUG_RA >= RA_DEBUG_Interference) {
+	cerr << "\n  ++After adding call interference for LR: " ;
 	printSet(*LR);
       }
     }
@@ -274,7 +261,8 @@ void PhyRegAlloc::setCallInterferences(const MachineInstr *MInst,
 void PhyRegAlloc::buildInterferenceGraphs()
 {
 
-  if (DEBUG_RA) cerr << "Creating interference graphs ...\n";
+  if (DEBUG_RA >= RA_DEBUG_Interference)
+    cerr << "Creating interference graphs ...\n";
 
   unsigned BBLoopDepthCost;
   for (Function::const_iterator BBI = Meth->begin(), BBE = Meth->end();
@@ -351,9 +339,8 @@ void PhyRegAlloc::buildInterferenceGraphs()
   //  
   addInterferencesForArgs();          
 
-  if (DEBUG_RA)
-    cerr << "Interference graphs calculted!\n";
-
+  if (DEBUG_RA >= RA_DEBUG_Interference)
+    cerr << "Interference graphs calculated!\n";
 }
 
 
@@ -403,15 +390,16 @@ void PhyRegAlloc::addInterf4PseudoInstr(const MachineInstr *MInst) {
 //----------------------------------------------------------------------------
 // This method will add interferences for incoming arguments to a function.
 //----------------------------------------------------------------------------
+
 void PhyRegAlloc::addInterferencesForArgs() {
   // get the InSet of root BB
   const ValueSet &InSet = LVI->getInSetOfBB(&Meth->front());  
 
-  for (Function::const_aiterator AI = Meth->abegin(); AI != Meth->aend(); ++AI) {
+  for (Function::const_aiterator AI=Meth->abegin(); AI != Meth->aend(); ++AI) {
     // add interferences between args and LVars at start 
     addInterference(AI, &InSet, false);
     
-    if (DEBUG_RA >= RA_DEBUG_Verbose)
+    if (DEBUG_RA >= RA_DEBUG_Interference)
       cerr << " - %% adding interference for  argument " << RAV(AI) << "\n";
   }
 }
@@ -442,8 +430,8 @@ PrependInstructions(vector<MachineInstr *> &IBef,
       for (AdIt = IBef.begin(); AdIt != IBef.end() ; ++AdIt)
         {
           if (DEBUG_RA) {
-            if (OrigMI) cerr << "For MInst: " << *OrigMI;
-            cerr << msg << " PREPENDed instr: " << **AdIt << "\n";
+            if (OrigMI) cerr << "For MInst:\n  " << *OrigMI;
+            cerr << msg << "PREPENDed instr:\n  " << **AdIt << "\n";
           }
           MII = MIVec.insert(MII, *AdIt);
           ++MII;
@@ -464,8 +452,8 @@ AppendInstructions(std::vector<MachineInstr *> &IAft,
       for ( AdIt = IAft.begin(); AdIt != IAft.end() ; ++AdIt )
         {
           if (DEBUG_RA) {
-            if (OrigMI) cerr << "For MInst: " << *OrigMI;
-            cerr << msg << " APPENDed instr: "  << **AdIt << "\n";
+            if (OrigMI) cerr << "For MInst:\n  " << *OrigMI;
+            cerr << msg << "APPENDed instr:\n  "  << **AdIt << "\n";
           }
           ++MII;    // insert before the next instruction
           MII = MIVec.insert(MII, *AdIt);
@@ -674,9 +662,9 @@ void PhyRegAlloc::insertCode4SpilledLR(const LiveRange *LR,
   AI.InstrnsAfter.insert(AI.InstrnsAfter.begin(), MIAft.begin(), MIAft.end());
   
   if (DEBUG_RA) {
-    cerr << "\nFor Inst " << *MInst;
-    cerr << " - SPILLED LR: "; printSet(*LR);
-    cerr << "\n - Added Instructions:";
+    cerr << "\nFor Inst:\n  " << *MInst;
+    cerr << "SPILLED LR# " << LR->getUserIGNode()->getIndex();
+    cerr << "; added Instructions:";
     for_each(MIBef.begin(), MIBef.end(), std::mem_fun(&MachineInstr::dump));
     for_each(MIAft.begin(), MIAft.end(), std::mem_fun(&MachineInstr::dump));
   }
@@ -1015,8 +1003,6 @@ void PhyRegAlloc::printLabel(const Value *const Val) {
 
 void PhyRegAlloc::markUnusableSugColors()
 {
-  if (DEBUG_RA ) cerr << "\nmarking unusable suggested colors ...\n";
-
   // hash map iterator
   LiveRangeMapType::const_iterator HMI = (LRI.getLiveRangeMap())->begin();   
   LiveRangeMapType::const_iterator HMIEnd = (LRI.getLiveRangeMap())->end();   
@@ -1048,7 +1034,7 @@ void PhyRegAlloc::markUnusableSugColors()
 //----------------------------------------------------------------------------
 
 void PhyRegAlloc::allocateStackSpace4SpilledLRs() {
-  if (DEBUG_RA) cerr << "\nsetting LR stack offsets ...\n";
+  if (DEBUG_RA) cerr << "\nSetting LR stack offsets for spills...\n";
 
   LiveRangeMapType::const_iterator HMI    = LRI.getLiveRangeMap()->begin();   
   LiveRangeMapType::const_iterator HMIEnd = LRI.getLiveRangeMap()->end();   
@@ -1056,8 +1042,13 @@ void PhyRegAlloc::allocateStackSpace4SpilledLRs() {
   for ( ; HMI != HMIEnd ; ++HMI) {
     if (HMI->first && HMI->second) {
       LiveRange *L = HMI->second;      // get the LiveRange
-      if (!L->hasColor())   //  NOTE: ** allocating the size of long Type **
-        L->setSpillOffFromFP(mcInfo.allocateSpilledValue(TM, Type::LongTy));
+      if (!L->hasColor()) {   //  NOTE: ** allocating the size of long Type **
+        int stackOffset = mcInfo.allocateSpilledValue(TM, Type::LongTy);
+        L->setSpillOffFromFP(stackOffset);
+        if (DEBUG_RA)
+          cerr << "  LR# " << L->getUserIGNode()->getIndex()
+               << ": stack-offset = " << stackOffset << "\n";
+      }
     }
   } // for all LR's in hash map
 }
@@ -1077,7 +1068,7 @@ void PhyRegAlloc::allocateRegisters()
   //
   LRI.constructLiveRanges();            // create LR info
 
-  if (DEBUG_RA)
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges)
     LRI.printLiveRanges();
   
   createIGNodeListsAndIGs();            // create IGNode list and IGs
@@ -1085,7 +1076,7 @@ void PhyRegAlloc::allocateRegisters()
   buildInterferenceGraphs();            // build IGs in all reg classes
   
   
-  if (DEBUG_RA) {
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) {
     // print all LRs in all reg classes
     for ( unsigned rc=0; rc < NumOfRegClasses  ; rc++)  
       RegClassList[rc]->printIGNodeList(); 
@@ -1099,7 +1090,7 @@ void PhyRegAlloc::allocateRegisters()
   LRI.coalesceLRs();                    // coalesce all live ranges
   
 
-  if (DEBUG_RA) {
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) {
     // print all LRs in all reg classes
     for ( unsigned rc=0; rc < NumOfRegClasses  ; rc++)  
       RegClassList[ rc ]->printIGNodeList(); 
@@ -1139,8 +1130,8 @@ void PhyRegAlloc::allocateRegisters()
   updateMachineCode(); 
 
   if (DEBUG_RA) {
+    cerr << "\n**** Machine Code After Register Allocation:\n\n";
     MachineCodeForMethod::get(Meth).dump();
-    printMachineCode();                   // only for DEBUGGING
   }
 }
 
diff --git a/lib/CodeGen/RegAlloc/RegClass.cpp b/lib/CodeGen/RegAlloc/RegClass.cpp
index 5998f1fd664..b92b70997ba 100644
--- a/lib/CodeGen/RegAlloc/RegClass.cpp
+++ b/lib/CodeGen/RegAlloc/RegClass.cpp
@@ -1,3 +1,9 @@
+//===-- RegClass.cpp -----------------------------------------------------===//
+// 
+//  class RegClass for coloring-based register allocation for LLVM.
+// 
+//===----------------------------------------------------------------------===//
+
 #include "llvm/CodeGen/RegClass.h"
 #include "llvm/CodeGen/RegAllocCommon.h"
 using std::cerr;
@@ -11,7 +17,7 @@ RegClass::RegClass(const Function *M,
 		   const ReservedColorListType *RCL)
                   :  Meth(M), MRC(Mrc), RegClassID( Mrc->getRegClassID() ),
                      IG(this), IGNodeStack(), ReservedColorList(RCL) {
-  if( DEBUG_RA)
+  if( DEBUG_RA >= RA_DEBUG_Interference)
     cerr << "Created Reg Class: " << RegClassID << "\n";
 
   IsColorUsedArr.resize(Mrc->getNumOfAllRegs());
@@ -24,7 +30,8 @@ RegClass::RegClass(const Function *M,
 //----------------------------------------------------------------------------
 void RegClass::colorAllRegs()
 {
-  if(DEBUG_RA) cerr << "Coloring IG of reg class " << RegClassID << " ...\n";
+  if(DEBUG_RA >= RA_DEBUG_Coloring)
+    cerr << "Coloring IG of reg class " << RegClassID << " ...\n";
 
                                         // pre-color IGNodes
   pushAllIGNodes();                     // push all IG Nodes
@@ -57,7 +64,7 @@ void RegClass::pushAllIGNodes()
                                         // push non-constrained IGNodes
   bool PushedAll  = pushUnconstrainedIGNodes(); 
 
-  if( DEBUG_RA) {
+  if( DEBUG_RA >= RA_DEBUG_Coloring) {
     cerr << " Puhsed all-unconstrained IGNodes. ";
     if( PushedAll ) cerr << " No constrained nodes left.";
     cerr << "\n";
@@ -88,7 +95,7 @@ void RegClass::pushAllIGNodes()
     //
     NeedMoreSpills = !pushUnconstrainedIGNodes(); 
 
-    if (DEBUG_RA)
+    if (DEBUG_RA >= RA_DEBUG_Coloring)
       cerr << "\nConstrained IG Node found !@!" << IGNodeSpill->getIndex();
 
   } while(NeedMoreSpills);            // repeat until we have pushed all 
@@ -129,7 +136,7 @@ bool  RegClass::pushUnconstrainedIGNodes()
       IGNodeStack.push( IGNode );       // push IGNode on to the stack
       IGNode->pushOnStack();            // set OnStack and dec deg of neighs
 
-      if (DEBUG_RA > 1) {
+      if (DEBUG_RA >= RA_DEBUG_Coloring) {
 	cerr << " pushed un-constrained IGNode " << IGNode->getIndex() ;
 	cerr << " on to stack\n";
       }
@@ -230,7 +237,7 @@ void RegClass::colorIGNode(IGNode *const Node)
     MRC->colorIGNode(Node, IsColorUsedArr);
   }
   else {
-    if( DEBUG_RA ) {
+    if( DEBUG_RA >= RA_DEBUG_Coloring) {
       cerr << " Node " << Node->getIndex();
       cerr << " already colored with color " << Node->getColor() << "\n";
     }
@@ -238,7 +245,7 @@ void RegClass::colorIGNode(IGNode *const Node)
 
 
   if( !Node->hasColor() ) {
-    if( DEBUG_RA ) {
+    if( DEBUG_RA >= RA_DEBUG_Coloring) {
       cerr << " Node " << Node->getIndex();
       cerr << " - could not find a color (needs spilling)\n";
     }
diff --git a/lib/Target/SparcV9/RegAlloc/IGNode.cpp b/lib/Target/SparcV9/RegAlloc/IGNode.cpp
index 795e8b71524..c8fca7a23b6 100644
--- a/lib/Target/SparcV9/RegAlloc/IGNode.cpp
+++ b/lib/Target/SparcV9/RegAlloc/IGNode.cpp
@@ -1,3 +1,9 @@
+//===-- IGNode.cpp -------------------------------------------------------===//
+// 
+//  class IGNode for coloring-based register allocation for LLVM.
+// 
+//===----------------------------------------------------------------------===//
+
 #include "llvm/CodeGen/IGNode.h"
 #include <algorithm>
 #include <iostream>
diff --git a/lib/Target/SparcV9/RegAlloc/InterferenceGraph.cpp b/lib/Target/SparcV9/RegAlloc/InterferenceGraph.cpp
index 412f35fe932..217077eaa31 100644
--- a/lib/Target/SparcV9/RegAlloc/InterferenceGraph.cpp
+++ b/lib/Target/SparcV9/RegAlloc/InterferenceGraph.cpp
@@ -1,6 +1,12 @@
+//===-- InterferenceGraph.cpp ---------------------------------------------===//
+// 
+//  Interference graph for coloring-based register allocation for LLVM.
+// 
+//===----------------------------------------------------------------------===//
+
 #include "llvm/CodeGen/InterferenceGraph.h"
-#include "Support/STLExtras.h"
 #include "llvm/CodeGen/RegAllocCommon.h"
+#include "Support/STLExtras.h"
 #include <algorithm>
 using std::cerr;
 
@@ -14,7 +20,7 @@ InterferenceGraph::InterferenceGraph(RegClass *const RC) : RegCl(RC),
 {   
   IG = NULL;         
   Size = 0;            
-  if( DEBUG_RA) {
+  if( DEBUG_RA >= RA_DEBUG_Interference) {
     cerr << "Interference graph created!\n";
   }
 }
@@ -76,17 +82,15 @@ void InterferenceGraph::setInterference(const LiveRange *const LR1,
   IGNode *const IGNode1 = LR1->getUserIGNode();
   IGNode *const IGNode2 = LR2->getUserIGNode();
 
-  if( DEBUG_RA) {
-    assertIGNode( IGNode1 );   
-    assertIGNode( IGNode2 );
-  }
+  assertIGNode( IGNode1 );   
+  assertIGNode( IGNode2 );
   
   const unsigned int row = IGNode1->getIndex();
   const unsigned int col = IGNode2->getIndex();
 
   char *val;
 
-  if( DEBUG_RA > 1) 
+  if( DEBUG_RA >= RA_DEBUG_Interference > 1) 
     cerr << "setting intf for: [" << row << "][" <<  col << "]\n"; 
 
   ( row > col) ?  val = &IG[row][col]: val = &IG[col][row]; 
@@ -107,11 +111,8 @@ unsigned InterferenceGraph::getInterference(const LiveRange *const LR1,
 					   const LiveRange *const LR2 ) const {
 
   assert(LR1 != LR2);
-
-  if( DEBUG_RA) {
-    assertIGNode( LR1->getUserIGNode() );  
-    assertIGNode( LR2->getUserIGNode() );
-  }
+  assertIGNode( LR1->getUserIGNode() );  
+  assertIGNode( LR2->getUserIGNode() );
 
   const unsigned int row = LR1->getUserIGNode()->getIndex();
   const unsigned int col = LR2->getUserIGNode()->getIndex();
@@ -144,7 +145,7 @@ void InterferenceGraph::mergeIGNodesOfLRs(const LiveRange *LR1,
   assertIGNode( DestNode );
   assertIGNode( SrcNode );
 
-  if( DEBUG_RA > 1) {
+  if( DEBUG_RA >= RA_DEBUG_Interference > 1) {
     cerr << "Merging LRs: \""; printSet(*LR1); 
     cerr << "\" and \""; printSet(*LR2);
     cerr << "\"\n";
diff --git a/lib/Target/SparcV9/RegAlloc/LiveRangeInfo.cpp b/lib/Target/SparcV9/RegAlloc/LiveRangeInfo.cpp
index 6a992b1ee35..7ad70186663 100644
--- a/lib/Target/SparcV9/RegAlloc/LiveRangeInfo.cpp
+++ b/lib/Target/SparcV9/RegAlloc/LiveRangeInfo.cpp
@@ -1,4 +1,11 @@
+//===-- LiveRangeInfo.cpp -------------------------------------------------===//
+// 
+//  Live range construction for coloring-based register allocation for LLVM.
+// 
+//===----------------------------------------------------------------------===//
+
 #include "llvm/CodeGen/LiveRangeInfo.h"
+#include "llvm/CodeGen/RegAllocCommon.h"
 #include "llvm/CodeGen/RegClass.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineCodeForBasicBlock.h"
@@ -6,7 +13,6 @@
 #include "llvm/Function.h"
 #include "llvm/BasicBlock.h"
 #include "Support/SetOperations.h"
-#include "llvm/CodeGen/RegAllocCommon.h"
 using std::cerr;
 
 LiveRangeInfo::LiveRangeInfo(const Function *F, const TargetMachine &tm,
@@ -80,8 +86,8 @@ void LiveRangeInfo::unionAndUpdateLRs(LiveRange *L1, LiveRange *L2) {
 //---------------------------------------------------------------------------
 void LiveRangeInfo::constructLiveRanges() {  
 
-  if (DEBUG_RA) 
-    cerr << "Consturcting Live Ranges ...\n";
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) 
+    cerr << "Constructing Live Ranges ...\n";
 
   // first find the live ranges for all incoming args of the function since
   // those LRs start from the start of the function
@@ -97,8 +103,8 @@ void LiveRangeInfo::constructLiveRanges() {
     ArgRange->setRegClass(RegClassList[rcid]);
 
     			   
-    if( DEBUG_RA > 1)
-      cerr << " adding LiveRange for argument " << RAV(AI) << "\n";
+    if( DEBUG_RA >= RA_DEBUG_LiveRanges)
+      cerr << " Adding LiveRange for argument " << RAV(AI) << "\n";
   }
 
   // Now suggest hardware registers for these function args 
@@ -133,7 +139,7 @@ void LiveRangeInfo::constructLiveRanges() {
       // iterate over  MI operands to find defs
       for (MachineInstr::val_op_iterator OpI = MInst->begin(),
              OpE = MInst->end(); OpI != OpE; ++OpI) {
-	if(DEBUG_RA) {
+	if(DEBUG_RA >= RA_DEBUG_LiveRanges) {
 	  MachineOperand::MachineOperandType OpTyp = 
 	    OpI.getMachineOperand().getOperandType();
 
@@ -161,7 +167,7 @@ void LiveRangeInfo::constructLiveRanges() {
 	    DefRange->insert(Def);          // add the instruction (def) to it
 	    LiveRangeMap[ Def ] = DefRange; // update the map
 
-	    if (DEBUG_RA > 1)
+	    if (DEBUG_RA >= RA_DEBUG_LiveRanges)
 	      cerr << "  creating a LR for def: " << RAV(Def) << "\n";
 
 	    // set the register class of the new live range
@@ -174,7 +180,7 @@ void LiveRangeInfo::constructLiveRanges() {
 			    OpI.getMachineOperand().getVRegValue(), isCC );
 
 
-	    if (isCC && DEBUG_RA)
+	    if (isCC && DEBUG_RA >= RA_DEBUG_LiveRanges)
 	      cerr  << "\a**created a LR for a CC reg:"
                     << RAV(OpI.getMachineOperand().getVRegValue());
 
@@ -185,9 +191,8 @@ void LiveRangeInfo::constructLiveRanges() {
 	                                    // to the merged set
 	    LiveRangeMap[Def] = DefRange; 
 
-	    if (DEBUG_RA > 1)
-	      cerr << "   added to an existing LR for def: "
-                   << RAV(Def) << "\n";
+	    if (DEBUG_RA >= RA_DEBUG_LiveRanges)
+	      cerr << "   Added to existing LR for def: " << RAV(Def) << "\n";
 	  }
 
 	} // if isDef()
@@ -205,7 +210,7 @@ void LiveRangeInfo::constructLiveRanges() {
 
   suggestRegs4CallRets();
 
-  if( DEBUG_RA) 
+  if( DEBUG_RA >= RA_DEBUG_LiveRanges) 
     cerr << "Initial Live Ranges constructed!\n";
 
 }
@@ -260,8 +265,8 @@ void LiveRangeInfo::suggestRegs4CallRets()
 //---------------------------------------------------------------------------
 void LiveRangeInfo::coalesceLRs()  
 {
-  if(DEBUG_RA) 
-    cerr << "\nCoalscing LRs ...\n";
+  if(DEBUG_RA >= RA_DEBUG_LiveRanges) 
+    cerr << "\nCoalescing LRs ...\n";
 
   for(Function::const_iterator BBI = Meth->begin(), BBE = Meth->end();
       BBI != BBE; ++BBI) {
@@ -275,7 +280,7 @@ void LiveRangeInfo::coalesceLRs()
       
       const MachineInstr * MInst = *MInstIterator; 
 
-      if( DEBUG_RA > 1) {
+      if( DEBUG_RA >= RA_DEBUG_LiveRanges) {
 	cerr << " *Iterating over machine instr ";
 	MInst->dump();
 	cerr << "\n";
@@ -296,7 +301,7 @@ void LiveRangeInfo::coalesceLRs()
  	    LiveRange *LROfUse = getLiveRangeForValue( *UseI );
 	    if (!LROfUse) {             // if LR of use is not found
 	      //don't warn about labels
-	      if (!isa<BasicBlock>(*UseI) && DEBUG_RA)
+	      if (!isa<BasicBlock>(*UseI) && DEBUG_RA >= RA_DEBUG_LiveRanges)
 		cerr << " !! Warning: No LR for use " << RAV(*UseI) << "\n";
 	      continue;                 // ignore and continue
 	    }
@@ -331,8 +336,8 @@ void LiveRangeInfo::coalesceLRs()
     } // for all machine instructions
   } // for all BBs
 
-  if (DEBUG_RA) 
-    cerr << "\nCoalscing Done!\n";
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) 
+    cerr << "\nCoalescing Done!\n";
 }
 
 
@@ -347,8 +352,9 @@ void LiveRangeInfo::printLiveRanges() {
   cerr << "\nPrinting Live Ranges from Hash Map:\n";
   for( ; HMI != LiveRangeMap.end(); ++HMI) {
     if (HMI->first && HMI->second) {
-      cerr << " " << RAV(HMI->first) << "\t: "; 
-      printSet(*HMI->second); cerr << "\n";
+      cerr << " Value* " << RAV(HMI->first) << "\t: "; 
+      cerr << "LR# " << HMI->second->getUserIGNode()->getIndex();
+      cerr << "\t:Values = "; printSet(*HMI->second); cerr << "\n";
     }
   }
 }
diff --git a/lib/Target/SparcV9/RegAlloc/Makefile b/lib/Target/SparcV9/RegAlloc/Makefile
index f2b4aa8a9d1..aa70f5ab16f 100644
--- a/lib/Target/SparcV9/RegAlloc/Makefile
+++ b/lib/Target/SparcV9/RegAlloc/Makefile
@@ -4,4 +4,6 @@ DIRS  =
 
 LIBRARYNAME = regalloc
 
+BUILD_ARCHIVE = 1
+
 include $(LEVEL)/Makefile.common
diff --git a/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.cpp b/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.cpp
index 415c7989989..9faa9cbcad7 100644
--- a/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.cpp
+++ b/lib/Target/SparcV9/RegAlloc/PhyRegAlloc.cpp
@@ -5,6 +5,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/CodeGen/RegisterAllocation.h"
+#include "llvm/CodeGen/RegAllocCommon.h"
 #include "llvm/CodeGen/PhyRegAlloc.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineInstrAnnot.h"
@@ -17,24 +18,25 @@
 #include "llvm/Function.h"
 #include "llvm/Type.h"
 #include "llvm/iOther.h"
-#include "llvm/CodeGen/RegAllocCommon.h"
-#include "Support/CommandLine.h"
 #include "Support/STLExtras.h"
 #include <math.h>
 using std::cerr;
 using std::vector;
 
 RegAllocDebugLevel_t DEBUG_RA;
+
 static cl::opt<RegAllocDebugLevel_t, true>
 DRA_opt("dregalloc", cl::Hidden, cl::location(DEBUG_RA),
         cl::desc("enable register allocation debugging information"),
         cl::values(
-  clEnumValN(RA_DEBUG_None   , "n", "disable debug output"),
-  clEnumValN(RA_DEBUG_Normal , "y", "enable debug output"),
-  clEnumValN(RA_DEBUG_Verbose, "v", "enable extra debug output"),
+  clEnumValN(RA_DEBUG_None   ,     "n", "disable debug output"),
+  clEnumValN(RA_DEBUG_Results,     "y", "debug output for allocation results"),
+  clEnumValN(RA_DEBUG_Coloring,    "c", "debug output for graph coloring step"),
+  clEnumValN(RA_DEBUG_Interference,"ig","debug output for interference graphs"),
+  clEnumValN(RA_DEBUG_LiveRanges , "lr","debug output for live ranges"),
+  clEnumValN(RA_DEBUG_Verbose,     "v", "extra debug output"),
                    0));
 
-
 //----------------------------------------------------------------------------
 // RegisterAllocation pass front end...
 //----------------------------------------------------------------------------
@@ -104,7 +106,7 @@ PhyRegAlloc::~PhyRegAlloc() {
 // and IGNodeList (one in each IG). The actual nodes will be pushed later. 
 //----------------------------------------------------------------------------
 void PhyRegAlloc::createIGNodeListsAndIGs() {
-  if (DEBUG_RA) cerr << "Creating LR lists ...\n";
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) cerr << "Creating LR lists ...\n";
 
   // hash map iterator
   LiveRangeMapType::const_iterator HMI = LRI.getLiveRangeMap()->begin();   
@@ -116,18 +118,16 @@ void PhyRegAlloc::createIGNodeListsAndIGs() {
     if (HMI->first) { 
       LiveRange *L = HMI->second;   // get the LiveRange
       if (!L) { 
-        if (DEBUG_RA) {
-          cerr << "\n*?!?Warning: Null liver range found for: "
-               << RAV(HMI->first) << "\n";
-        }
+        if (DEBUG_RA)
+          cerr << "\n**** ?!?WARNING: NULL LIVE RANGE FOUND FOR: "
+               << RAV(HMI->first) << "****\n";
         continue;
       }
-                                        // if the Value * is not null, and LR  
-                                        // is not yet written to the IGNodeList
+
+      // if the Value * is not null, and LR is not yet written to the IGNodeList
       if (!(L->getUserIGNode())  ) {  
         RegClass *const RC =           // RegClass of first value in the LR
           RegClassList[ L->getRegClass()->getID() ];
-        
         RC->addLRToIG(L);              // add this LR to an IG
       }
     }
@@ -137,19 +137,17 @@ void PhyRegAlloc::createIGNodeListsAndIGs() {
   for ( unsigned rc=0; rc < NumOfRegClasses ; rc++)  
     RegClassList[rc]->createInterferenceGraph();
 
-  if (DEBUG_RA)
-    cerr << "LRLists Created!\n";
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) cerr << "LRLists Created!\n";
 }
 
 
-
-
 //----------------------------------------------------------------------------
 // This method will add all interferences at for a given instruction.
 // Interence occurs only if the LR of Def (Inst or Arg) is of the same reg 
 // class as that of live var. The live var passed to this function is the 
 // LVset AFTER the instruction
 //----------------------------------------------------------------------------
+
 void PhyRegAlloc::addInterference(const Value *Def, 
 				  const ValueSet *LVSet,
 				  bool isCallInst) {
@@ -173,26 +171,16 @@ void PhyRegAlloc::addInterference(const Value *Def,
       cerr << "< Def=" << RAV(Def) << ", Lvar=" << RAV(*LIt) << "> ";
 
     //  get the live range corresponding to live var
-    //
+    // 
     LiveRange *LROfVar = LRI.getLiveRangeForValue(*LIt);
 
     // LROfVar can be null if it is a const since a const 
     // doesn't have a dominating def - see Assumptions above
     //
-    if (LROfVar) {  
-      if (LROfDef == LROfVar)            // do not set interf for same LR
-	continue;
-
-      // if 2 reg classes are the same set interference
-      //
-      if (RCOfDef == LROfVar->getRegClass()) {
-	RCOfDef->setInterference( LROfDef, LROfVar);  
-      } else if (DEBUG_RA >= RA_DEBUG_Verbose)  { 
-        // we will not have LRs for values not explicitly allocated in the
-        // instruction stream (e.g., constants)
-        cerr << " warning: no live range for " << RAV(*LIt) << "\n";
-      }
-    }
+    if (LROfVar)
+      if (LROfDef != LROfVar)                  // do not set interf for same LR
+        if (RCOfDef == LROfVar->getRegClass()) // 2 reg classes are the same
+          RCOfDef->setInterference( LROfDef, LROfVar);  
   }
 }
 
@@ -208,7 +196,7 @@ void PhyRegAlloc::addInterference(const Value *Def,
 void PhyRegAlloc::setCallInterferences(const MachineInstr *MInst, 
 				       const ValueSet *LVSetAft) {
 
-  if (DEBUG_RA)
+  if (DEBUG_RA >= RA_DEBUG_Interference)
     cerr << "\n For call inst: " << *MInst;
 
   ValueSet::const_iterator LIt = LVSetAft->begin();
@@ -221,18 +209,17 @@ void PhyRegAlloc::setCallInterferences(const MachineInstr *MInst,
     //
     LiveRange *const LR = LRI.getLiveRangeForValue(*LIt ); 
 
-    if (LR && DEBUG_RA) {
-      cerr << "\n\tLR Aft Call: ";
-      printSet(*LR);
-    }
-   
     // LR can be null if it is a const since a const 
     // doesn't have a dominating def - see Assumptions above
     //
-    if (LR )   {  
+    if (LR ) {  
+      if (DEBUG_RA >= RA_DEBUG_Interference) {
+        cerr << "\n\tLR after Call: ";
+        printSet(*LR);
+      }
       LR->setCallInterference();
-      if (DEBUG_RA) {
-	cerr << "\n  ++Added call interf for LR: " ;
+      if (DEBUG_RA >= RA_DEBUG_Interference) {
+	cerr << "\n  ++After adding call interference for LR: " ;
 	printSet(*LR);
       }
     }
@@ -274,7 +261,8 @@ void PhyRegAlloc::setCallInterferences(const MachineInstr *MInst,
 void PhyRegAlloc::buildInterferenceGraphs()
 {
 
-  if (DEBUG_RA) cerr << "Creating interference graphs ...\n";
+  if (DEBUG_RA >= RA_DEBUG_Interference)
+    cerr << "Creating interference graphs ...\n";
 
   unsigned BBLoopDepthCost;
   for (Function::const_iterator BBI = Meth->begin(), BBE = Meth->end();
@@ -351,9 +339,8 @@ void PhyRegAlloc::buildInterferenceGraphs()
   //  
   addInterferencesForArgs();          
 
-  if (DEBUG_RA)
-    cerr << "Interference graphs calculted!\n";
-
+  if (DEBUG_RA >= RA_DEBUG_Interference)
+    cerr << "Interference graphs calculated!\n";
 }
 
 
@@ -403,15 +390,16 @@ void PhyRegAlloc::addInterf4PseudoInstr(const MachineInstr *MInst) {
 //----------------------------------------------------------------------------
 // This method will add interferences for incoming arguments to a function.
 //----------------------------------------------------------------------------
+
 void PhyRegAlloc::addInterferencesForArgs() {
   // get the InSet of root BB
   const ValueSet &InSet = LVI->getInSetOfBB(&Meth->front());  
 
-  for (Function::const_aiterator AI = Meth->abegin(); AI != Meth->aend(); ++AI) {
+  for (Function::const_aiterator AI=Meth->abegin(); AI != Meth->aend(); ++AI) {
     // add interferences between args and LVars at start 
     addInterference(AI, &InSet, false);
     
-    if (DEBUG_RA >= RA_DEBUG_Verbose)
+    if (DEBUG_RA >= RA_DEBUG_Interference)
       cerr << " - %% adding interference for  argument " << RAV(AI) << "\n";
   }
 }
@@ -442,8 +430,8 @@ PrependInstructions(vector<MachineInstr *> &IBef,
       for (AdIt = IBef.begin(); AdIt != IBef.end() ; ++AdIt)
         {
           if (DEBUG_RA) {
-            if (OrigMI) cerr << "For MInst: " << *OrigMI;
-            cerr << msg << " PREPENDed instr: " << **AdIt << "\n";
+            if (OrigMI) cerr << "For MInst:\n  " << *OrigMI;
+            cerr << msg << "PREPENDed instr:\n  " << **AdIt << "\n";
           }
           MII = MIVec.insert(MII, *AdIt);
           ++MII;
@@ -464,8 +452,8 @@ AppendInstructions(std::vector<MachineInstr *> &IAft,
       for ( AdIt = IAft.begin(); AdIt != IAft.end() ; ++AdIt )
         {
           if (DEBUG_RA) {
-            if (OrigMI) cerr << "For MInst: " << *OrigMI;
-            cerr << msg << " APPENDed instr: "  << **AdIt << "\n";
+            if (OrigMI) cerr << "For MInst:\n  " << *OrigMI;
+            cerr << msg << "APPENDed instr:\n  "  << **AdIt << "\n";
           }
           ++MII;    // insert before the next instruction
           MII = MIVec.insert(MII, *AdIt);
@@ -674,9 +662,9 @@ void PhyRegAlloc::insertCode4SpilledLR(const LiveRange *LR,
   AI.InstrnsAfter.insert(AI.InstrnsAfter.begin(), MIAft.begin(), MIAft.end());
   
   if (DEBUG_RA) {
-    cerr << "\nFor Inst " << *MInst;
-    cerr << " - SPILLED LR: "; printSet(*LR);
-    cerr << "\n - Added Instructions:";
+    cerr << "\nFor Inst:\n  " << *MInst;
+    cerr << "SPILLED LR# " << LR->getUserIGNode()->getIndex();
+    cerr << "; added Instructions:";
     for_each(MIBef.begin(), MIBef.end(), std::mem_fun(&MachineInstr::dump));
     for_each(MIAft.begin(), MIAft.end(), std::mem_fun(&MachineInstr::dump));
   }
@@ -1015,8 +1003,6 @@ void PhyRegAlloc::printLabel(const Value *const Val) {
 
 void PhyRegAlloc::markUnusableSugColors()
 {
-  if (DEBUG_RA ) cerr << "\nmarking unusable suggested colors ...\n";
-
   // hash map iterator
   LiveRangeMapType::const_iterator HMI = (LRI.getLiveRangeMap())->begin();   
   LiveRangeMapType::const_iterator HMIEnd = (LRI.getLiveRangeMap())->end();   
@@ -1048,7 +1034,7 @@ void PhyRegAlloc::markUnusableSugColors()
 //----------------------------------------------------------------------------
 
 void PhyRegAlloc::allocateStackSpace4SpilledLRs() {
-  if (DEBUG_RA) cerr << "\nsetting LR stack offsets ...\n";
+  if (DEBUG_RA) cerr << "\nSetting LR stack offsets for spills...\n";
 
   LiveRangeMapType::const_iterator HMI    = LRI.getLiveRangeMap()->begin();   
   LiveRangeMapType::const_iterator HMIEnd = LRI.getLiveRangeMap()->end();   
@@ -1056,8 +1042,13 @@ void PhyRegAlloc::allocateStackSpace4SpilledLRs() {
   for ( ; HMI != HMIEnd ; ++HMI) {
     if (HMI->first && HMI->second) {
       LiveRange *L = HMI->second;      // get the LiveRange
-      if (!L->hasColor())   //  NOTE: ** allocating the size of long Type **
-        L->setSpillOffFromFP(mcInfo.allocateSpilledValue(TM, Type::LongTy));
+      if (!L->hasColor()) {   //  NOTE: ** allocating the size of long Type **
+        int stackOffset = mcInfo.allocateSpilledValue(TM, Type::LongTy);
+        L->setSpillOffFromFP(stackOffset);
+        if (DEBUG_RA)
+          cerr << "  LR# " << L->getUserIGNode()->getIndex()
+               << ": stack-offset = " << stackOffset << "\n";
+      }
     }
   } // for all LR's in hash map
 }
@@ -1077,7 +1068,7 @@ void PhyRegAlloc::allocateRegisters()
   //
   LRI.constructLiveRanges();            // create LR info
 
-  if (DEBUG_RA)
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges)
     LRI.printLiveRanges();
   
   createIGNodeListsAndIGs();            // create IGNode list and IGs
@@ -1085,7 +1076,7 @@ void PhyRegAlloc::allocateRegisters()
   buildInterferenceGraphs();            // build IGs in all reg classes
   
   
-  if (DEBUG_RA) {
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) {
     // print all LRs in all reg classes
     for ( unsigned rc=0; rc < NumOfRegClasses  ; rc++)  
       RegClassList[rc]->printIGNodeList(); 
@@ -1099,7 +1090,7 @@ void PhyRegAlloc::allocateRegisters()
   LRI.coalesceLRs();                    // coalesce all live ranges
   
 
-  if (DEBUG_RA) {
+  if (DEBUG_RA >= RA_DEBUG_LiveRanges) {
     // print all LRs in all reg classes
     for ( unsigned rc=0; rc < NumOfRegClasses  ; rc++)  
       RegClassList[ rc ]->printIGNodeList(); 
@@ -1139,8 +1130,8 @@ void PhyRegAlloc::allocateRegisters()
   updateMachineCode(); 
 
   if (DEBUG_RA) {
+    cerr << "\n**** Machine Code After Register Allocation:\n\n";
     MachineCodeForMethod::get(Meth).dump();
-    printMachineCode();                   // only for DEBUGGING
   }
 }
 
diff --git a/lib/Target/SparcV9/RegAlloc/RegClass.cpp b/lib/Target/SparcV9/RegAlloc/RegClass.cpp
index 5998f1fd664..b92b70997ba 100644
--- a/lib/Target/SparcV9/RegAlloc/RegClass.cpp
+++ b/lib/Target/SparcV9/RegAlloc/RegClass.cpp
@@ -1,3 +1,9 @@
+//===-- RegClass.cpp -----------------------------------------------------===//
+// 
+//  class RegClass for coloring-based register allocation for LLVM.
+// 
+//===----------------------------------------------------------------------===//
+
 #include "llvm/CodeGen/RegClass.h"
 #include "llvm/CodeGen/RegAllocCommon.h"
 using std::cerr;
@@ -11,7 +17,7 @@ RegClass::RegClass(const Function *M,
 		   const ReservedColorListType *RCL)
                   :  Meth(M), MRC(Mrc), RegClassID( Mrc->getRegClassID() ),
                      IG(this), IGNodeStack(), ReservedColorList(RCL) {
-  if( DEBUG_RA)
+  if( DEBUG_RA >= RA_DEBUG_Interference)
     cerr << "Created Reg Class: " << RegClassID << "\n";
 
   IsColorUsedArr.resize(Mrc->getNumOfAllRegs());
@@ -24,7 +30,8 @@ RegClass::RegClass(const Function *M,
 //----------------------------------------------------------------------------
 void RegClass::colorAllRegs()
 {
-  if(DEBUG_RA) cerr << "Coloring IG of reg class " << RegClassID << " ...\n";
+  if(DEBUG_RA >= RA_DEBUG_Coloring)
+    cerr << "Coloring IG of reg class " << RegClassID << " ...\n";
 
                                         // pre-color IGNodes
   pushAllIGNodes();                     // push all IG Nodes
@@ -57,7 +64,7 @@ void RegClass::pushAllIGNodes()
                                         // push non-constrained IGNodes
   bool PushedAll  = pushUnconstrainedIGNodes(); 
 
-  if( DEBUG_RA) {
+  if( DEBUG_RA >= RA_DEBUG_Coloring) {
     cerr << " Puhsed all-unconstrained IGNodes. ";
     if( PushedAll ) cerr << " No constrained nodes left.";
     cerr << "\n";
@@ -88,7 +95,7 @@ void RegClass::pushAllIGNodes()
     //
     NeedMoreSpills = !pushUnconstrainedIGNodes(); 
 
-    if (DEBUG_RA)
+    if (DEBUG_RA >= RA_DEBUG_Coloring)
       cerr << "\nConstrained IG Node found !@!" << IGNodeSpill->getIndex();
 
   } while(NeedMoreSpills);            // repeat until we have pushed all 
@@ -129,7 +136,7 @@ bool  RegClass::pushUnconstrainedIGNodes()
       IGNodeStack.push( IGNode );       // push IGNode on to the stack
       IGNode->pushOnStack();            // set OnStack and dec deg of neighs
 
-      if (DEBUG_RA > 1) {
+      if (DEBUG_RA >= RA_DEBUG_Coloring) {
 	cerr << " pushed un-constrained IGNode " << IGNode->getIndex() ;
 	cerr << " on to stack\n";
       }
@@ -230,7 +237,7 @@ void RegClass::colorIGNode(IGNode *const Node)
     MRC->colorIGNode(Node, IsColorUsedArr);
   }
   else {
-    if( DEBUG_RA ) {
+    if( DEBUG_RA >= RA_DEBUG_Coloring) {
       cerr << " Node " << Node->getIndex();
       cerr << " already colored with color " << Node->getColor() << "\n";
     }
@@ -238,7 +245,7 @@ void RegClass::colorIGNode(IGNode *const Node)
 
 
   if( !Node->hasColor() ) {
-    if( DEBUG_RA ) {
+    if( DEBUG_RA >= RA_DEBUG_Coloring) {
       cerr << " Node " << Node->getIndex();
       cerr << " - could not find a color (needs spilling)\n";
     }