diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 226699b..1378f25 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -57,7 +57,7 @@
     SelectionDAG &DAG;
     const TargetLowering &TLI;
     CombineLevel Level;
-    unsigned OptLevel;
+    CodeGenOpt::Level OptLevel;
     bool LegalOperations;
     bool LegalTypes;
 
@@ -254,7 +254,7 @@
     }
 
 public:
-    DAGCombiner(SelectionDAG &D, AliasAnalysis &A, unsigned OL)
+    DAGCombiner(SelectionDAG &D, AliasAnalysis &A, CodeGenOpt::Level OL)
       : DAG(D),
         TLI(D.getTargetLoweringInfo()),
         Level(Unrestricted),
@@ -4784,7 +4784,7 @@
   SDValue Ptr   = LD->getBasePtr();
 
   // Try to infer better alignment information than the load already has.
-  if (OptLevel != 0 && LD->isUnindexed()) {
+  if (OptLevel != CodeGenOpt::None && LD->isUnindexed()) {
     if (unsigned Align = InferAlignment(Ptr, DAG)) {
       if (Align > LD->getAlignment())
         return DAG.getExtLoad(LD->getExtensionType(), N->getDebugLoc(),
@@ -4904,7 +4904,7 @@
   SDValue Ptr   = ST->getBasePtr();
 
   // Try to infer better alignment information than the store already has.
-  if (OptLevel != 0 && ST->isUnindexed()) {
+  if (OptLevel != CodeGenOpt::None && ST->isUnindexed()) {
     if (unsigned Align = InferAlignment(Ptr, DAG)) {
       if (Align > ST->getAlignment())
         return DAG.getTruncStore(Chain, N->getDebugLoc(), Value,
@@ -6093,7 +6093,7 @@
 // SelectionDAG::Combine - This is the entry point for the file.
 //
 void SelectionDAG::Combine(CombineLevel Level, AliasAnalysis &AA,
-                           unsigned OptLevel) {
+                           CodeGenOpt::Level OptLevel) {
   /// run - This is the main entry point to this class.
   ///
   DAGCombiner(*this, AA, OptLevel).Run(Level);
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index a7801eb..09ac586 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -327,7 +327,7 @@
   default: break;
   case Intrinsic::dbg_stoppoint: {
     DbgStopPointInst *SPI = cast<DbgStopPointInst>(I);
-    if (DW && DW->ValidDebugInfo(SPI->getContext(), 0)) {
+    if (DW && DW->ValidDebugInfo(SPI->getContext(), CodeGenOpt::None)) {
       DICompileUnit CU(cast<GlobalVariable>(SPI->getContext()));
       std::string Dir, FN;
       unsigned SrcFile = DW->getOrCreateSourceID(CU.getDirectory(Dir),
@@ -344,7 +344,7 @@
   }
   case Intrinsic::dbg_region_start: {
     DbgRegionStartInst *RSI = cast<DbgRegionStartInst>(I);
-    if (DW && DW->ValidDebugInfo(RSI->getContext(), 0)) {
+    if (DW && DW->ValidDebugInfo(RSI->getContext(), CodeGenOpt::None)) {
       unsigned ID = 
         DW->RecordRegionStart(cast<GlobalVariable>(RSI->getContext()));
       const TargetInstrDesc &II = TII.get(TargetInstrInfo::DBG_LABEL);
@@ -354,7 +354,7 @@
   }
   case Intrinsic::dbg_region_end: {
     DbgRegionEndInst *REI = cast<DbgRegionEndInst>(I);
-    if (DW && DW->ValidDebugInfo(REI->getContext(), 0)) {
+    if (DW && DW->ValidDebugInfo(REI->getContext(), CodeGenOpt::None)) {
      unsigned ID = 0;
      DISubprogram Subprogram(cast<GlobalVariable>(REI->getContext()));
      if (!Subprogram.isNull() && !Subprogram.describes(MF.getFunction())) {
@@ -380,7 +380,7 @@
     DbgFuncStartInst *FSI = cast<DbgFuncStartInst>(I);
     Value *SP = FSI->getSubprogram();
 
-    if (DW->ValidDebugInfo(SP, 0)) {
+    if (DW->ValidDebugInfo(SP, CodeGenOpt::None)) {
       // llvm.dbg.func.start implicitly defines a dbg_stoppoint which is what
       // (most?) gdb expects.
       DebugLoc PrevLoc = DL;
@@ -425,7 +425,7 @@
   case Intrinsic::dbg_declare: {
     DbgDeclareInst *DI = cast<DbgDeclareInst>(I);
     Value *Variable = DI->getVariable();
-    if (DW && DW->ValidDebugInfo(Variable, 0)) {
+    if (DW && DW->ValidDebugInfo(Variable, CodeGenOpt::None)) {
       // Determine the address of the declared object.
       Value *Address = DI->getAddress();
       if (BitCastInst *BCI = dyn_cast<BitCastInst>(Address))
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index efa62be..9c43065 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -55,7 +55,7 @@
 class VISIBILITY_HIDDEN SelectionDAGLegalize {
   TargetLowering &TLI;
   SelectionDAG &DAG;
-  unsigned OptLevel;
+  CodeGenOpt::Level OptLevel;
   bool TypesNeedLegalizing;
 
   // Libcall insertion helpers.
@@ -139,7 +139,7 @@
 
 public:
   explicit SelectionDAGLegalize(SelectionDAG &DAG, bool TypesNeedLegalizing,
-                                unsigned ol);
+                                CodeGenOpt::Level ol);
 
   /// getTypeAction - Return how we should legalize values of this type, either
   /// it is already legal or we need to expand it into multiple registers of
@@ -350,7 +350,7 @@
 }
 
 SelectionDAGLegalize::SelectionDAGLegalize(SelectionDAG &dag,
-                                           bool types, unsigned ol)
+                                           bool types, CodeGenOpt::Level ol)
   : TLI(dag.getTargetLoweringInfo()), DAG(dag), OptLevel(ol),
     TypesNeedLegalizing(types), ValueTypeActions(TLI.getValueTypeActions()) {
   assert(MVT::LAST_VALUETYPE <= 32 &&
@@ -1276,7 +1276,7 @@
         unsigned Line = DSP->getLine();
         unsigned Col = DSP->getColumn();
 
-        if (OptLevel == 0) {
+        if (OptLevel == CodeGenOpt::None) {
           // A bit self-referential to have DebugLoc on Debug_Loc nodes, but it
           // won't hurt anything.
           if (useDEBUG_LOC) {
@@ -8571,7 +8571,8 @@
 
 // SelectionDAG::Legalize - This is the entry point for the file.
 //
-void SelectionDAG::Legalize(bool TypesNeedLegalizing, unsigned OptLevel) {
+void SelectionDAG::Legalize(bool TypesNeedLegalizing,
+                            CodeGenOpt::Level OptLevel) {
   /// run - This is the main entry point to this class.
   ///
   SelectionDAGLegalize(*this, TypesNeedLegalizing, OptLevel).LegalizeDAG();
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
index c87820a..af73b28 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
@@ -630,6 +630,6 @@
 //===----------------------------------------------------------------------===//
 
 llvm::ScheduleDAGSDNodes *
-llvm::createFastDAGScheduler(SelectionDAGISel *IS, unsigned) {
+llvm::createFastDAGScheduler(SelectionDAGISel *IS, CodeGenOpt::Level) {
   return new ScheduleDAGFast(*IS->MF);
 }
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp
index 2ac934a..c432534 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp
@@ -261,7 +261,7 @@
 /// new hazard recognizer. This scheduler takes ownership of the hazard
 /// recognizer and deletes it when done.
 ScheduleDAGSDNodes *
-llvm::createTDListDAGScheduler(SelectionDAGISel *IS, unsigned) {
+llvm::createTDListDAGScheduler(SelectionDAGISel *IS, CodeGenOpt::Level) {
   return new ScheduleDAGList(*IS->MF,
                              new LatencyPriorityQueue(),
                              IS->CreateTargetHazardRecognizer());
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index aecd02a..c97e2a8 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -1505,7 +1505,7 @@
 //===----------------------------------------------------------------------===//
 
 llvm::ScheduleDAGSDNodes *
-llvm::createBURRListDAGScheduler(SelectionDAGISel *IS, unsigned) {
+llvm::createBURRListDAGScheduler(SelectionDAGISel *IS, CodeGenOpt::Level) {
   const TargetMachine &TM = IS->TM;
   const TargetInstrInfo *TII = TM.getInstrInfo();
   const TargetRegisterInfo *TRI = TM.getRegisterInfo();
@@ -1519,7 +1519,7 @@
 }
 
 llvm::ScheduleDAGSDNodes *
-llvm::createTDRRListDAGScheduler(SelectionDAGISel *IS, unsigned) {
+llvm::createTDRRListDAGScheduler(SelectionDAGISel *IS, CodeGenOpt::Level) {
   const TargetMachine &TM = IS->TM;
   const TargetInstrInfo *TII = TM.getInstrInfo();
   const TargetRegisterInfo *TRI = TM.getRegisterInfo();
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index afadd62..01d73b3 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -45,7 +45,6 @@
 #include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/Target/TargetIntrinsicInfo.h"
 #include "llvm/Target/TargetLowering.h"
-#include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/CommandLine.h"
@@ -335,7 +334,8 @@
             DwarfWriter *DW = DAG.getDwarfWriter();
             DbgStopPointInst *SPI = cast<DbgStopPointInst>(I);
 
-            if (DW && DW->ValidDebugInfo(SPI->getContext(), false)) {
+            if (DW && DW->ValidDebugInfo(SPI->getContext(),
+                                         CodeGenOpt::Default)) {
               DICompileUnit CU(cast<GlobalVariable>(SPI->getContext()));
               std::string Dir, FN;
               unsigned SrcFile = DW->getOrCreateSourceID(CU.getDirectory(Dir),
@@ -354,7 +354,7 @@
               DbgFuncStartInst *FSI = cast<DbgFuncStartInst>(I);
               Value *SP = FSI->getSubprogram();
 
-              if (DW->ValidDebugInfo(SP, false)) {
+              if (DW->ValidDebugInfo(SP, CodeGenOpt::Default)) {
                 DISubprogram Subprogram(cast<GlobalVariable>(SP));
                 DICompileUnit CU(Subprogram.getCompileUnit());
                 std::string Dir, FN;
@@ -3899,7 +3899,7 @@
     DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
     if (DW && DW->ValidDebugInfo(SPI.getContext(), OptLevel)) {
       MachineFunction &MF = DAG.getMachineFunction();
-      if (OptLevel == 0)
+      if (OptLevel == CodeGenOpt::None)
         DAG.setRoot(DAG.getDbgStopPoint(getRoot(),
                                         SPI.getLine(),
                                         SPI.getColumn(),
@@ -3940,7 +3940,7 @@
           && strcmp(SPName.c_str(), MF.getFunction()->getNameStart())) {
           // This is end of inlined function. Debugging information for
           // inlined function is not handled yet (only supported by FastISel).
-        if (OptLevel == 0) {
+        if (OptLevel == CodeGenOpt::None) {
           unsigned ID = DW->RecordInlinedFnEnd(Subprogram);
           if (ID != 0)
             // Returned ID is 0 if this is unbalanced "end of inlined
@@ -3968,7 +3968,7 @@
     Value *SP = FSI.getSubprogram();
     if (SP && DW->ValidDebugInfo(SP, OptLevel)) {
       MachineFunction &MF = DAG.getMachineFunction();
-      if (OptLevel == 0) {
+      if (OptLevel == CodeGenOpt::None) {
         // llvm.dbg.func.start implicitly defines a dbg_stoppoint which is what
         // (most?) gdb expects.
         DebugLoc PrevLoc = CurDebugLoc;
@@ -4039,7 +4039,7 @@
     return 0;
   }
   case Intrinsic::dbg_declare: {
-    if (OptLevel == 0) {
+    if (OptLevel == CodeGenOpt::None) {
       DwarfWriter *DW = DAG.getDwarfWriter();
       DbgDeclareInst &DI = cast<DbgDeclareInst>(I);
       Value *Variable = DI.getVariable();
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.h b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.h
index 773f339..578aa591 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.h
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.h
@@ -23,6 +23,7 @@
 #include "llvm/CodeGen/SelectionDAGNodes.h"
 #include "llvm/CodeGen/ValueTypes.h"
 #include "llvm/Support/CallSite.h"
+#include "llvm/Target/TargetMachine.h"
 #include <vector>
 #include <set>
 
@@ -357,13 +358,14 @@
 
   /// OptLevel - What optimization level we're generating code for.
   /// 
-  unsigned OptLevel;
+  CodeGenOpt::Level OptLevel;
   
   /// GFI - Garbage collection metadata for the function.
   GCFunctionInfo *GFI;
 
   SelectionDAGLowering(SelectionDAG &dag, TargetLowering &tli,
-                       FunctionLoweringInfo &funcinfo, unsigned ol)
+                       FunctionLoweringInfo &funcinfo,
+                       CodeGenOpt::Level ol)
     : CurDebugLoc(DebugLoc::getUnknownLoc()), 
       TLI(tli), DAG(dag), FuncInfo(funcinfo), OptLevel(ol) {
   }
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 37087ec..4c934cd 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -136,10 +136,10 @@
   /// createDefaultScheduler - This creates an instruction scheduler appropriate
   /// for the target.
   ScheduleDAGSDNodes* createDefaultScheduler(SelectionDAGISel *IS,
-                                             unsigned OptLevel) {
+                                             CodeGenOpt::Level OptLevel) {
     const TargetLowering &TLI = IS->getTargetLowering();
 
-    if (OptLevel == 0)
+    if (OptLevel == CodeGenOpt::None)
       return createFastDAGScheduler(IS, OptLevel);
     if (TLI.getSchedulingPreference() == TargetLowering::SchedulingForLatency)
       return createTDListDAGScheduler(IS, OptLevel);
@@ -262,7 +262,7 @@
 // SelectionDAGISel code
 //===----------------------------------------------------------------------===//
 
-SelectionDAGISel::SelectionDAGISel(TargetMachine &tm, unsigned OL) :
+SelectionDAGISel::SelectionDAGISel(TargetMachine &tm, CodeGenOpt::Level OL) :
   FunctionPass(&ID), TM(tm), TLI(*tm.getTargetLowering()),
   FuncInfo(new FunctionLoweringInfo(TLI)),
   CurDAG(new SelectionDAG(TLI, *FuncInfo)),
@@ -645,7 +645,7 @@
 
   if (ViewISelDAGs) CurDAG->viewGraph("isel input for " + BlockName);
   
-  if (OptLevel != 0)
+  if (OptLevel != CodeGenOpt::None)
     ComputeLiveOutVRegInfo();
 
   // Third, instruction select all of the operations to machine code, adding the