Massive check in. This changes the "-fast" flag to "-O#" in llc. If you want to

use the old behavior, the flag is -O0. This change allows for finer-grained
control over which optimizations are run at different -O levels.

Most of this work was pretty mechanical. The majority of the fixes came from
verifying that a "fast" variable wasn't used anymore. The JIT still uses a
"Fast" flag. I'm not 100% sure if it's necessary to change it there...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70270 91177308-0d34-0410-b5e6-96231b3b80d8

93 files changed, 394 insertions, 346 deletions

diff --git a/include/llvm/CodeGen/AsmPrinter.h b/include/llvm/CodeGen/AsmPrinter.h
index c1d86a2190..241a998925 100644
--- a/include/llvm/CodeGen/AsmPrinter.h
+++ b/include/llvm/CodeGen/AsmPrinter.h
@@ -65,8 +65,8 @@ namespace llvm {
     // Necessary for external weak linkage support
     std::set<const GlobalValue*> ExtWeakSymbols;
 
-    /// Fast - Generating code via fast instruction selection.
-    bool Fast;
+    /// OptLevel - Generating code at a specific optimization level.
+    unsigned OptLevel;
   public:
     /// Output stream on which we're printing assembly code.
     ///
@@ -110,8 +110,8 @@ namespace llvm {
     bool VerboseAsm;
 
   protected:
-    AsmPrinter(raw_ostream &o, TargetMachine &TM,
-               const TargetAsmInfo *T, bool F, bool V);
+    explicit AsmPrinter(raw_ostream &o, TargetMachine &TM,
+                        const TargetAsmInfo *T, unsigned OL, bool V);
     
   public:
     virtual ~AsmPrinter();
diff --git a/include/llvm/CodeGen/DwarfWriter.h b/include/llvm/CodeGen/DwarfWriter.h
index 4b35b288c9..5641407001 100644
--- a/include/llvm/CodeGen/DwarfWriter.h
+++ b/include/llvm/CodeGen/DwarfWriter.h
@@ -81,7 +81,7 @@ public:
   void EndFunction(MachineFunction *MF);
 
   /// ValidDebugInfo - Return true if V represents valid debug info value.
-  bool ValidDebugInfo(Value *V, bool FastISel);
+  bool ValidDebugInfo(Value *V, unsigned OptLevel);
 
   /// RecordSourceLine - Register a source line with debug info. Returns a
   /// unique label ID used to generate a label and provide correspondence to
diff --git a/include/llvm/CodeGen/LinkAllCodegenComponents.h b/include/llvm/CodeGen/LinkAllCodegenComponents.h
index 74026a4791..84d9819c2d 100644
--- a/include/llvm/CodeGen/LinkAllCodegenComponents.h
+++ b/include/llvm/CodeGen/LinkAllCodegenComponents.h
@@ -42,11 +42,11 @@ namespace {
       llvm::linkOcamlGC();
       llvm::linkShadowStackGC();
       
-      (void) llvm::createBURRListDAGScheduler(NULL, false);
-      (void) llvm::createTDRRListDAGScheduler(NULL, false);
-      (void) llvm::createTDListDAGScheduler(NULL, false);
-      (void) llvm::createFastDAGScheduler(NULL, false);
-      (void) llvm::createDefaultScheduler(NULL, false);
+      (void) llvm::createBURRListDAGScheduler(NULL, 3);
+      (void) llvm::createTDRRListDAGScheduler(NULL, 3);
+      (void) llvm::createTDListDAGScheduler(NULL, 3);
+      (void) llvm::createFastDAGScheduler(NULL, 3);
+      (void) llvm::createDefaultScheduler(NULL, 3);
 
     }
   } ForceCodegenLinking; // Force link by creating a global definition.
diff --git a/include/llvm/CodeGen/SchedulerRegistry.h b/include/llvm/CodeGen/SchedulerRegistry.h
index c967bfc446..e02dc7a392 100644
--- a/include/llvm/CodeGen/SchedulerRegistry.h
+++ b/include/llvm/CodeGen/SchedulerRegistry.h
@@ -32,7 +32,7 @@ class MachineBasicBlock;
 
 class RegisterScheduler : public MachinePassRegistryNode {
 public:
-  typedef ScheduleDAGSDNodes *(*FunctionPassCtor)(SelectionDAGISel*, bool);
+  typedef ScheduleDAGSDNodes *(*FunctionPassCtor)(SelectionDAGISel*, unsigned);
 
   static MachinePassRegistry Registry;
 
@@ -64,27 +64,27 @@ public:
 /// createBURRListDAGScheduler - This creates a bottom up register usage
 /// reduction list scheduler.
 ScheduleDAGSDNodes *createBURRListDAGScheduler(SelectionDAGISel *IS,
-                                               bool Fast);
+                                               unsigned OptLevel);
 
 /// createTDRRListDAGScheduler - This creates a top down register usage
 /// reduction list scheduler.
 ScheduleDAGSDNodes *createTDRRListDAGScheduler(SelectionDAGISel *IS,
-                                               bool Fast);
+                                               unsigned OptLevel);
 
 /// createTDListDAGScheduler - This creates a top-down list scheduler with
 /// a hazard recognizer.
 ScheduleDAGSDNodes *createTDListDAGScheduler(SelectionDAGISel *IS,
-                                             bool Fast);
+                                             unsigned OptLevel);
 
 /// createFastDAGScheduler - This creates a "fast" scheduler.
 ///
 ScheduleDAGSDNodes *createFastDAGScheduler(SelectionDAGISel *IS,
-                                           bool Fast);
+                                           unsigned OptLevel);
 
 /// createDefaultScheduler - This creates an instruction scheduler appropriate
 /// for the target.
 ScheduleDAGSDNodes *createDefaultScheduler(SelectionDAGISel *IS,
-                                           bool Fast);
+                                           unsigned OptLevel);
 
 } // end namespace llvm
 
diff --git a/include/llvm/CodeGen/SelectionDAG.h b/include/llvm/CodeGen/SelectionDAG.h
index a350d5fd93..d2d17cfa2e 100644
--- a/include/llvm/CodeGen/SelectionDAG.h
+++ b/include/llvm/CodeGen/SelectionDAG.h
@@ -202,7 +202,7 @@ public:
   /// certain types of nodes together, or eliminating superfluous nodes.  The
   /// Level argument controls whether Combine is allowed to produce nodes and
   /// types that are illegal on the target.
-  void Combine(CombineLevel Level, AliasAnalysis &AA, bool Fast);
+  void Combine(CombineLevel Level, AliasAnalysis &AA, unsigned OptLevel);
 
   /// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
   /// only uses types natively supported by the target.  Returns "true" if it
@@ -218,7 +218,7 @@ public:
   ///
   /// Note that this is an involved process that may invalidate pointers into
   /// the graph.
-  void Legalize(bool TypesNeedLegalizing, bool Fast);
+  void Legalize(bool TypesNeedLegalizing, unsigned OptLevel);
 
   /// RemoveDeadNodes - This method deletes all unreachable nodes in the
   /// SelectionDAG.
diff --git a/include/llvm/CodeGen/SelectionDAGISel.h b/include/llvm/CodeGen/SelectionDAGISel.h
index e6bf8d76f4..d8802c7d9d 100644
--- a/include/llvm/CodeGen/SelectionDAGISel.h
+++ b/include/llvm/CodeGen/SelectionDAGISel.h
@@ -51,10 +51,10 @@ public:
   MachineBasicBlock *BB;
   AliasAnalysis *AA;
   GCFunctionInfo *GFI;
-  bool Fast;
+  unsigned OptLevel;
   static char ID;
 
-  explicit SelectionDAGISel(TargetMachine &tm, bool fast = false);
+  explicit SelectionDAGISel(TargetMachine &tm, unsigned OL = 3);
   virtual ~SelectionDAGISel();
   
   TargetLowering &getTargetLowering() { return TLI; }
diff --git a/include/llvm/Target/TargetMachine.h b/include/llvm/Target/TargetMachine.h
index c4c0b0ec24..ba688b48de 100644
--- a/include/llvm/Target/TargetMachine.h
+++ b/include/llvm/Target/TargetMachine.h
@@ -213,7 +213,7 @@ public:
   virtual FileModel::Model addPassesToEmitFile(PassManagerBase &,
                                                raw_ostream &,
                                                CodeGenFileType,
-                                               bool /*Fast*/) {
+                                               unsigned /* OptLevel */) {
     return FileModel::None;
   }
 
@@ -222,7 +222,8 @@ public:
   /// used to finish up adding passes to emit the file, if necessary.
   ///
   virtual bool addPassesToEmitFileFinish(PassManagerBase &,
-                                         MachineCodeEmitter *, bool /*Fast*/) {
+                                         MachineCodeEmitter *,
+                                         unsigned /* OptLevel */) {
     return true;
   }
  
@@ -234,7 +235,7 @@ public:
   ///
   virtual bool addPassesToEmitMachineCode(PassManagerBase &,
                                           MachineCodeEmitter &,
-                                          bool /*Fast*/) {
+                                          unsigned /* OptLevel */) {
     return true;
   }
 
@@ -243,7 +244,8 @@ public:
   /// use this.
   virtual bool WantsWholeFile() const { return false; }
   virtual bool addPassesToEmitWholeFile(PassManager &, raw_ostream &,
-                                        CodeGenFileType, bool /*Fast*/) {
+                                        CodeGenFileType,
+                                        unsigned /* OptLevel */) {
     return true;
   }
 };
@@ -258,16 +260,16 @@ protected: // Can only create subclasses.
   /// addCommonCodeGenPasses - Add standard LLVM codegen passes used for
   /// both emitting to assembly files or machine code output.
   ///
-  bool addCommonCodeGenPasses(PassManagerBase &, bool /*Fast*/);
+  bool addCommonCodeGenPasses(PassManagerBase &, unsigned /* OptLevel */);
 
 public:
   
   /// addPassesToEmitFile - Add passes to the specified pass manager to get the
   /// specified file emitted.  Typically this will involve several steps of code
-  /// generation.  If Fast is set to true, the code generator should emit code
-  /// as fast as possible, though the generated code may be less efficient.
-  /// This method should return FileModel::Error if emission of this file type
-  /// is not supported.
+  /// generation.  If OptLevel is 0, the code generator should emit code as fast
+  /// as possible, though the generated code may be less efficient.  This method
+  /// should return FileModel::Error if emission of this file type is not
+  /// supported.
   ///
   /// The default implementation of this method adds components from the
   /// LLVM retargetable code generator, invoking the methods below to get
@@ -276,14 +278,15 @@ public:
   virtual FileModel::Model addPassesToEmitFile(PassManagerBase &PM,
                                                raw_ostream &Out,
                                                CodeGenFileType FileType,
-                                               bool Fast);
+                                               unsigned OptLevel);
   
   /// addPassesToEmitFileFinish - If the passes to emit the specified file had
   /// to be split up (e.g., to add an object writer pass), this method can be
   /// used to finish up adding passes to emit the file, if necessary.
   ///
   virtual bool addPassesToEmitFileFinish(PassManagerBase &PM,
-                                         MachineCodeEmitter *MCE, bool Fast);
+                                         MachineCodeEmitter *MCE,
+                                         unsigned OptLevel);
  
   /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
   /// get machine code emitted.  This uses a MachineCodeEmitter object to handle
@@ -292,21 +295,22 @@ public:
   /// not supported.
   ///
   virtual bool addPassesToEmitMachineCode(PassManagerBase &PM,
-                                          MachineCodeEmitter &MCE, bool Fast);
+                                          MachineCodeEmitter &MCE,
+                                          unsigned OptLevel);
   
   /// Target-Independent Code Generator Pass Configuration Options.
   
   /// addInstSelector - This method should add any "last minute" LLVM->LLVM
   /// passes, then install an instruction selector pass, which converts from
   /// LLVM code to machine instructions.
-  virtual bool addInstSelector(PassManagerBase &, bool /*Fast*/) {
+  virtual bool addInstSelector(PassManagerBase &, unsigned /* OptLevel */) {
     return true;
   }
 
   /// addPreRegAllocPasses - This method may be implemented by targets that want
   /// to run passes immediately before register allocation. This should return
   /// true if -print-machineinstrs should print after these passes.
-  virtual bool addPreRegAlloc(PassManagerBase &, bool /*Fast*/) {
+  virtual bool addPreRegAlloc(PassManagerBase &, unsigned /* OptLevel */) {
     return false;
   }