Subzero: Add a few performance measurement tools.

src/IceCfg.h

 //===- subzero/src/IceCfg.h - Control flow graph ----------------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the Cfg class, which represents the control flow
@@ skipping 78 matching lines @@
   TargetLowering *getTarget() const { return Target.get(); }
   VariablesMetadata *getVMetadata() const { return VMetadata.get(); }
   Liveness *getLiveness() const { return Live.get(); }
   template <typename T> T *getAssembler() const {
     return static_cast<T *>(TargetAssembler.get());
   }
   bool UseIntegratedAssembler() const {
     return getContext()->getFlags().UseIntegratedAssembler;
   }
   bool hasComputedFrame() const;
+  bool getFocusedTiming() const { return FocusedTiming; }
+  void setFocusedTiming() { FocusedTiming = true; }
 
   // Passes over the CFG.
   void translate();
   // After the CFG is fully constructed, iterate over the nodes and
   // compute the predecessor edges, in the form of
   // CfgNode::InEdges[].
   void computePredecessors();
   void renumberInstructions();
   void placePhiLoads();
   void placePhiStores();
@@ skipping 49 matching lines @@
   // order to use a "Recycler" to preserve memory. If we keep all allocation
   // requests from the Cfg exposed via methods, we can always switch the
   // implementation over at a later point.
   llvm::BumpPtrAllocator Allocator;
 
   GlobalContext *Ctx;
   IceString FunctionName;
   Type ReturnType;
   bool IsInternalLinkage;
   bool HasError;
+  bool FocusedTiming;
   IceString ErrorMessage;
   CfgNode *Entry; // entry basic block
   NodeList Nodes; // linearized node list; Entry should be first
   InstNumberT NextInstNumber;
   VarList Variables;
   VarList Args; // subset of Variables, in argument order
   VarList ImplicitArgs; // subset of Variables
   std::unique_ptr<Liveness> Live;
   std::unique_ptr<TargetLowering> Target;
   std::unique_ptr<VariablesMetadata> VMetadata;
   std::unique_ptr<Assembler> TargetAssembler;
 
   // CurrentNode is maintained during dumping/emitting just for
   // validating Variable::DefNode.  Normally, a traversal over
   // CfgNodes maintains this, but before global operations like
   // register allocation, resetCurrentNode() should be called to avoid
   // spurious validation failures.
   const CfgNode *CurrentNode;
 
   Cfg(const Cfg &) = delete;
   Cfg &operator=(const Cfg &) = delete;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFG_H