Subzero: Improve performance of liveness analysis and live range construction.

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 44 matching lines @@
   // Manage nodes (a.k.a. basic blocks, CfgNodes).
   void setEntryNode(CfgNode *EntryNode) { Entry = EntryNode; }
   CfgNode *getEntryNode() const { return Entry; }
   // Create a node and append it to the end of the linearized list.
   CfgNode *makeNode(const IceString &Name = "");
   SizeT getNumNodes() const { return Nodes.size(); }
   const NodeList &getNodes() const { return Nodes; }
 
   // Manage instruction numbering.
   InstNumberT newInstNumber() { return NextInstNumber++; }
+  InstNumberT getNextInstNumber() const { return NextInstNumber; }
 
   // Manage Variables.
   // Create a new Variable with a particular type and an optional
   // name.  The Node argument is the node where the variable is defined.
   template <typename T> T *makeVariable(Type Ty, const IceString &Name = "") {
     SizeT Index = Variables.size();
     T *Var = T::create(this, Ty, Index, Name);
     Variables.push_back(Var);
     return Var;
   }
@@ skipping 112 matching lines @@
   // spurious validation failures.
   const CfgNode *CurrentNode;
 
   Cfg(const Cfg &) = delete;
   Cfg &operator=(const Cfg &) = delete;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFG_H