Subzero. Moar performance tweaks.

src/IceLiveness.h

 //===- subzero/src/IceLiveness.h - Liveness analysis ------------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// \brief Declares the Liveness and LivenessNode classes, which are used for
 /// liveness analysis.
 ///
 /// The node-specific information tracked for each Variable includes whether it
 /// is live on entry, whether it is live on exit, the instruction number that
 /// starts its live range, and the instruction number that ends its live range.
 /// At the Cfg level, the actual live intervals are recorded.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICELIVENESS_H
 #define SUBZERO_SRC_ICELIVENESS_H
 
+#include "IceDefs.h"
+#include "IceBitVector.h"
 #include "IceCfgNode.h"
-#include "IceDefs.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
 class Liveness {
   Liveness() = delete;
   Liveness(const Liveness &) = delete;
   Liveness &operator=(const Liveness &) = delete;
 
   class LivenessNode {
@@ skipping 74 matching lines @@
   /// Size of Nodes is Cfg::Nodes.size().
   CfgVector<LivenessNode> Nodes;
   /// VarToLiveMap maps a Variable's Variable::Number to its live index within
   /// its basic block.
   CfgVector<SizeT> VarToLiveMap;
   /// LiveToVarMap is analogous to LivenessNode::LiveToVarMap, but for non-local
   /// variables.
   CfgVector<Variable *> LiveToVarMap;
   /// RangeMask[Variable::Number] indicates whether we want to track that
   /// Variable's live range.
-  llvm::BitVector RangeMask;
+  LivenessBV RangeMask;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICELIVENESS_H