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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
-/// This file 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
+/// This file 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 "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 {
     LivenessNode &operator=(const LivenessNode &) = delete;
 
   public:
     LivenessNode() = default;
     LivenessNode(const LivenessNode &) = default;
     /// NumLocals is the number of Variables local to this block.
     SizeT NumLocals = 0;
     /// NumNonDeadPhis tracks the number of Phi instructions that
-    /// Inst::liveness() identified as tentatively live.  If
-    /// NumNonDeadPhis changes from the last liveness pass, then liveness
-    /// has not yet converged.
+    /// Inst::liveness() identified as tentatively live. If NumNonDeadPhis
+    /// changes from the last liveness pass, then liveness has not yet
+    /// converged.
     SizeT NumNonDeadPhis = 0;
-    // LiveToVarMap maps a liveness bitvector index to a Variable.  This
-    // is generally just for printing/dumping.  The index should be less
-    // than NumLocals + Liveness::NumGlobals.
+    // LiveToVarMap maps a liveness bitvector index to a Variable. This is
+    // generally just for printing/dumping. The index should be less than
+    // NumLocals + Liveness::NumGlobals.
     std::vector<Variable *> LiveToVarMap;
     // LiveIn and LiveOut track the in- and out-liveness of the global
-    // variables.  The size of each vector is
-    // LivenessNode::NumGlobals.
+    // variables. The size of each vector is LivenessNode::NumGlobals.
     LivenessBV LiveIn, LiveOut;
-    // LiveBegin and LiveEnd track the instruction numbers of the start
-    // and end of each variable's live range within this block.  The
-    // index/key of each element is less than NumLocals +
-    // Liveness::NumGlobals.
+    // LiveBegin and LiveEnd track the instruction numbers of the start and end
+    // of each variable's live range within this block. The index/key of each
+    // element is less than NumLocals + Liveness::NumGlobals.
     LiveBeginEndMap LiveBegin, LiveEnd;
   };
 
 public:
   Liveness(Cfg *Func, LivenessMode Mode) : Func(Func), Mode(Mode) {}
   void init();
   void initPhiEdgeSplits(NodeList::const_iterator FirstNode,
                          VarList::const_iterator FirstVar);
   Cfg *getFunc() const { return Func; }
   LivenessMode getMode() const { return Mode; }
@@ skipping 34 matching lines @@
   /// Resize Nodes so that Nodes[Index] is valid.
   void resize(SizeT Index) {
     if (Index >= Nodes.size())
       Nodes.resize(Index + 1);
   }
   Cfg *Func;
   LivenessMode Mode;
   SizeT NumGlobals = 0;
   /// Size of Nodes is Cfg::Nodes.size().
   std::vector<LivenessNode> Nodes;
-  /// VarToLiveMap maps a Variable's Variable::Number to its live index
-  /// within its basic block.
+  /// VarToLiveMap maps a Variable's Variable::Number to its live index within
+  /// its basic block.
   std::vector<SizeT> VarToLiveMap;
-  /// LiveToVarMap is analogous to LivenessNode::LiveToVarMap, but for
-  /// non-local variables.
+  /// LiveToVarMap is analogous to LivenessNode::LiveToVarMap, but for non-local
+  /// variables.
   std::vector<Variable *> LiveToVarMap;
   /// RangeMask[Variable::Number] indicates whether we want to track that
   /// Variable's live range.
   llvm::BitVector RangeMask;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICELIVENESS_H