Fix comment.

[oota-llvm.git] / include / llvm / CodeGen / LiveVariables.h

diff --git a/include/llvm/CodeGen/LiveVariables.h b/include/llvm/CodeGen/LiveVariables.h
index 47801a94722dc1b49e03bb346a762d155fc7d415..d98ad347354de0bc73241a79a2db1aa2b77de64e 100644 (file)
--- a/include/llvm/CodeGen/LiveVariables.h
+++ b/include/llvm/CodeGen/LiveVariables.h
@@ -30,11 +30,13 @@
 #define LLVM_CODEGEN_LIVEVARIABLES_H
 
 #include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/ADT/BitVector.h"
 #include <map>
 
 namespace llvm {
 
 class MRegisterInfo;
+class BitVector;
 
 class LiveVariables : public MachineFunctionPass {
 public:
@@ -75,7 +77,11 @@ public:
     /// through.  This is a bit set which uses the basic block number as an
     /// index.
     ///
-    std::vector<bool> AliveBlocks;
+    BitVector AliveBlocks;
+
+    /// UsedBlocks - Set of blocks of which this value is actually used. This
+    /// is a bit set which uses the basic block number as an index.
+    BitVector UsedBlocks;
 
     /// Kills - List of MachineInstruction's which are the last use of this
     /// virtual register (kill it) in their basic block.
@@ -107,13 +113,15 @@ private:
   ///
   std::vector<VarInfo> VirtRegInfo;
 
-  /// AllocatablePhysicalRegisters - This vector keeps track of which registers
-  /// are actually register allocatable by the target machine.  We can not track
-  /// liveness for values that are not in this set.
+  /// ReservedRegisters - This vector keeps track of which registers
+  /// are reserved register which are not allocatable by the target machine.
+  /// We can not track liveness for values that are in this set.
   ///
-  std::vector<bool> AllocatablePhysicalRegisters;
+  BitVector ReservedRegisters;
 
 private:   // Intermediate data structures
+  MachineFunction *MF;
+
   const MRegisterInfo *RegInfo;
 
   MachineInstr **PhysRegInfo;