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 6e7e23d495b8d131b4bfce767765a2aa7e5b17ae..d98ad347354de0bc73241a79a2db1aa2b77de64e 100644 (file)
--- a/include/llvm/CodeGen/LiveVariables.h
+++ b/include/llvm/CodeGen/LiveVariables.h
@@ -36,6 +36,7 @@
 namespace llvm {
 
 class MRegisterInfo;
+class BitVector;
 
 class LiveVariables : public MachineFunctionPass {
 public:
@@ -78,6 +79,10 @@ public:
     ///
     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.
     ///
@@ -108,13 +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.
   ///
-  BitVector AllocatablePhysicalRegisters;
+  BitVector ReservedRegisters;
 
 private:   // Intermediate data structures
+  MachineFunction *MF;
+
   const MRegisterInfo *RegInfo;
 
   MachineInstr **PhysRegInfo;