Add DebugLoc-aware constructors for SDNode derived

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

diff --git a/include/llvm/CodeGen/LiveVariables.h b/include/llvm/CodeGen/LiveVariables.h
index f6bc83162eafc8496b7b29affae06873b8e27443..bb050f260368dbf344ea7fbff4519c9b6214724e 100644 (file)
--- a/include/llvm/CodeGen/LiveVariables.h
+++ b/include/llvm/CodeGen/LiveVariables.h
@@ -32,7 +32,6 @@
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/SmallVector.h"
 
 namespace llvm {
@@ -51,13 +50,16 @@ public:
   /// throughout, the set of blocks in which the instruction is actually used,
   /// and the set of non-phi instructions that are the last users of the value.
   ///
-  /// If the value is live throughout any blocks, these blocks are listed in
-  /// AliveBlocks.  Blocks where the liveness range ends are not included in
-  /// AliveBlocks, instead being captured by the Kills set.  In these blocks,
-  /// the value is live into the block (unless the value is defined and killed
-  /// in the same block) and lives until the specified instruction.  Note that
-  /// there cannot ever be a value whose Kills set contains two instructions
-  /// from the same basic block.
+  /// In the common case where a value is defined and killed in the same block,
+  /// There is one killing instruction, and AliveBlocks is empty.
+  ///
+  /// Otherwise, the value is live out of the block.  If the value is live
+  /// throughout any blocks, these blocks are listed in AliveBlocks.  Blocks
+  /// where the liveness range ends are not included in AliveBlocks, instead
+  /// being captured by the Kills set.  In these blocks, the value is live into
+  /// the block (unless the value is defined and killed in the same block) and
+  /// lives until the specified instruction.  Note that there cannot ever be a
+  /// value whose Kills set contains two instructions from the same basic block.
   ///
   /// PHI nodes complicate things a bit.  If a PHI node is the last user of a
   /// value in one of its predecessor blocks, it is not listed in the kills set,
@@ -144,7 +146,7 @@ private:   // Intermediate data structures
   /// HandlePhysRegKill - Add kills of Reg and its sub-registers to the
   /// uses. Pay special attention to the sub-register uses which may come below
   /// the last use of the whole register.
-  bool HandlePhysRegKill(unsigned Reg);
+  bool HandlePhysRegKill(unsigned Reg, MachineInstr *MI);
 
   void HandlePhysRegUse(unsigned Reg, MachineInstr *MI);
   void HandlePhysRegDef(unsigned Reg, MachineInstr *MI);