Aggressively prune the DFS when inserting phi-defs.

[oota-llvm.git] / include / llvm / Target / TargetFrameInfo.h

diff --git a/include/llvm/Target/TargetFrameInfo.h b/include/llvm/Target/TargetFrameInfo.h
index afc3fb140c915ebac16854d629147d144d5c1774..975d15659c15f1c6730036ce744262ab5dad0625 100644 (file)
--- a/include/llvm/Target/TargetFrameInfo.h
+++ b/include/llvm/Target/TargetFrameInfo.h
@@ -31,6 +31,12 @@ public:
     StackGrowsUp,        // Adding to the stack increases the stack address
     StackGrowsDown       // Adding to the stack decreases the stack address
   };
+
+  // Maps a callee saved register to a stack slot with a fixed offset.
+  struct SpillSlot {
+    unsigned Reg;
+    int Offset; // Offset relative to stack pointer on function entry.
+  };
 private:
   StackDirection StackDir;
   unsigned StackAlignment;
@@ -76,10 +82,10 @@ public:
   ///
   /// Each entry in this array contains a <register,offset> pair, indicating the
   /// fixed offset from the incoming stack pointer that each register should be
-  /// spilled at.  If a register is not listed here, the code generator is
+  /// spilled at. If a register is not listed here, the code generator is
   /// allowed to spill it anywhere it chooses.
   ///
-  virtual const std::pair<unsigned, int> *
+  virtual const SpillSlot *
   getCalleeSavedSpillSlots(unsigned &NumEntries) const {
     NumEntries = 0;
     return 0;