X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FSpillPlacement.h;h=03dd58d6e9a978a52f13d03f5eb2112af5b4d36e;hb=14fc08301c9d8d11e58b79fdaae9c68ceb4b22d4;hp=a88d7ac739144b2a19c278047cb4cc7d976868cc;hpb=9f998de8918c1dd5a8b8ec564af00107859898e0;p=oota-llvm.git

diff --git a/lib/CodeGen/SpillPlacement.h b/lib/CodeGen/SpillPlacement.h
index a88d7ac7391..03dd58d6e9a 100644
--- a/lib/CodeGen/SpillPlacement.h
+++ b/lib/CodeGen/SpillPlacement.h
@@ -24,8 +24,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CODEGEN_SPILLPLACEMENT_H
-#define LLVM_CODEGEN_SPILLPLACEMENT_H
+#ifndef LLVM_LIB_CODEGEN_SPILLPLACEMENT_H
+#define LLVM_LIB_CODEGEN_SPILLPLACEMENT_H
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
@@ -40,7 +40,7 @@ class MachineBasicBlock;
 class MachineLoopInfo;
 class MachineBlockFrequencyInfo;
 
-class SpillPlacement  : public MachineFunctionPass {
+class SpillPlacement : public MachineFunctionPass {
   struct Node;
   const MachineFunction *MF;
   const EdgeBundles *bundles;
@@ -60,13 +60,17 @@ class SpillPlacement  : public MachineFunctionPass {
   SmallVector<unsigned, 8> RecentPositive;
 
   // Block frequencies are computed once. Indexed by block number.
-  SmallVector<BlockFrequency, 4> BlockFrequencies;
+  SmallVector<BlockFrequency, 8> BlockFrequencies;
+
+  /// Decision threshold. A node gets the output value 0 if the weighted sum of
+  /// its inputs falls in the open interval (-Threshold;Threshold).
+  BlockFrequency Threshold;
 
 public:
   static char ID; // Pass identification, replacement for typeid.
 
-  SpillPlacement() : MachineFunctionPass(ID), nodes(0) {}
-  ~SpillPlacement() { releaseMemory(); }
+  SpillPlacement() : MachineFunctionPass(ID), nodes(nullptr) {}
+  ~SpillPlacement() override { releaseMemory(); }
 
   /// BorderConstraint - A basic block has separate constraints for entry and
   /// exit.
@@ -152,6 +156,7 @@ private:
   void releaseMemory() override;
 
   void activate(unsigned);
+  void setThreshold(const BlockFrequency &Entry);
 };
 
 } // end namespace llvm