4 files changed, 65 insertions, 3 deletions
diff --git a/lib/CodeGen/AggressiveAntiDepBreaker.h b/lib/CodeGen/AggressiveAntiDepBreaker.h
index f4a05290c0..abda1365ef 100644
--- a/lib/CodeGen/AggressiveAntiDepBreaker.h
+++ b/lib/CodeGen/AggressiveAntiDepBreaker.h
@@ -17,7 +17,7 @@
 #ifndef LLVM_CODEGEN_AGGRESSIVEANTIDEPBREAKER_H
 #define LLVM_CODEGEN_AGGRESSIVEANTIDEPBREAKER_H
 
-#include "llvm/CodeGen/AntiDepBreaker.h"
+#include "AntiDepBreaker.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
diff --git a/lib/CodeGen/AntiDepBreaker.h b/lib/CodeGen/AntiDepBreaker.h
new file mode 100644
index 0000000000..dac700076a
--- /dev/null
+++ b/lib/CodeGen/AntiDepBreaker.h
@@ -0,0 +1,62 @@
+//=- llvm/CodeGen/AntiDepBreaker.h - Anti-Dependence Breaking -*- C++ -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the AntiDepBreaker class, which implements
+// anti-dependence breaking heuristics for post-register-allocation scheduling.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_ANTIDEPBREAKER_H
+#define LLVM_CODEGEN_ANTIDEPBREAKER_H
+
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/ScheduleDAG.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+
+namespace llvm {
+
+/// AntiDepBreaker - This class works into conjunction with the
+/// post-RA scheduler to rename registers to break register
+/// anti-dependencies.
+class AntiDepBreaker {
+public:
+  virtual ~AntiDepBreaker();
+
+  /// GetMaxTrials - Return the maximum number of anti-dependence
+  /// breaking attempts that will be made for a block.
+  virtual unsigned GetMaxTrials() =0;
+
+  /// Start - Initialize anti-dep breaking for a new basic block.
+  virtual void StartBlock(MachineBasicBlock *BB) =0;
+
+  /// BreakAntiDependencies - Identifiy anti-dependencies within a
+  /// basic-block region and break them by renaming registers. Return
+  /// the number of anti-dependencies broken.
+  ///
+  virtual unsigned BreakAntiDependencies(std::vector<SUnit>& SUnits,
+                                         MachineBasicBlock::iterator& Begin,
+                                         MachineBasicBlock::iterator& End,
+                                         unsigned InsertPosIndex) =0;
+  
+  /// Observe - Update liveness information to account for the current
+  /// instruction, which will not be scheduled.
+  ///
+  virtual void Observe(MachineInstr *MI, unsigned Count,
+                       unsigned InsertPosIndex) =0;
+  
+  /// Finish - Finish anti-dep breaking for a basic block.
+  virtual void FinishBlock() =0;
+};
+
+}
+
+#endif
diff --git a/lib/CodeGen/CriticalAntiDepBreaker.h b/lib/CodeGen/CriticalAntiDepBreaker.h
index 700851c297..ea7c73ce36 100644
--- a/lib/CodeGen/CriticalAntiDepBreaker.h
+++ b/lib/CodeGen/CriticalAntiDepBreaker.h
@@ -16,7 +16,7 @@
 #ifndef LLVM_CODEGEN_CRITICALANTIDEPBREAKER_H
 #define LLVM_CODEGEN_CRITICALANTIDEPBREAKER_H
 
-#include "llvm/CodeGen/AntiDepBreaker.h"
+#include "AntiDepBreaker.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
diff --git a/lib/CodeGen/PostRASchedulerList.cpp b/lib/CodeGen/PostRASchedulerList.cpp
index c3cae8a4be..96146e97e0 100644
--- a/lib/CodeGen/PostRASchedulerList.cpp
+++ b/lib/CodeGen/PostRASchedulerList.cpp
@@ -19,12 +19,12 @@
 //===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "post-RA-sched"
+#include "AntiDepBreaker.h"
 #include "AggressiveAntiDepBreaker.h"
 #include "CriticalAntiDepBreaker.h"
 #include "ExactHazardRecognizer.h"
 #include "SimpleHazardRecognizer.h"
 #include "ScheduleDAGInstrs.h"
-#include "llvm/CodeGen/AntiDepBreaker.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/LatencyPriorityQueue.h"
 #include "llvm/CodeGen/SchedulerRegistry.h"