From e30ed53c0525c4e7ff7b76087c4c3ef3749fd844 Mon Sep 17 00:00:00 2001
From: David Goodwin <david_goodwin@apple.com>
Date: Wed, 28 Oct 2009 18:29:54 +0000
Subject: Make AntiDepReg.h internal.

llvm-svn: 85412
---
 llvm/lib/CodeGen/AntiDepBreaker.h | 62 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 llvm/lib/CodeGen/AntiDepBreaker.h

(limited to 'llvm/lib/CodeGen/AntiDepBreaker.h')

diff --git a/llvm/lib/CodeGen/AntiDepBreaker.h b/llvm/lib/CodeGen/AntiDepBreaker.h
new file mode 100644
index 00000000000..dac700076a8
--- /dev/null
+++ b/llvm/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
-- 
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