initial

thirdparty/clang/include/llvm/CodeGen/MachineBlockFrequencyInfo.h

@@ -0,0 +1,56 @@
+//====----- MachineBlockFrequencyInfo.h - MachineBlock Frequency Analysis ----====//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Loops should be simplified before this analysis.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
+#define LLVM_CODEGEN_MACHINEBLOCKFREQUENCYINFO_H
+
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/Support/BlockFrequency.h"
+#include <climits>
+
+namespace llvm {
+
+class MachineBasicBlock;
+class MachineBranchProbabilityInfo;
+template<class BlockT, class FunctionT, class BranchProbInfoT>
+class BlockFrequencyImpl;
+
+/// MachineBlockFrequencyInfo pass uses BlockFrequencyImpl implementation to estimate
+/// machine basic block frequencies.
+class MachineBlockFrequencyInfo : public MachineFunctionPass {
+
+  BlockFrequencyImpl<MachineBasicBlock, MachineFunction,
+                     MachineBranchProbabilityInfo> *MBFI;
+
+public:
+  static char ID;
+
+  MachineBlockFrequencyInfo();
+
+  ~MachineBlockFrequencyInfo();
+
+  void getAnalysisUsage(AnalysisUsage &AU) const;
+
+  bool runOnMachineFunction(MachineFunction &F);
+
+  /// getblockFreq - Return block frequency. Return 0 if we don't have the
+  /// information. Please note that initial frequency is equal to 1024. It means
+  /// that we should not rely on the value itself, but only on the comparison to
+  /// the other block frequencies. We do this to avoid using of floating points.
+  ///
+  BlockFrequency getBlockFreq(const MachineBasicBlock *MBB) const;
+};
+
+}
+
+#endif