Vendor import of llvm trunk r135360:

http://llvm.org/svn/llvm-project/llvm/trunk@135360

1 files changed, 53 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/MachineBlockFrequency.h b/include/llvm/CodeGen/MachineBlockFrequency.h
new file mode 100644
index 0000000..25bf1f0
--- /dev/null
+++ b/include/llvm/CodeGen/MachineBlockFrequency.h
@@ -0,0 +1,53 @@
+//====----- MachineBlockFrequency.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_MACHINEBLOCKFREQUENCY_H
+#define LLVM_CODEGEN_MACHINEBLOCKFREQUENCY_H
+
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include <climits>
+
+namespace llvm {
+
+class MachineBranchProbabilityInfo;
+template<class BlockT, class FunctionT, class BranchProbInfoT>
+class BlockFrequencyImpl;
+
+/// MachineBlockFrequency pass uses BlockFrequencyImpl implementation to estimate
+/// machine basic block frequencies.
+class MachineBlockFrequency : public MachineFunctionPass {
+
+  BlockFrequencyImpl<MachineBasicBlock, MachineFunction, MachineBranchProbabilityInfo> *MBFI;
+
+public:
+  static char ID;
+
+  MachineBlockFrequency();
+
+  ~MachineBlockFrequency();
+
+  void getAnalysisUsage(AnalysisUsage &AU) const;
+
+  bool runOnMachineFunction(MachineFunction &F);
+
+  /// getblockFreq - Return block frequency. Never return 0, value must be
+  /// positive. 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 the floating
+  /// points.
+  uint32_t getBlockFreq(MachineBasicBlock *MBB);
+};
+
+}
+
+#endif