Vendor import of llvm release_30 branch r142614:

http://llvm.org/svn/llvm-project/llvm/branches/release_30@142614

1 files changed, 55 insertions, 0 deletions

diff --git a/include/llvm/Analysis/BlockFrequencyInfo.h b/include/llvm/Analysis/BlockFrequencyInfo.h
new file mode 100644
index 0000000..9e698a9
--- /dev/null
+++ b/include/llvm/Analysis/BlockFrequencyInfo.h
@@ -0,0 +1,55 @@
+//========-------- BlockFrequencyInfo.h - Block 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_ANALYSIS_BLOCKFREQUENCYINFO_H
+#define LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H
+
+#include "llvm/Pass.h"
+#include "llvm/Support/BlockFrequency.h"
+#include <climits>
+
+namespace llvm {
+
+class BranchProbabilityInfo;
+template<class BlockT, class FunctionT, class BranchProbInfoT>
+class BlockFrequencyImpl;
+
+/// BlockFrequencyInfo pass uses BlockFrequencyImpl implementation to estimate
+/// IR basic block frequencies.
+class BlockFrequencyInfo : public FunctionPass {
+
+  BlockFrequencyImpl<BasicBlock, Function, BranchProbabilityInfo> *BFI;
+
+public:
+  static char ID;
+
+  BlockFrequencyInfo();
+
+  ~BlockFrequencyInfo();
+
+  void getAnalysisUsage(AnalysisUsage &AU) const;
+
+  bool runOnFunction(Function &F);
+  void print(raw_ostream &O, const Module *M) const;
+
+  /// 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(BasicBlock *BB) const;
+};
+
+}
+
+#endif