--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/Support/BranchProbability.cpp	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,36 @@
+//===-------------- lib/Support/BranchProbability.cpp -----------*- 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 Branch Probability class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/BranchProbability.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+void BranchProbability::print(raw_ostream &OS) const {
+  OS << N << " / " << D << " = " << format("%g%%", ((double)N / D) * 100.0);
+}
+
+void BranchProbability::dump() const {
+  dbgs() << *this << '\n';
+}
+
+namespace llvm {
+
+raw_ostream &operator<<(raw_ostream &OS, const BranchProbability &Prob) {
+  Prob.print(OS);
+  return OS;
+}
+
+}