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diff --git a/include/llvm/CodeGen/MacroFusion.h b/include/llvm/CodeGen/MacroFusion.h
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+++ b/include/llvm/CodeGen/MacroFusion.h
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+//===- MacroFusion.h - Macro Fusion ------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file This file contains the definition of the DAG scheduling mutation to
+/// pair instructions back to back.
+//
+//===----------------------------------------------------------------------===//
+
+#include <functional>
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/CodeGen/MachineScheduler.h"
+
+namespace llvm {
+
+/// \brief Check if the instr pair, FirstMI and SecondMI, should be fused
+/// together. Given SecondMI, when FirstMI is unspecified, then check if
+/// SecondMI may be part of a fused pair at all.
+typedef std::function<bool(const TargetInstrInfo &TII,
+                           const TargetSubtargetInfo &TSI,
+                           const MachineInstr *FirstMI,
+                           const MachineInstr &SecondMI)>  ShouldSchedulePredTy;
+
+/// \brief Create a DAG scheduling mutation to pair instructions back to back
+/// for instructions that benefit according to the target-specific
+/// shouldScheduleAdjacent predicate function.
+std::unique_ptr<ScheduleDAGMutation>
+createMacroFusionDAGMutation(ShouldSchedulePredTy shouldScheduleAdjacent);
+
+/// \brief Create a DAG scheduling mutation to pair branch instructions with one
+/// of their predecessors back to back for instructions that benefit according
+/// to the target-specific shouldScheduleAdjacent predicate function.
+std::unique_ptr<ScheduleDAGMutation>
+createBranchMacroFusionDAGMutation(ShouldSchedulePredTy shouldScheduleAdjacent);
+
+} // end namespace llvm