--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/Target/X86/X86MacroFusion.h	Fri Oct 27 17:07:41 2017 +0900
@@ -0,0 +1,25 @@
+//===- X86MacroFusion.h - X86 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 X86 definition of the DAG scheduling mutation
+///  to pair instructions back to back.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/MachineScheduler.h"
+
+namespace llvm {
+
+/// Note that you have to add:
+///   DAG.addMutation(createX86MacroFusionDAGMutation());
+/// to X86PassConfig::createMachineScheduler() to have an effect.
+std::unique_ptr<ScheduleDAGMutation>
+createX86MacroFusionDAGMutation();
+
+} // end namespace llvm