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diff --git a/contrib/llvm/lib/Target/X86/X86MacroFusion.h b/contrib/llvm/lib/Target/X86/X86MacroFusion.h
new file mode 100644
index 000000000000..e630f802e8e6
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+++ b/contrib/llvm/lib/Target/X86/X86MacroFusion.h
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+//===- X86MacroFusion.h - X86 Macro Fusion --------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// \file This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the X86 definition of the DAG scheduling mutation to pair
+// instructions back to back.
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86InstrInfo.h"
+#include "llvm/CodeGen/MachineScheduler.h"
+
+//===----------------------------------------------------------------------===//
+// X86MacroFusion - DAG post-processing to encourage fusion of macro ops.
+//===----------------------------------------------------------------------===//
+
+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