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diff --git a/clang-r353983/include/llvm/CodeGen/GlobalISel/CombinerHelper.h b/clang-r353983/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
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+++ b/clang-r353983/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
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+//===-- llvm/CodeGen/GlobalISel/CombinerHelper.h --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===--------------------------------------------------------------------===//
+//
+/// This contains common combine transformations that may be used in a combine
+/// pass,or by the target elsewhere.
+/// Targets can pick individual opcode transformations from the helper or use
+/// tryCombine which invokes all transformations. All of the transformations
+/// return true if the MachineInstruction changed and false otherwise.
+//
+//===--------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_GLOBALISEL_COMBINER_HELPER_H
+#define LLVM_CODEGEN_GLOBALISEL_COMBINER_HELPER_H
+
+namespace llvm {
+
+class GISelChangeObserver;
+class MachineIRBuilder;
+class MachineRegisterInfo;
+class MachineInstr;
+class MachineOperand;
+
+class CombinerHelper {
+  MachineIRBuilder &Builder;
+  MachineRegisterInfo &MRI;
+  GISelChangeObserver &Observer;
+
+public:
+  CombinerHelper(GISelChangeObserver &Observer, MachineIRBuilder &B);
+
+  /// MachineRegisterInfo::replaceRegWith() and inform the observer of the changes
+  void replaceRegWith(MachineRegisterInfo &MRI, unsigned FromReg, unsigned ToReg) const;
+
+  /// Replace a single register operand with a new register and inform the
+  /// observer of the changes.
+  void replaceRegOpWith(MachineRegisterInfo &MRI, MachineOperand &FromRegOp,
+                        unsigned ToReg) const;
+
+  /// If \p MI is COPY, try to combine it.
+  /// Returns true if MI changed.
+  bool tryCombineCopy(MachineInstr &MI);
+
+  /// If \p MI is extend that consumes the result of a load, try to combine it.
+  /// Returns true if MI changed.
+  bool tryCombineExtendingLoads(MachineInstr &MI);
+
+  /// Try to transform \p MI by using all of the above
+  /// combine functions. Returns true if changed.
+  bool tryCombine(MachineInstr &MI);
+};
+} // namespace llvm
+
+#endif