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diff --git a/llvm/include/llvm/CodeGen/MachineCombinerPattern.h b/llvm/include/llvm/CodeGen/MachineCombinerPattern.h
new file mode 100644
index 000000000000..503227222207
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+++ b/llvm/include/llvm/CodeGen/MachineCombinerPattern.h
@@ -0,0 +1,107 @@
+//===-- llvm/CodeGen/MachineCombinerPattern.h - Instruction pattern supported by
+// combiner  ------*- 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 file defines instruction pattern supported by combiner
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_MACHINECOMBINERPATTERN_H
+#define LLVM_CODEGEN_MACHINECOMBINERPATTERN_H
+
+namespace llvm {
+
+/// These are instruction patterns matched by the machine combiner pass.
+enum class MachineCombinerPattern {
+  // These are commutative variants for reassociating a computation chain. See
+  // the comments before getMachineCombinerPatterns() in TargetInstrInfo.cpp.
+  REASSOC_AX_BY,
+  REASSOC_AX_YB,
+  REASSOC_XA_BY,
+  REASSOC_XA_YB,
+
+  // These are multiply-add patterns matched by the AArch64 machine combiner.
+  MULADDW_OP1,
+  MULADDW_OP2,
+  MULSUBW_OP1,
+  MULSUBW_OP2,
+  MULADDWI_OP1,
+  MULSUBWI_OP1,
+  MULADDX_OP1,
+  MULADDX_OP2,
+  MULSUBX_OP1,
+  MULSUBX_OP2,
+  MULADDXI_OP1,
+  MULSUBXI_OP1,
+  // Floating Point
+  FMULADDH_OP1,
+  FMULADDH_OP2,
+  FMULSUBH_OP1,
+  FMULSUBH_OP2,
+  FMULADDS_OP1,
+  FMULADDS_OP2,
+  FMULSUBS_OP1,
+  FMULSUBS_OP2,
+  FMULADDD_OP1,
+  FMULADDD_OP2,
+  FMULSUBD_OP1,
+  FMULSUBD_OP2,
+  FNMULSUBH_OP1,
+  FNMULSUBS_OP1,
+  FNMULSUBD_OP1,
+  FMLAv1i32_indexed_OP1,
+  FMLAv1i32_indexed_OP2,
+  FMLAv1i64_indexed_OP1,
+  FMLAv1i64_indexed_OP2,
+  FMLAv4f16_OP1,
+  FMLAv4f16_OP2,
+  FMLAv8f16_OP1,
+  FMLAv8f16_OP2,
+  FMLAv2f32_OP2,
+  FMLAv2f32_OP1,
+  FMLAv2f64_OP1,
+  FMLAv2f64_OP2,
+  FMLAv4i16_indexed_OP1,
+  FMLAv4i16_indexed_OP2,
+  FMLAv8i16_indexed_OP1,
+  FMLAv8i16_indexed_OP2,
+  FMLAv2i32_indexed_OP1,
+  FMLAv2i32_indexed_OP2,
+  FMLAv2i64_indexed_OP1,
+  FMLAv2i64_indexed_OP2,
+  FMLAv4f32_OP1,
+  FMLAv4f32_OP2,
+  FMLAv4i32_indexed_OP1,
+  FMLAv4i32_indexed_OP2,
+  FMLSv1i32_indexed_OP2,
+  FMLSv1i64_indexed_OP2,
+  FMLSv4f16_OP1,
+  FMLSv4f16_OP2,
+  FMLSv8f16_OP1,
+  FMLSv8f16_OP2,
+  FMLSv2f32_OP1,
+  FMLSv2f32_OP2,
+  FMLSv2f64_OP1,
+  FMLSv2f64_OP2,
+  FMLSv4i16_indexed_OP1,
+  FMLSv4i16_indexed_OP2,
+  FMLSv8i16_indexed_OP1,
+  FMLSv8i16_indexed_OP2,
+  FMLSv2i32_indexed_OP1,
+  FMLSv2i32_indexed_OP2,
+  FMLSv2i64_indexed_OP1,
+  FMLSv2i64_indexed_OP2,
+  FMLSv4f32_OP1,
+  FMLSv4f32_OP2,
+  FMLSv4i32_indexed_OP1,
+  FMLSv4i32_indexed_OP2
+};
+
+} // end namespace llvm
+
+#endif