diff --git a/llvm/lib/Target/DirectX/CMakeLists.txt b/llvm/lib/Target/DirectX/CMakeLists.txt
--- a/llvm/lib/Target/DirectX/CMakeLists.txt
+++ b/llvm/lib/Target/DirectX/CMakeLists.txt
@@ -3,10 +3,13 @@
 set(LLVM_TARGET_DEFINITIONS DirectX.td)
 
 tablegen(LLVM DirectXGenSubtargetInfo.inc -gen-subtarget)
+tablegen(LLVM DirectXGenInstrInfo.inc -gen-instr-info)
+tablegen(LLVM DirectXGenRegisterInfo.inc -gen-register-info)
 
 add_public_tablegen_target(DirectXCommonTableGen)
 
 add_llvm_target(DirectXCodeGen
+  DirectXRegisterInfo.cpp
   DirectXSubtarget.cpp
   DirectXTargetMachine.cpp
   DXILOpLowering.cpp
diff --git a/llvm/lib/Target/DirectX/DXILStubs.td b/llvm/lib/Target/DirectX/DXILStubs.td
new file mode 100644
--- /dev/null
+++ b/llvm/lib/Target/DirectX/DXILStubs.td
@@ -0,0 +1,20 @@
+// DXIL doesn't actually use registers, but this gets the boilerplate code
+// generated through tablegen.
+let Namespace = "DXIL" in {
+def DXIL : Register<"DXIL">;
+def DXILClass : RegisterClass<"DXIL", [i32], 32, (add DXIL)>;
+}
+
+class DXILInst
+  : Instruction {
+
+  let Namespace = "DXIL";
+  let DecoderNamespace = "DXIL";
+
+  dag OutOperandList = (outs);
+  dag InOperandList =  (ins);
+  let AsmString = "dummy";
+  let Pattern = [];
+}
+
+def DummyInst : DXILInst;
diff --git a/llvm/lib/Target/DirectX/DirectX.td b/llvm/lib/Target/DirectX/DirectX.td
--- a/llvm/lib/Target/DirectX/DirectX.td
+++ b/llvm/lib/Target/DirectX/DirectX.td
@@ -16,6 +16,7 @@
 //===----------------------------------------------------------------------===//
 
 include "llvm/Target/Target.td"
+include "DXILStubs.td"
 
 //===----------------------------------------------------------------------===//
 // DirectX Subtarget features.
diff --git a/llvm/lib/Target/DirectX/DirectXFrameLowering.h b/llvm/lib/Target/DirectX/DirectXFrameLowering.h
new file mode 100644
--- /dev/null
+++ b/llvm/lib/Target/DirectX/DirectXFrameLowering.h
@@ -0,0 +1,37 @@
+//===-- DirectXFrameLowering.h - Frame lowering for DirectX --*- 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 class implements DirectX-specific bits of TargetFrameLowering class.
+// This is just a stub because the current DXIL backend does not actually lower
+// through the MC layer.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DIRECTX_DIRECTXFRAMELOWERING_H
+#define LLVM_DIRECTX_DIRECTXFRAMELOWERING_H
+
+#include "llvm/CodeGen/TargetFrameLowering.h"
+#include "llvm/Support/Alignment.h"
+
+namespace llvm {
+class DirectXSubtarget;
+
+class DirectXFrameLowering : public TargetFrameLowering {
+public:
+  explicit DirectXFrameLowering(const DirectXSubtarget &STI)
+      : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, Align(8), 0) {}
+
+  void emitPrologue(MachineFunction &MF,
+                    MachineBasicBlock &MBB) const override {}
+  void emitEpilogue(MachineFunction &MF,
+                    MachineBasicBlock &MBB) const override {}
+
+  bool hasFP(const MachineFunction &MF) const override { return false; }
+};
+} // namespace llvm
+#endif // LLVM_DIRECTX_DIRECTXFRAMELOWERING_H
diff --git a/llvm/lib/Target/DirectX/DirectXRegisterInfo.h b/llvm/lib/Target/DirectX/DirectXRegisterInfo.h
new file mode 100644
--- /dev/null
+++ b/llvm/lib/Target/DirectX/DirectXRegisterInfo.h
@@ -0,0 +1,28 @@
+//===-- DirectXRegisterInfo.h - Define RegisterInfo for DirectX -*- 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 declares the DirectX specific subclass of TargetRegisterInfo.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DIRECTX_DXILREGISTERINFO_H
+#define LLVM_DIRECTX_DXILREGISTERINFO_H
+
+#include "llvm/CodeGen/TargetRegisterInfo.h"
+
+#define GET_REGINFO_HEADER
+#include "DirectXGenRegisterInfo.inc"
+
+namespace llvm {
+struct DirectXRegisterInfo : public DirectXGenRegisterInfo {
+  DirectXRegisterInfo() : DirectXGenRegisterInfo(0) {}
+  ~DirectXRegisterInfo() override = default;
+};
+} // namespace llvm
+
+#endif // LLVM_DIRECTX_DXILREGISTERINFO_H
diff --git a/llvm/lib/Target/DirectX/DirectXRegisterInfo.cpp b/llvm/lib/Target/DirectX/DirectXRegisterInfo.cpp
new file mode 100644
--- /dev/null
+++ b/llvm/lib/Target/DirectX/DirectXRegisterInfo.cpp
@@ -0,0 +1,20 @@
+//===-- DirectXRegisterInfo.cpp - RegisterInfo for DirectX -*- 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 the DirectX specific subclass of TargetRegisterInfo.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DirectXRegisterInfo.h"
+#include "DirectXFrameLowering.h"
+#include "MCTargetDesc/DirectXMCTargetDesc.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/TargetSubtargetInfo.h"
+
+#define GET_REGINFO_TARGET_DESC
+#include "DirectXGenRegisterInfo.inc"
diff --git a/llvm/lib/Target/DirectX/MCTargetDesc/DirectXMCTargetDesc.h b/llvm/lib/Target/DirectX/MCTargetDesc/DirectXMCTargetDesc.h
new file mode 100644
--- /dev/null
+++ b/llvm/lib/Target/DirectX/MCTargetDesc/DirectXMCTargetDesc.h
@@ -0,0 +1,32 @@
+//===- DirectXMCTargetDesc.h - DirectX Target Interface ---------*- 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file contains DirectX target interface.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DIRECTX_DIRECTXMCTARGETDESC_H
+#define LLVM_DIRECTX_DIRECTXMCTARGETDESC_H
+
+// Defines symbolic names for AArch64 registers.  This defines a mapping from
+// register name to register number.
+//
+#define GET_REGINFO_ENUM
+#include "DirectXGenRegisterInfo.inc"
+
+// Defines symbolic names for the AArch64 instructions.
+//
+#define GET_INSTRINFO_ENUM
+#define GET_INSTRINFO_MC_HELPER_DECLS
+#include "DirectXGenInstrInfo.inc"
+
+#define GET_SUBTARGETINFO_ENUM
+#include "DirectXGenSubtargetInfo.inc"
+
+#endif // LLVM_DIRECTX_DIRECTXMCTARGETDESC_H