diff --git a/compiler/compiler.h b/compiler/compiler.h
index d688ead..6ec39f9 100644
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -70,8 +70,6 @@
                         bool is_host) const
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) = 0;
 
-  virtual Backend* GetCodeGenerator(CompilationUnit* cu, void* compilation_unit) const = 0;
-
   uint64_t GetMaximumCompilationTimeBeforeWarning() const {
     return maximum_compilation_time_before_warning_;
   }
diff --git a/compiler/dex/backend.h b/compiler/dex/backend.h
deleted file mode 100644
index 9cad933..0000000
--- a/compiler/dex/backend.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ART_COMPILER_DEX_BACKEND_H_
-#define ART_COMPILER_DEX_BACKEND_H_
-
-namespace art {
-
-class ArenaAllocator;
-class CompiledMethod;
-
-class Backend {
-  public:
-    virtual ~Backend() {}
-    virtual void Materialize() = 0;
-    virtual CompiledMethod* GetCompiledMethod() = 0;
-
-    // Queries for backend support for vectors
-    /*
-     * Return the number of bits in a vector register.
-     * @return 0 if vector registers are not supported, or the
-     * number of bits in the vector register if supported.
-     */
-    virtual int VectorRegisterSize() { return 0; }
-
-    /*
-     * Return the number of reservable vector registers supported
-     * @param long_or_fp, true if floating point computations will be
-     * executed or the operations will be long type while vector
-     * registers are reserved.
-     * @return the number of vector registers that are available
-     * @note The backend should ensure that sufficient vector registers
-     * are held back to generate scalar code without exhausting vector
-     * registers, if scalar code also uses the vector registers.
-     */
-    virtual int NumReservableVectorRegisters(bool long_or_fp) {
-      UNUSED(long_or_fp);
-      return 0;
-    }
-
-  protected:
-    explicit Backend(ArenaAllocator* arena) : arena_(arena) {}
-    ArenaAllocator* const arena_;
-};  // Class Backend
-
-}  // namespace art
-
-#endif  // ART_COMPILER_DEX_BACKEND_H_
diff --git a/compiler/dex/compiler_ir.cc b/compiler/dex/compiler_ir.cc
index 0cfa966..7fc1b03 100644
--- a/compiler/dex/compiler_ir.cc
+++ b/compiler/dex/compiler_ir.cc
@@ -18,8 +18,8 @@
 
 #include "arch/instruction_set_features.h"
 #include "base/dumpable.h"
-#include "backend.h"
 #include "dex_flags.h"
+#include "dex/quick/mir_to_lir.h"
 #include "driver/compiler_driver.h"
 #include "mir_graph.h"
 
diff --git a/compiler/dex/compiler_ir.h b/compiler/dex/compiler_ir.h
index e7182a9..51c4a43 100644
--- a/compiler/dex/compiler_ir.h
+++ b/compiler/dex/compiler_ir.h
@@ -29,9 +29,9 @@
 
 namespace art {
 
-class Backend;
 class ClassLinker;
 class CompilerDriver;
+class Mir2Lir;
 class MIRGraph;
 
 struct CompilationUnit {
@@ -66,7 +66,7 @@
   ArenaStack arena_stack;  // Arenas for ScopedArenaAllocator.
 
   std::unique_ptr<MIRGraph> mir_graph;   // MIR container.
-  std::unique_ptr<Backend> cg;           // Target-specific codegen.
+  std::unique_ptr<Mir2Lir> cg;           // Target-specific codegen.
   TimingLogger timings;
   bool print_pass;                 // Do we want to print a pass or not?
 
diff --git a/compiler/dex/quick/codegen_util.cc b/compiler/dex/quick/codegen_util.cc
index 52b2e15..04113db 100644
--- a/compiler/dex/quick/codegen_util.cc
+++ b/compiler/dex/quick/codegen_util.cc
@@ -967,12 +967,12 @@
 
 // TODO: move to mir_to_lir.cc
 Mir2Lir::Mir2Lir(CompilationUnit* cu, MIRGraph* mir_graph, ArenaAllocator* arena)
-    : Backend(arena),
-      literal_list_(nullptr),
+    : literal_list_(nullptr),
       method_literal_list_(nullptr),
       class_literal_list_(nullptr),
       code_literal_list_(nullptr),
       first_fixup_(nullptr),
+      arena_(arena),
       cu_(cu),
       mir_graph_(mir_graph),
       switch_tables_(arena->Adapter(kArenaAllocSwitchTable)),
diff --git a/compiler/dex/quick/mir_to_lir.h b/compiler/dex/quick/mir_to_lir.h
index 64ecf94..888c34e 100644
--- a/compiler/dex/quick/mir_to_lir.h
+++ b/compiler/dex/quick/mir_to_lir.h
@@ -23,7 +23,6 @@
 #include "dex/dex_types.h"
 #include "dex/reg_location.h"
 #include "dex/reg_storage.h"
-#include "dex/backend.h"
 #include "dex/quick/resource_mask.h"
 #include "entrypoints/quick/quick_entrypoints_enum.h"
 #include "invoke_type.h"
@@ -201,7 +200,7 @@
 // Mask to denote sreg as the start of a 64-bit item.  Must not interfere with low 16 bits.
 #define STARTING_WIDE_SREG 0x10000
 
-class Mir2Lir : public Backend {
+class Mir2Lir {
   public:
     static constexpr bool kFailOnSizeError = true && kIsDebugBuild;
     static constexpr bool kReportSizeError = true && kIsDebugBuild;
@@ -1465,6 +1464,30 @@
 
     virtual LIR* InvokeTrampoline(OpKind op, RegStorage r_tgt, QuickEntrypointEnum trampoline) = 0;
 
+    // Queries for backend support for vectors
+    /*
+     * Return the number of bits in a vector register.
+     * @return 0 if vector registers are not supported, or the
+     * number of bits in the vector register if supported.
+     */
+    virtual int VectorRegisterSize() {
+      return 0;
+    }
+
+    /*
+     * Return the number of reservable vector registers supported
+     * @param long_or_fp, true if floating point computations will be
+     * executed or the operations will be long type while vector
+     * registers are reserved.
+     * @return the number of vector registers that are available
+     * @note The backend should ensure that sufficient vector registers
+     * are held back to generate scalar code without exhausting vector
+     * registers, if scalar code also uses the vector registers.
+     */
+    virtual int NumReservableVectorRegisters(bool long_or_fp ATTRIBUTE_UNUSED) {
+      return 0;
+    }
+
   protected:
     Mir2Lir(CompilationUnit* cu, MIRGraph* mir_graph, ArenaAllocator* arena);
 
@@ -1687,6 +1710,7 @@
     LIR* first_fixup_;                         // Doubly-linked list of LIR nodes requiring fixups.
 
   protected:
+    ArenaAllocator* const arena_;
     CompilationUnit* const cu_;
     MIRGraph* const mir_graph_;
     ArenaVector<SwitchTable*> switch_tables_;
diff --git a/compiler/dex/quick/quick_compiler.cc b/compiler/dex/quick/quick_compiler.cc
index 11808ad..3a34fcd 100644
--- a/compiler/dex/quick/quick_compiler.cc
+++ b/compiler/dex/quick/quick_compiler.cc
@@ -25,7 +25,6 @@
 #include "compiler.h"
 #include "dex_file-inl.h"
 #include "dex_file_to_method_inliner_map.h"
-#include "dex/backend.h"
 #include "dex/compiler_ir.h"
 #include "dex/dex_flags.h"
 #include "dex/mir_graph.h"
@@ -35,6 +34,7 @@
 #include "driver/compiler_options.h"
 #include "elf_writer_quick.h"
 #include "jni/quick/jni_compiler.h"
+#include "mir_to_lir.h"
 #include "mirror/art_method-inl.h"
 #include "mirror/object.h"
 #include "runtime.h"
@@ -81,7 +81,7 @@
     OVERRIDE
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
-  Backend* GetCodeGenerator(CompilationUnit* cu, void* compilation_unit) const OVERRIDE;
+  Mir2Lir* GetCodeGenerator(CompilationUnit* cu, void* compilation_unit) const;
 
   void InitCompilationUnit(CompilationUnit& cu) const OVERRIDE;
 
@@ -819,7 +819,7 @@
                                        *GetCompilerDriver());
 }
 
-Backend* QuickCompiler::GetCodeGenerator(CompilationUnit* cu, void* compilation_unit) const {
+Mir2Lir* QuickCompiler::GetCodeGenerator(CompilationUnit* cu, void* compilation_unit) const {
   UNUSED(compilation_unit);
   Mir2Lir* mir_to_lir = nullptr;
   switch (cu->instruction_set) {
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index a590c43..4f05afa 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -105,11 +105,6 @@
                 const std::string& android_root,
                 bool is_host) const OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
-  Backend* GetCodeGenerator(CompilationUnit* cu ATTRIBUTE_UNUSED,
-                            void* compilation_unit ATTRIBUTE_UNUSED) const OVERRIDE {
-    return nullptr;
-  }
-
   void InitCompilationUnit(CompilationUnit& cu ATTRIBUTE_UNUSED) const OVERRIDE {}
 
   void Init() OVERRIDE;