Merge "Remove DEBUG_JIT from Zygote flags."
diff --git a/compiler/image_writer.cc b/compiler/image_writer.cc
index 3777015..3d9e7e7 100644
--- a/compiler/image_writer.cc
+++ b/compiler/image_writer.cc
@@ -1441,34 +1441,28 @@
       : reinterpret_cast<T*>(image_begin_ + NativeOffsetInImage(obj));
 }
 
-void ImageWriter::FixupClass(mirror::Class* orig, mirror::Class* copy) {
-  // Update the field arrays.
-  copy->SetSFieldsPtrUnchecked(NativeLocationInImage(orig->GetSFieldsPtr()));
-  copy->SetIFieldsPtrUnchecked(NativeLocationInImage(orig->GetIFieldsPtr()));
-  // Update direct and virtual method arrays.
-  copy->SetDirectMethodsPtrUnchecked(NativeLocationInImage(orig->GetDirectMethodsPtr()));
-  copy->SetVirtualMethodsPtr(NativeLocationInImage(orig->GetVirtualMethodsPtr()));
-  // Update dex cache strings.
-  copy->SetDexCacheStrings(NativeLocationInImage(orig->GetDexCacheStrings()));
-  // Fix up embedded tables.
-  if (!orig->IsTemp()) {
-    // TODO: Why do we have temp classes in some cases?
-    if (orig->ShouldHaveEmbeddedImtAndVTable()) {
-      for (int32_t i = 0; i < orig->GetEmbeddedVTableLength(); ++i) {
-        ArtMethod* orig_method = orig->GetEmbeddedVTableEntry(i, target_ptr_size_);
-        copy->SetEmbeddedVTableEntryUnchecked(
-            i,
-            NativeLocationInImage(orig_method),
-            target_ptr_size_);
-      }
-      for (size_t i = 0; i < mirror::Class::kImtSize; ++i) {
-        copy->SetEmbeddedImTableEntry(
-            i,
-            NativeLocationInImage(orig->GetEmbeddedImTableEntry(i, target_ptr_size_)),
-            target_ptr_size_);
-      }
-    }
+template <typename T>
+T* ImageWriter::NativeCopyLocation(T* obj) {
+  return (obj == nullptr || IsInBootImage(obj))
+      ? obj
+      : reinterpret_cast<T*>(image_->Begin() + NativeOffsetInImage(obj));
+}
+
+class NativeLocationVisitor {
+ public:
+  explicit NativeLocationVisitor(ImageWriter* image_writer) : image_writer_(image_writer) {}
+
+  template <typename T>
+  T* operator()(T* ptr) const {
+    return image_writer_->NativeLocationInImage(ptr);
   }
+
+ private:
+  ImageWriter* const image_writer_;
+};
+
+void ImageWriter::FixupClass(mirror::Class* orig, mirror::Class* copy) {
+  orig->FixupNativePointers(copy, target_ptr_size_, NativeLocationVisitor(this));
   FixupClassVisitor visitor(this, copy);
   static_cast<mirror::Object*>(orig)->VisitReferences(visitor, visitor);
 }
@@ -1528,6 +1522,21 @@
   }
 }
 
+
+class ImageAddressVisitor {
+ public:
+  explicit ImageAddressVisitor(ImageWriter* image_writer) : image_writer_(image_writer) {}
+
+  template <typename T>
+  T* operator()(T* ptr) const SHARED_REQUIRES(Locks::mutator_lock_) {
+    return image_writer_->GetImageAddress(ptr);
+  }
+
+ private:
+  ImageWriter* const image_writer_;
+};
+
+
 void ImageWriter::FixupDexCache(mirror::DexCache* orig_dex_cache,
                                 mirror::DexCache* copy_dex_cache) {
   // Though the DexCache array fields are usually treated as native pointers, we set the full
@@ -1536,52 +1545,39 @@
   //     static_cast<int64_t>(reinterpret_cast<uintptr_t>(image_begin_ + offset))).
   GcRoot<mirror::String>* orig_strings = orig_dex_cache->GetStrings();
   if (orig_strings != nullptr) {
-    uintptr_t copy_strings_offset = NativeOffsetInImage(orig_strings);
-    copy_dex_cache->SetField64<false>(
-        mirror::DexCache::StringsOffset(),
-        static_cast<int64_t>(reinterpret_cast<uintptr_t>(image_begin_ + copy_strings_offset)));
-    GcRoot<mirror::String>* copy_strings =
-        reinterpret_cast<GcRoot<mirror::String>*>(image_->Begin() + copy_strings_offset);
-    for (size_t i = 0, num = orig_dex_cache->NumStrings(); i != num; ++i) {
-      copy_strings[i] = GcRoot<mirror::String>(GetImageAddress(orig_strings[i].Read()));
-    }
+    copy_dex_cache->SetFieldPtrWithSize<false>(mirror::DexCache::StringsOffset(),
+                                               NativeLocationInImage(orig_strings),
+                                               /*pointer size*/8u);
+    orig_dex_cache->FixupStrings(NativeCopyLocation(orig_strings), ImageAddressVisitor(this));
   }
   GcRoot<mirror::Class>* orig_types = orig_dex_cache->GetResolvedTypes();
   if (orig_types != nullptr) {
-    uintptr_t copy_types_offset = NativeOffsetInImage(orig_types);
-    copy_dex_cache->SetField64<false>(
-        mirror::DexCache::ResolvedTypesOffset(),
-        static_cast<int64_t>(reinterpret_cast<uintptr_t>(image_begin_ + copy_types_offset)));
-    GcRoot<mirror::Class>* copy_types =
-        reinterpret_cast<GcRoot<mirror::Class>*>(image_->Begin() + copy_types_offset);
-    for (size_t i = 0, num = orig_dex_cache->NumResolvedTypes(); i != num; ++i) {
-      copy_types[i] = GcRoot<mirror::Class>(GetImageAddress(orig_types[i].Read()));
-    }
+    copy_dex_cache->SetFieldPtrWithSize<false>(mirror::DexCache::ResolvedTypesOffset(),
+                                               NativeLocationInImage(orig_types),
+                                               /*pointer size*/8u);
+    orig_dex_cache->FixupResolvedTypes(NativeCopyLocation(orig_types), ImageAddressVisitor(this));
   }
   ArtMethod** orig_methods = orig_dex_cache->GetResolvedMethods();
   if (orig_methods != nullptr) {
-    uintptr_t copy_methods_offset = NativeOffsetInImage(orig_methods);
-    copy_dex_cache->SetField64<false>(
-        mirror::DexCache::ResolvedMethodsOffset(),
-        static_cast<int64_t>(reinterpret_cast<uintptr_t>(image_begin_ + copy_methods_offset)));
-    ArtMethod** copy_methods =
-        reinterpret_cast<ArtMethod**>(image_->Begin() + copy_methods_offset);
+    copy_dex_cache->SetFieldPtrWithSize<false>(mirror::DexCache::ResolvedMethodsOffset(),
+                                               NativeLocationInImage(orig_methods),
+                                               /*pointer size*/8u);
+    ArtMethod** copy_methods = NativeCopyLocation(orig_methods);
     for (size_t i = 0, num = orig_dex_cache->NumResolvedMethods(); i != num; ++i) {
       ArtMethod* orig = mirror::DexCache::GetElementPtrSize(orig_methods, i, target_ptr_size_);
-      ArtMethod* copy = IsInBootImage(orig) ? orig : NativeLocationInImage(orig);
+      ArtMethod* copy = NativeLocationInImage(orig);
       mirror::DexCache::SetElementPtrSize(copy_methods, i, copy, target_ptr_size_);
     }
   }
   ArtField** orig_fields = orig_dex_cache->GetResolvedFields();
   if (orig_fields != nullptr) {
-    uintptr_t copy_fields_offset = NativeOffsetInImage(orig_fields);
-    copy_dex_cache->SetField64<false>(
-        mirror::DexCache::ResolvedFieldsOffset(),
-        static_cast<int64_t>(reinterpret_cast<uintptr_t>(image_begin_ + copy_fields_offset)));
-    ArtField** copy_fields = reinterpret_cast<ArtField**>(image_->Begin() + copy_fields_offset);
+    copy_dex_cache->SetFieldPtrWithSize<false>(mirror::DexCache::ResolvedFieldsOffset(),
+                                               NativeLocationInImage(orig_fields),
+                                               /*pointer size*/8u);
+    ArtField** copy_fields = NativeCopyLocation(orig_fields);
     for (size_t i = 0, num = orig_dex_cache->NumResolvedFields(); i != num; ++i) {
       ArtField* orig = mirror::DexCache::GetElementPtrSize(orig_fields, i, target_ptr_size_);
-      ArtField* copy = IsInBootImage(orig) ? orig : NativeLocationInImage(orig);
+      ArtField* copy = NativeLocationInImage(orig);
       mirror::DexCache::SetElementPtrSize(copy_fields, i, copy, target_ptr_size_);
     }
   }
diff --git a/compiler/image_writer.h b/compiler/image_writer.h
index a0a785e..22cb91a 100644
--- a/compiler/image_writer.h
+++ b/compiler/image_writer.h
@@ -347,9 +347,14 @@
 
   uintptr_t NativeOffsetInImage(void* obj);
 
+  // Location of where the object will be when the image is loaded at runtime.
   template <typename T>
   T* NativeLocationInImage(T* obj);
 
+  // Location of where the temporary copy of the object currently is.
+  template <typename T>
+  T* NativeCopyLocation(T* obj);
+
   // Return true of obj is inside of the boot image space. This may only return true if we are
   // compiling an app image.
   bool IsInBootImage(const void* obj) const;
@@ -446,6 +451,7 @@
   friend class FixupClassVisitor;
   friend class FixupRootVisitor;
   friend class FixupVisitor;
+  friend class NativeLocationVisitor;
   friend class NonImageClassesVisitor;
   DISALLOW_COPY_AND_ASSIGN(ImageWriter);
 };
diff --git a/compiler/optimizing/reference_type_propagation.cc b/compiler/optimizing/reference_type_propagation.cc
index 3b78264..0d05c49 100644
--- a/compiler/optimizing/reference_type_propagation.cc
+++ b/compiler/optimizing/reference_type_propagation.cc
@@ -614,23 +614,36 @@
   }
 
   bool is_exact = a.IsExact() && b.IsExact();
-  Handle<mirror::Class> type_handle;
+  ReferenceTypeInfo::TypeHandle result_type_handle;
+  ReferenceTypeInfo::TypeHandle a_type_handle = a.GetTypeHandle();
+  ReferenceTypeInfo::TypeHandle b_type_handle = b.GetTypeHandle();
+  bool a_is_interface = a_type_handle->IsInterface();
+  bool b_is_interface = b_type_handle->IsInterface();
 
   if (a.GetTypeHandle().Get() == b.GetTypeHandle().Get()) {
-    type_handle = a.GetTypeHandle();
+    result_type_handle = a_type_handle;
   } else if (a.IsSupertypeOf(b)) {
-    type_handle = a.GetTypeHandle();
+    result_type_handle = a_type_handle;
     is_exact = false;
   } else if (b.IsSupertypeOf(a)) {
-    type_handle = b.GetTypeHandle();
+    result_type_handle = b_type_handle;
+    is_exact = false;
+  } else if (!a_is_interface && !b_is_interface) {
+    result_type_handle = handles_->NewHandle(a_type_handle->GetCommonSuperClass(b_type_handle));
     is_exact = false;
   } else {
-    // TODO: Find the first common super class.
-    type_handle = object_class_handle_;
+    // This can happen if:
+    //    - both types are interfaces. TODO(calin): implement
+    //    - one is an interface, the other a class, and the type does not implement the interface
+    //      e.g:
+    //        void foo(Interface i, boolean cond) {
+    //          Object o = cond ? i : new Object();
+    //        }
+    result_type_handle = object_class_handle_;
     is_exact = false;
   }
 
-  return ReferenceTypeInfo::Create(type_handle, is_exact);
+  return ReferenceTypeInfo::Create(result_type_handle, is_exact);
 }
 
 static void UpdateArrayGet(HArrayGet* instr,
diff --git a/patchoat/patchoat.cc b/patchoat/patchoat.cc
index c587f68..3d9f7dc 100644
--- a/patchoat/patchoat.cc
+++ b/patchoat/patchoat.cc
@@ -526,13 +526,26 @@
   temp_table.VisitRoots(&visitor, kVisitRootFlagAllRoots);
 }
 
+class RelocatedPointerVisitor {
+ public:
+  explicit RelocatedPointerVisitor(PatchOat* patch_oat) : patch_oat_(patch_oat) {}
+
+  template <typename T>
+  T* operator()(T* ptr) const {
+    return patch_oat_->RelocatedAddressOfPointer(ptr);
+  }
+
+ private:
+  PatchOat* const patch_oat_;
+};
+
 void PatchOat::PatchDexFileArrays(mirror::ObjectArray<mirror::Object>* img_roots) {
   auto* dex_caches = down_cast<mirror::ObjectArray<mirror::DexCache>*>(
       img_roots->Get(ImageHeader::kDexCaches));
+  const size_t pointer_size = InstructionSetPointerSize(isa_);
   for (size_t i = 0, count = dex_caches->GetLength(); i < count; ++i) {
     auto* orig_dex_cache = dex_caches->GetWithoutChecks(i);
     auto* copy_dex_cache = RelocatedCopyOf(orig_dex_cache);
-    const size_t pointer_size = InstructionSetPointerSize(isa_);
     // Though the DexCache array fields are usually treated as native pointers, we set the full
     // 64-bit values here, clearing the top 32 bits for 32-bit targets. The zero-extension is
     // done by casting to the unsigned type uintptr_t before casting to int64_t, i.e.
@@ -543,10 +556,7 @@
         mirror::DexCache::StringsOffset(),
         static_cast<int64_t>(reinterpret_cast<uintptr_t>(relocated_strings)));
     if (orig_strings != nullptr) {
-      GcRoot<mirror::String>* copy_strings = RelocatedCopyOf(orig_strings);
-      for (size_t j = 0, num = orig_dex_cache->NumStrings(); j != num; ++j) {
-        copy_strings[j] = GcRoot<mirror::String>(RelocatedAddressOfPointer(orig_strings[j].Read()));
-      }
+      orig_dex_cache->FixupStrings(RelocatedCopyOf(orig_strings), RelocatedPointerVisitor(this));
     }
     GcRoot<mirror::Class>* orig_types = orig_dex_cache->GetResolvedTypes();
     GcRoot<mirror::Class>* relocated_types = RelocatedAddressOfPointer(orig_types);
@@ -554,10 +564,8 @@
         mirror::DexCache::ResolvedTypesOffset(),
         static_cast<int64_t>(reinterpret_cast<uintptr_t>(relocated_types)));
     if (orig_types != nullptr) {
-      GcRoot<mirror::Class>* copy_types = RelocatedCopyOf(orig_types);
-      for (size_t j = 0, num = orig_dex_cache->NumResolvedTypes(); j != num; ++j) {
-        copy_types[j] = GcRoot<mirror::Class>(RelocatedAddressOfPointer(orig_types[j].Read()));
-      }
+      orig_dex_cache->FixupResolvedTypes(RelocatedCopyOf(orig_types),
+                                         RelocatedPointerVisitor(this));
     }
     ArtMethod** orig_methods = orig_dex_cache->GetResolvedMethods();
     ArtMethod** relocated_methods = RelocatedAddressOfPointer(orig_methods);
@@ -588,25 +596,6 @@
   }
 }
 
-void PatchOat::FixupNativePointerArray(mirror::PointerArray* object) {
-  if (object->IsIntArray()) {
-    mirror::IntArray* arr = object->AsIntArray();
-    mirror::IntArray* copy_arr = down_cast<mirror::IntArray*>(RelocatedCopyOf(arr));
-    for (size_t j = 0, count2 = arr->GetLength(); j < count2; ++j) {
-      copy_arr->SetWithoutChecks<false>(
-          j, RelocatedAddressOfIntPointer(arr->GetWithoutChecks(j)));
-    }
-  } else {
-    CHECK(object->IsLongArray());
-    mirror::LongArray* arr = object->AsLongArray();
-    mirror::LongArray* copy_arr = down_cast<mirror::LongArray*>(RelocatedCopyOf(arr));
-    for (size_t j = 0, count2 = arr->GetLength(); j < count2; ++j) {
-      copy_arr->SetWithoutChecks<false>(
-          j, RelocatedAddressOfIntPointer(arr->GetWithoutChecks(j)));
-    }
-  }
-}
-
 bool PatchOat::PatchImage() {
   ImageHeader* image_header = reinterpret_cast<ImageHeader*>(image_->Begin());
   CHECK_GT(image_->Size(), sizeof(ImageHeader));
@@ -674,17 +663,14 @@
   PatchOat::PatchVisitor visitor(this, copy);
   object->VisitReferences<kVerifyNone>(visitor, visitor);
   if (object->IsClass<kVerifyNone>()) {
-    auto* klass = object->AsClass();
-    auto* copy_klass = down_cast<mirror::Class*>(copy);
-    copy_klass->SetDexCacheStrings(RelocatedAddressOfPointer(klass->GetDexCacheStrings()));
-    copy_klass->SetSFieldsPtrUnchecked(RelocatedAddressOfPointer(klass->GetSFieldsPtr()));
-    copy_klass->SetIFieldsPtrUnchecked(RelocatedAddressOfPointer(klass->GetIFieldsPtr()));
-    copy_klass->SetDirectMethodsPtrUnchecked(
-        RelocatedAddressOfPointer(klass->GetDirectMethodsPtr()));
-    copy_klass->SetVirtualMethodsPtr(RelocatedAddressOfPointer(klass->GetVirtualMethodsPtr()));
+    const size_t pointer_size = InstructionSetPointerSize(isa_);
+    mirror::Class* klass = object->AsClass();
+    mirror::Class* copy_klass = down_cast<mirror::Class*>(copy);
+    RelocatedPointerVisitor native_visitor(this);
+    klass->FixupNativePointers(copy_klass, pointer_size, native_visitor);
     auto* vtable = klass->GetVTable();
     if (vtable != nullptr) {
-      FixupNativePointerArray(vtable);
+      vtable->Fixup(RelocatedCopyOf(vtable), pointer_size, native_visitor);
     }
     auto* iftable = klass->GetIfTable();
     if (iftable != nullptr) {
@@ -692,24 +678,12 @@
         if (iftable->GetMethodArrayCount(i) > 0) {
           auto* method_array = iftable->GetMethodArray(i);
           CHECK(method_array != nullptr);
-          FixupNativePointerArray(method_array);
+          method_array->Fixup(RelocatedCopyOf(method_array), pointer_size, native_visitor);
         }
       }
     }
-    if (klass->ShouldHaveEmbeddedImtAndVTable()) {
-      const size_t pointer_size = InstructionSetPointerSize(isa_);
-      for (int32_t i = 0; i < klass->GetEmbeddedVTableLength(); ++i) {
-        copy_klass->SetEmbeddedVTableEntryUnchecked(i, RelocatedAddressOfPointer(
-            klass->GetEmbeddedVTableEntry(i, pointer_size)), pointer_size);
-      }
-      for (size_t i = 0; i < mirror::Class::kImtSize; ++i) {
-        copy_klass->SetEmbeddedImTableEntry(i, RelocatedAddressOfPointer(
-            klass->GetEmbeddedImTableEntry(i, pointer_size)), pointer_size);
-      }
-    }
-  }
-  if (object->GetClass() == mirror::Method::StaticClass() ||
-      object->GetClass() == mirror::Constructor::StaticClass()) {
+  } else if (object->GetClass() == mirror::Method::StaticClass() ||
+             object->GetClass() == mirror::Constructor::StaticClass()) {
     // Need to go update the ArtMethod.
     auto* dest = down_cast<mirror::AbstractMethod*>(copy);
     auto* src = down_cast<mirror::AbstractMethod*>(object);
diff --git a/patchoat/patchoat.h b/patchoat/patchoat.h
index 87ecc61..0915014 100644
--- a/patchoat/patchoat.h
+++ b/patchoat/patchoat.h
@@ -102,8 +102,6 @@
       SHARED_REQUIRES(Locks::mutator_lock_);
   void FixupMethod(ArtMethod* object, ArtMethod* copy)
       SHARED_REQUIRES(Locks::mutator_lock_);
-  void FixupNativePointerArray(mirror::PointerArray* object)
-      SHARED_REQUIRES(Locks::mutator_lock_);
   bool InHeap(mirror::Object*);
 
   // Patches oat in place, modifying the oat_file given to the constructor.
@@ -200,6 +198,7 @@
   TimingLogger* timings_;
 
   friend class FixupRootVisitor;
+  friend class RelocatedPointerVisitor;
   friend class PatchOatArtFieldVisitor;
   friend class PatchOatArtMethodVisitor;
   DISALLOW_IMPLICIT_CONSTRUCTORS(PatchOat);
diff --git a/runtime/arch/x86/quick_entrypoints_x86.S b/runtime/arch/x86/quick_entrypoints_x86.S
index 6eacac1..463c9cf 100644
--- a/runtime/arch/x86/quick_entrypoints_x86.S
+++ b/runtime/arch/x86/quick_entrypoints_x86.S
@@ -788,7 +788,106 @@
 
 // Generate the allocation entrypoints for each allocator.
 GENERATE_ALLOC_ENTRYPOINTS_FOR_EACH_ALLOCATOR
-GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT(_rosalloc, RosAlloc)
+
+// A hand-written override for GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT(_rosalloc, RosAlloc).
+DEFINE_FUNCTION art_quick_alloc_object_rosalloc
+    // Fast path rosalloc allocation.
+    // eax: uint32_t type_idx/return value, ecx: ArtMethod*
+    // ebx, edx: free
+    PUSH edi
+    movl ART_METHOD_DEX_CACHE_TYPES_OFFSET_32(%ecx), %edx  // Load dex cache resolved types array
+                                                        // Load the class (edx)
+    movl 0(%edx, %eax, COMPRESSED_REFERENCE_SIZE), %edx
+    testl %edx, %edx                                    // Check null class
+    jz   .Lart_quick_alloc_object_rosalloc_slow_path
+                                                        // Check class status
+    cmpl LITERAL(MIRROR_CLASS_STATUS_INITIALIZED), MIRROR_CLASS_STATUS_OFFSET(%edx)
+    jne  .Lart_quick_alloc_object_rosalloc_slow_path
+                                                        // No fake dependence needed on x86
+                                                        // between status and flags load,
+                                                        // since each load is a load-acquire,
+                                                        // no loads reordering.
+                                                        // Check access flags has
+                                                        // kAccClassIsFinalizable
+    testl LITERAL(ACCESS_FLAGS_CLASS_IS_FINALIZABLE), MIRROR_CLASS_ACCESS_FLAGS_OFFSET(%edx)
+    jnz   .Lart_quick_alloc_object_rosalloc_slow_path
+
+    movl %fs:THREAD_SELF_OFFSET, %ebx                   // ebx = thread
+                                                        // Check if the thread local allocation
+                                                        // stack has room
+    movl THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET(%ebx), %edi
+    cmpl THREAD_LOCAL_ALLOC_STACK_END_OFFSET(%ebx), %edi
+    jae  .Lart_quick_alloc_object_rosalloc_slow_path
+
+    movl MIRROR_CLASS_OBJECT_SIZE_OFFSET(%edx), %edi    // Load the object size (edi)
+                                                        // Check if the size is for a thread
+                                                        // local allocation
+    cmpl LITERAL(ROSALLOC_MAX_THREAD_LOCAL_BRACKET_SIZE), %edi
+    ja   .Lart_quick_alloc_object_rosalloc_slow_path
+    decl %edi
+    shrl LITERAL(ROSALLOC_BRACKET_QUANTUM_SIZE_SHIFT), %edi // Calculate the rosalloc bracket index
+                                                            // from object size.
+                                                            // Align up the size by the rosalloc
+                                                            // bracket quantum size and divide
+                                                            // by the quantum size and subtract
+                                                            // by 1. This code is a shorter but
+                                                            // equivalent version.
+                                                        // Load thread local rosalloc run (ebx)
+    movl THREAD_ROSALLOC_RUNS_OFFSET(%ebx, %edi, __SIZEOF_POINTER__), %ebx
+                                                        // Load free_list head (edi),
+                                                        // this will be the return value.
+    movl (ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_HEAD_OFFSET)(%ebx), %edi
+    test %edi, %edi
+    jz   .Lart_quick_alloc_object_rosalloc_slow_path
+                                                        // Point of no slow path. Won't go to
+                                                        // the slow path from here on. Ok to
+                                                        // clobber eax and ecx.
+    movl %edi, %eax
+                                                        // Load the next pointer of the head
+                                                        // and update head of free list with
+                                                        // next pointer
+    movl ROSALLOC_SLOT_NEXT_OFFSET(%eax), %edi
+    movl %edi, (ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_HEAD_OFFSET)(%ebx)
+                                                        // Decrement size of free list by 1
+    decl (ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_SIZE_OFFSET)(%ebx)
+                                                        // Store the class pointer in the
+                                                        // header. This also overwrites the
+                                                        // next pointer. The offsets are
+                                                        // asserted to match.
+#if ROSALLOC_SLOT_NEXT_OFFSET != MIRROR_OBJECT_CLASS_OFFSET
+#error "Class pointer needs to overwrite next pointer."
+#endif
+    POISON_HEAP_REF edx
+    movl %edx, MIRROR_OBJECT_CLASS_OFFSET(%eax)
+    movl %fs:THREAD_SELF_OFFSET, %ebx                   // ebx = thread
+                                                        // Push the new object onto the thread
+                                                        // local allocation stack and
+                                                        // increment the thread local
+                                                        // allocation stack top.
+    movl THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET(%ebx), %edi
+    movl %eax, (%edi)
+    addl LITERAL(COMPRESSED_REFERENCE_SIZE), %edi
+    movl %edi, THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET(%ebx)
+                                                        // No fence needed for x86.
+    POP edi
+    ret
+.Lart_quick_alloc_object_rosalloc_slow_path:
+    POP edi
+    SETUP_REFS_ONLY_CALLEE_SAVE_FRAME ebx, ebx // save ref containing registers for GC
+    // Outgoing argument set up
+    PUSH eax                      // alignment padding
+    pushl %fs:THREAD_SELF_OFFSET  // pass Thread::Current()
+    CFI_ADJUST_CFA_OFFSET(4)
+    PUSH ecx
+    PUSH eax
+    call SYMBOL(artAllocObjectFromCodeRosAlloc)  // cxx_name(arg0, arg1, Thread*)
+    addl LITERAL(16), %esp        // pop arguments
+    CFI_ADJUST_CFA_OFFSET(-16)
+    RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME          // resotre frame up to return address
+    RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER      // return or deliver exception
+END_FUNCTION art_quick_alloc_object_rosalloc
+
+
 GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT(_tlab, TLAB)
 
 ONE_ARG_DOWNCALL art_quick_resolve_string, artResolveStringFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index 13d0b84..32e77b7 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -2684,26 +2684,26 @@
     case JDWP::JT_BOOLEAN:
     case JDWP::JT_BYTE:
       CHECK_EQ(width, 1U);
-      if (!visitor.SetVRegFromDebugger(m, vreg, static_cast<uint32_t>(value), kIntVReg)) {
+      if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(value), kIntVReg)) {
         return FailSetLocalValue(visitor, vreg, tag, static_cast<uint32_t>(value));
       }
       break;
     case JDWP::JT_SHORT:
     case JDWP::JT_CHAR:
       CHECK_EQ(width, 2U);
-      if (!visitor.SetVRegFromDebugger(m, vreg, static_cast<uint32_t>(value), kIntVReg)) {
+      if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(value), kIntVReg)) {
         return FailSetLocalValue(visitor, vreg, tag, static_cast<uint32_t>(value));
       }
       break;
     case JDWP::JT_INT:
       CHECK_EQ(width, 4U);
-      if (!visitor.SetVRegFromDebugger(m, vreg, static_cast<uint32_t>(value), kIntVReg)) {
+      if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(value), kIntVReg)) {
         return FailSetLocalValue(visitor, vreg, tag, static_cast<uint32_t>(value));
       }
       break;
     case JDWP::JT_FLOAT:
       CHECK_EQ(width, 4U);
-      if (!visitor.SetVRegFromDebugger(m, vreg, static_cast<uint32_t>(value), kFloatVReg)) {
+      if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(value), kFloatVReg)) {
         return FailSetLocalValue(visitor, vreg, tag, static_cast<uint32_t>(value));
       }
       break;
@@ -2721,7 +2721,7 @@
         VLOG(jdwp) << tag << " object " << o << " is an invalid object";
         return JDWP::ERR_INVALID_OBJECT;
       }
-      if (!visitor.SetVRegFromDebugger(m, vreg, static_cast<uint32_t>(reinterpret_cast<uintptr_t>(o)),
+      if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(reinterpret_cast<uintptr_t>(o)),
                                  kReferenceVReg)) {
         return FailSetLocalValue(visitor, vreg, tag, reinterpret_cast<uintptr_t>(o));
       }
@@ -2729,14 +2729,14 @@
     }
     case JDWP::JT_DOUBLE: {
       CHECK_EQ(width, 8U);
-      if (!visitor.SetVRegPairFromDebugger(m, vreg, value, kDoubleLoVReg, kDoubleHiVReg)) {
+      if (!visitor.SetVRegPair(m, vreg, value, kDoubleLoVReg, kDoubleHiVReg)) {
         return FailSetLocalValue(visitor, vreg, tag, value);
       }
       break;
     }
     case JDWP::JT_LONG: {
       CHECK_EQ(width, 8U);
-      if (!visitor.SetVRegPairFromDebugger(m, vreg, value, kLongLoVReg, kLongHiVReg)) {
+      if (!visitor.SetVRegPair(m, vreg, value, kLongLoVReg, kLongHiVReg)) {
         return FailSetLocalValue(visitor, vreg, tag, value);
       }
       break;
diff --git a/runtime/mirror/array-inl.h b/runtime/mirror/array-inl.h
index ec7d758..b6f424b 100644
--- a/runtime/mirror/array-inl.h
+++ b/runtime/mirror/array-inl.h
@@ -394,6 +394,19 @@
   }
 }
 
+template <typename Visitor>
+inline void PointerArray::Fixup(mirror::PointerArray* dest,
+                                size_t pointer_size,
+                                const Visitor& visitor) {
+  for (size_t i = 0, count = GetLength(); i < count; ++i) {
+    void* ptr = GetElementPtrSize<void*>(i, pointer_size);
+    void* new_ptr = visitor(ptr);
+    if (ptr != new_ptr) {
+      dest->SetElementPtrSize<false, true>(i, new_ptr, pointer_size);
+    }
+  }
+}
+
 }  // namespace mirror
 }  // namespace art
 
diff --git a/runtime/mirror/array.h b/runtime/mirror/array.h
index 7458424..50d77eb 100644
--- a/runtime/mirror/array.h
+++ b/runtime/mirror/array.h
@@ -190,6 +190,12 @@
   template<bool kTransactionActive = false, bool kUnchecked = false, typename T>
   void SetElementPtrSize(uint32_t idx, T element, size_t ptr_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
+
+  // Fixup the pointers in the dest arrays by passing our pointers through the visitor. Only copies
+  // to dest if visitor(source_ptr) != source_ptr.
+  template <typename Visitor>
+  void Fixup(mirror::PointerArray* dest, size_t pointer_size, const Visitor& visitor)
+      SHARED_REQUIRES(Locks::mutator_lock_);
 };
 
 }  // namespace mirror
diff --git a/runtime/mirror/class-inl.h b/runtime/mirror/class-inl.h
index 174de0e..9e416dc 100644
--- a/runtime/mirror/class-inl.h
+++ b/runtime/mirror/class-inl.h
@@ -937,6 +937,57 @@
   return arr != nullptr ? arr->size() : 0u;
 }
 
+template <typename Visitor>
+inline void Class::FixupNativePointers(mirror::Class* dest,
+                                       size_t pointer_size,
+                                       const Visitor& visitor) {
+  // Update the field arrays.
+  LengthPrefixedArray<ArtField>* const sfields = GetSFieldsPtr();
+  LengthPrefixedArray<ArtField>* const new_sfields = visitor(sfields);
+  if (sfields != new_sfields) {
+    dest->SetSFieldsPtrUnchecked(new_sfields);
+  }
+  LengthPrefixedArray<ArtField>* const ifields = GetIFieldsPtr();
+  LengthPrefixedArray<ArtField>* const new_ifields = visitor(ifields);
+  if (ifields != new_ifields) {
+    dest->SetIFieldsPtrUnchecked(new_ifields);
+  }
+  // Update direct and virtual method arrays.
+  LengthPrefixedArray<ArtMethod>* direct_methods = GetDirectMethodsPtr();
+  LengthPrefixedArray<ArtMethod>* new_direct_methods = visitor(direct_methods);
+  if (direct_methods != new_direct_methods) {
+    dest->SetDirectMethodsPtrUnchecked(new_direct_methods);
+  }
+  LengthPrefixedArray<ArtMethod>* virtual_methods = GetVirtualMethodsPtr();
+  LengthPrefixedArray<ArtMethod>* new_virtual_methods = visitor(virtual_methods);
+  if (virtual_methods != new_virtual_methods) {
+    dest->SetVirtualMethodsPtr(new_virtual_methods);
+  }
+  // Update dex cache strings.
+  GcRoot<mirror::String>* strings = GetDexCacheStrings();
+  GcRoot<mirror::String>* new_strings = visitor(strings);
+  if (strings != new_strings) {
+    dest->SetDexCacheStrings(new_strings);
+  }
+  // Fix up embedded tables.
+  if (!IsTemp() && ShouldHaveEmbeddedImtAndVTable()) {
+    for (int32_t i = 0, count = GetEmbeddedVTableLength(); i < count; ++i) {
+      ArtMethod* method = GetEmbeddedVTableEntry(i, pointer_size);
+      ArtMethod* new_method = visitor(method);
+      if (method != new_method) {
+        dest->SetEmbeddedVTableEntryUnchecked(i, new_method, pointer_size);
+      }
+    }
+    for (size_t i = 0; i < mirror::Class::kImtSize; ++i) {
+      ArtMethod* method = GetEmbeddedImTableEntry(i, pointer_size);
+      ArtMethod* new_method = visitor(method);
+      if (method != new_method) {
+        dest->SetEmbeddedImTableEntry(i, new_method, pointer_size);
+      }
+    }
+  }
+}
+
 }  // namespace mirror
 }  // namespace art
 
diff --git a/runtime/mirror/class.cc b/runtime/mirror/class.cc
index 3590586..05a9039 100644
--- a/runtime/mirror/class.cc
+++ b/runtime/mirror/class.cc
@@ -802,6 +802,18 @@
   }
 }
 
+mirror::Class* Class::GetCommonSuperClass(Handle<Class> klass) {
+  DCHECK(klass.Get() != nullptr);
+  DCHECK(!klass->IsInterface());
+  DCHECK(!IsInterface());
+  mirror::Class* common_super_class = this;
+  while (!common_super_class->IsAssignableFrom(klass.Get())) {
+    common_super_class = common_super_class->GetSuperClass();
+  }
+  DCHECK(common_super_class != nullptr);
+  return common_super_class;
+}
+
 const char* Class::GetSourceFile() {
   const DexFile& dex_file = GetDexFile();
   const DexFile::ClassDef* dex_class_def = GetClassDef();
diff --git a/runtime/mirror/class.h b/runtime/mirror/class.h
index 80e136c..0ab5b97 100644
--- a/runtime/mirror/class.h
+++ b/runtime/mirror/class.h
@@ -657,6 +657,10 @@
 
   ALWAYS_INLINE Class* GetSuperClass() SHARED_REQUIRES(Locks::mutator_lock_);
 
+  // Get first common super class. It will never return null.
+  // `This` and `klass` must be classes.
+  Class* GetCommonSuperClass(Handle<Class> klass) SHARED_REQUIRES(Locks::mutator_lock_);
+
   void SetSuperClass(Class *new_super_class) SHARED_REQUIRES(Locks::mutator_lock_) {
     // Super class is assigned once, except during class linker initialization.
     Class* old_super_class = GetFieldObject<Class>(OFFSET_OF_OBJECT_MEMBER(Class, super_class_));
@@ -1157,6 +1161,13 @@
   ALWAYS_INLINE LengthPrefixedArray<ArtMethod>* GetVirtualMethodsPtrUnchecked()
       SHARED_REQUIRES(Locks::mutator_lock_);
 
+  // Fix up all of the native pointers in the class by running them through the visitor. Only sets
+  // the corresponding entry in dest if visitor(obj) != obj to prevent dirty memory. Dest should be
+  // initialized to a copy of *this to prevent issues.
+  template <typename Visitor>
+  void FixupNativePointers(mirror::Class* dest, size_t pointer_size, const Visitor& visitor)
+      SHARED_REQUIRES(Locks::mutator_lock_);
+
  private:
   void SetVerifyError(Object* klass) SHARED_REQUIRES(Locks::mutator_lock_);
 
diff --git a/runtime/mirror/dex_cache-inl.h b/runtime/mirror/dex_cache-inl.h
index f8ccfb1..975af61 100644
--- a/runtime/mirror/dex_cache-inl.h
+++ b/runtime/mirror/dex_cache-inl.h
@@ -137,6 +137,32 @@
   }
 }
 
+template <typename Visitor>
+inline void DexCache::FixupStrings(GcRoot<mirror::String>* dest, const Visitor& visitor) {
+  GcRoot<mirror::String>* src = GetStrings();
+  for (size_t i = 0, count = NumStrings(); i < count; ++i) {
+    // TODO: Probably don't need read barrier for most callers.
+    mirror::String* source = src[i].Read();
+    mirror::String* new_source = visitor(source);
+    if (source != new_source) {
+      dest[i] = GcRoot<mirror::String>(new_source);
+    }
+  }
+}
+
+template <typename Visitor>
+inline void DexCache::FixupResolvedTypes(GcRoot<mirror::Class>* dest, const Visitor& visitor) {
+  GcRoot<mirror::Class>* src = GetResolvedTypes();
+  for (size_t i = 0, count = NumResolvedTypes(); i < count; ++i) {
+    // TODO: Probably don't need read barrier for most callers.
+    mirror::Class* source = src[i].Read();
+    mirror::Class* new_source = visitor(source);
+    if (source != new_source) {
+      dest[i] = GcRoot<mirror::Class>(new_source);
+    }
+  }
+}
+
 }  // namespace mirror
 }  // namespace art
 
diff --git a/runtime/mirror/dex_cache.h b/runtime/mirror/dex_cache.h
index 3144553..32eb595 100644
--- a/runtime/mirror/dex_cache.h
+++ b/runtime/mirror/dex_cache.h
@@ -61,6 +61,14 @@
   void Fixup(ArtMethod* trampoline, size_t pointer_size)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
+  template <typename Visitor>
+  void FixupStrings(GcRoot<mirror::String>* dest, const Visitor& visitor)
+      SHARED_REQUIRES(Locks::mutator_lock_);
+
+  template <typename Visitor>
+  void FixupResolvedTypes(GcRoot<mirror::Class>* dest, const Visitor& visitor)
+      SHARED_REQUIRES(Locks::mutator_lock_);
+
   String* GetLocation() SHARED_REQUIRES(Locks::mutator_lock_) {
     return GetFieldObject<String>(OFFSET_OF_OBJECT_MEMBER(DexCache, location_));
   }
diff --git a/runtime/stack.cc b/runtime/stack.cc
index 88978bf..9098d38 100644
--- a/runtime/stack.cc
+++ b/runtime/stack.cc
@@ -265,7 +265,12 @@
     }
   } else {
     DCHECK(cur_shadow_frame_ != nullptr);
-    *val = cur_shadow_frame_->GetVReg(vreg);
+    if (kind == kReferenceVReg) {
+      *val = static_cast<uint32_t>(reinterpret_cast<uintptr_t>(
+          cur_shadow_frame_->GetVRegReference(vreg)));
+    } else {
+      *val = cur_shadow_frame_->GetVReg(vreg);
+    }
     return true;
   }
 }
@@ -481,52 +486,10 @@
   return true;
 }
 
-bool StackVisitor::SetVReg(ArtMethod* m, uint16_t vreg, uint32_t new_value,
+bool StackVisitor::SetVReg(ArtMethod* m,
+                           uint16_t vreg,
+                           uint32_t new_value,
                            VRegKind kind) {
-  if (cur_quick_frame_ != nullptr) {
-    DCHECK(context_ != nullptr);  // You can't reliably write registers without a context.
-    DCHECK(m == GetMethod());
-    if (cur_oat_quick_method_header_->IsOptimized()) {
-      return false;
-    } else {
-      return SetVRegFromQuickCode(m, vreg, new_value, kind);
-    }
-  } else {
-    cur_shadow_frame_->SetVReg(vreg, new_value);
-    return true;
-  }
-}
-
-bool StackVisitor::SetVRegFromQuickCode(ArtMethod* m, uint16_t vreg, uint32_t new_value,
-                                        VRegKind kind) {
-  DCHECK(context_ != nullptr);  // You can't reliably write registers without a context.
-  DCHECK(m == GetMethod());
-  const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader();
-  QuickMethodFrameInfo frame_info = method_header->GetFrameInfo();
-  const VmapTable vmap_table(method_header->GetVmapTable());
-  uint32_t vmap_offset;
-  // TODO: IsInContext stops before spotting floating point registers.
-  if (vmap_table.IsInContext(vreg, kind, &vmap_offset)) {
-    bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg);
-    uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask();
-    uint32_t reg = vmap_table.ComputeRegister(spill_mask, vmap_offset, kind);
-    return SetRegisterIfAccessible(reg, new_value, kind);
-  } else {
-    const DexFile::CodeItem* code_item = m->GetCodeItem();
-    DCHECK(code_item != nullptr) << PrettyMethod(m);  // Can't be null or how would we compile
-                                                      // its instructions?
-    uint32_t* addr = GetVRegAddrFromQuickCode(
-        cur_quick_frame_, code_item, frame_info.CoreSpillMask(),
-        frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg);
-    *addr = new_value;
-    return true;
-  }
-}
-
-bool StackVisitor::SetVRegFromDebugger(ArtMethod* m,
-                                       uint16_t vreg,
-                                       uint32_t new_value,
-                                       VRegKind kind) {
   const DexFile::CodeItem* code_item = m->GetCodeItem();
   if (code_item == nullptr) {
     return false;
@@ -551,93 +514,11 @@
   return true;
 }
 
-bool StackVisitor::SetRegisterIfAccessible(uint32_t reg, uint32_t new_value, VRegKind kind) {
-  const bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg);
-  if (!IsAccessibleRegister(reg, is_float)) {
-    return false;
-  }
-  const bool target64 = Is64BitInstructionSet(kRuntimeISA);
-
-  // Create a new value that can hold both low 32 and high 32 bits, in
-  // case we are running 64 bits.
-  uintptr_t full_new_value = new_value;
-  // Deal with 32 or 64-bit wide registers in a way that builds on all targets.
-  if (target64) {
-    bool wide_lo = (kind == kLongLoVReg) || (kind == kDoubleLoVReg);
-    bool wide_hi = (kind == kLongHiVReg) || (kind == kDoubleHiVReg);
-    if (wide_lo || wide_hi) {
-      uintptr_t old_reg_val = GetRegister(reg, is_float);
-      uint64_t new_vreg_portion = static_cast<uint64_t>(new_value);
-      uint64_t old_reg_val_as_wide = static_cast<uint64_t>(old_reg_val);
-      uint64_t mask = 0xffffffff;
-      if (wide_lo) {
-        mask = mask << 32;
-      } else {
-        new_vreg_portion = new_vreg_portion << 32;
-      }
-      full_new_value = static_cast<uintptr_t>((old_reg_val_as_wide & mask) | new_vreg_portion);
-    }
-  }
-  SetRegister(reg, full_new_value, is_float);
-  return true;
-}
-
-bool StackVisitor::SetVRegPair(ArtMethod* m, uint16_t vreg, uint64_t new_value,
-                               VRegKind kind_lo, VRegKind kind_hi) {
-  if (kind_lo == kLongLoVReg) {
-    DCHECK_EQ(kind_hi, kLongHiVReg);
-  } else if (kind_lo == kDoubleLoVReg) {
-    DCHECK_EQ(kind_hi, kDoubleHiVReg);
-  } else {
-    LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi;
-  }
-  if (cur_quick_frame_ != nullptr) {
-    DCHECK(context_ != nullptr);  // You can't reliably write registers without a context.
-    DCHECK(m == GetMethod());
-    if (cur_oat_quick_method_header_->IsOptimized()) {
-      return false;
-    } else {
-      return SetVRegPairFromQuickCode(m, vreg, new_value, kind_lo, kind_hi);
-    }
-  } else {
-    DCHECK(cur_shadow_frame_ != nullptr);
-    cur_shadow_frame_->SetVRegLong(vreg, new_value);
-    return true;
-  }
-}
-
-bool StackVisitor::SetVRegPairFromQuickCode(
-    ArtMethod* m, uint16_t vreg, uint64_t new_value, VRegKind kind_lo, VRegKind kind_hi) {
-  DCHECK_EQ(m, GetMethod());
-  const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader();
-  QuickMethodFrameInfo frame_info = method_header->GetFrameInfo();
-  const VmapTable vmap_table(method_header->GetVmapTable());
-  uint32_t vmap_offset_lo, vmap_offset_hi;
-  // TODO: IsInContext stops before spotting floating point registers.
-  if (vmap_table.IsInContext(vreg, kind_lo, &vmap_offset_lo) &&
-      vmap_table.IsInContext(vreg + 1, kind_hi, &vmap_offset_hi)) {
-    bool is_float = (kind_lo == kDoubleLoVReg);
-    uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask();
-    uint32_t reg_lo = vmap_table.ComputeRegister(spill_mask, vmap_offset_lo, kind_lo);
-    uint32_t reg_hi = vmap_table.ComputeRegister(spill_mask, vmap_offset_hi, kind_hi);
-    return SetRegisterPairIfAccessible(reg_lo, reg_hi, new_value, is_float);
-  } else {
-    const DexFile::CodeItem* code_item = m->GetCodeItem();
-    DCHECK(code_item != nullptr) << PrettyMethod(m);  // Can't be null or how would we compile
-                                                      // its instructions?
-    uint32_t* addr = GetVRegAddrFromQuickCode(
-        cur_quick_frame_, code_item, frame_info.CoreSpillMask(),
-        frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg);
-    *reinterpret_cast<uint64_t*>(addr) = new_value;
-    return true;
-  }
-}
-
-bool StackVisitor::SetVRegPairFromDebugger(ArtMethod* m,
-                                           uint16_t vreg,
-                                           uint64_t new_value,
-                                           VRegKind kind_lo,
-                                           VRegKind kind_hi) {
+bool StackVisitor::SetVRegPair(ArtMethod* m,
+                               uint16_t vreg,
+                               uint64_t new_value,
+                               VRegKind kind_lo,
+                               VRegKind kind_hi) {
   if (kind_lo == kLongLoVReg) {
     DCHECK_EQ(kind_hi, kLongHiVReg);
   } else if (kind_lo == kDoubleLoVReg) {
@@ -666,25 +547,6 @@
   return true;
 }
 
-bool StackVisitor::SetRegisterPairIfAccessible(uint32_t reg_lo, uint32_t reg_hi,
-                                               uint64_t new_value, bool is_float) {
-  if (!IsAccessibleRegister(reg_lo, is_float) || !IsAccessibleRegister(reg_hi, is_float)) {
-    return false;
-  }
-  uintptr_t new_value_lo = static_cast<uintptr_t>(new_value & 0xFFFFFFFF);
-  uintptr_t new_value_hi = static_cast<uintptr_t>(new_value >> 32);
-  bool target64 = Is64BitInstructionSet(kRuntimeISA);
-  // Deal with 32 or 64-bit wide registers in a way that builds on all targets.
-  if (target64) {
-    DCHECK_EQ(reg_lo, reg_hi);
-    SetRegister(reg_lo, new_value, is_float);
-  } else {
-    SetRegister(reg_lo, new_value_lo, is_float);
-    SetRegister(reg_hi, new_value_hi, is_float);
-  }
-  return true;
-}
-
 bool StackVisitor::IsAccessibleGPR(uint32_t reg) const {
   DCHECK(context_ != nullptr);
   return context_->IsAccessibleGPR(reg);
@@ -702,12 +564,6 @@
   return context_->GetGPR(reg);
 }
 
-void StackVisitor::SetGPR(uint32_t reg, uintptr_t value) {
-  DCHECK(cur_quick_frame_ != nullptr) << "This is a quick frame routine";
-  DCHECK(context_ != nullptr);
-  context_->SetGPR(reg, value);
-}
-
 bool StackVisitor::IsAccessibleFPR(uint32_t reg) const {
   DCHECK(context_ != nullptr);
   return context_->IsAccessibleFPR(reg);
@@ -719,12 +575,6 @@
   return context_->GetFPR(reg);
 }
 
-void StackVisitor::SetFPR(uint32_t reg, uintptr_t value) {
-  DCHECK(cur_quick_frame_ != nullptr) << "This is a quick frame routine";
-  DCHECK(context_ != nullptr);
-  context_->SetFPR(reg, value);
-}
-
 uintptr_t StackVisitor::GetReturnPc() const {
   uint8_t* sp = reinterpret_cast<uint8_t*>(GetCurrentQuickFrame());
   DCHECK(sp != nullptr);
diff --git a/runtime/stack.h b/runtime/stack.h
index aa7b616..a0c44cb 100644
--- a/runtime/stack.h
+++ b/runtime/stack.h
@@ -600,22 +600,18 @@
                    uint64_t* val) const
       SHARED_REQUIRES(Locks::mutator_lock_);
 
+  // Values will be set in debugger shadow frames. Debugger will make sure deoptimization
+  // is triggered to make the values effective.
   bool SetVReg(ArtMethod* m, uint16_t vreg, uint32_t new_value, VRegKind kind)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Values will be set in debugger shadow frames. Debugger will make sure deoptimization
   // is triggered to make the values effective.
-  bool SetVRegFromDebugger(ArtMethod* m, uint16_t vreg, uint32_t new_value, VRegKind kind)
-      SHARED_REQUIRES(Locks::mutator_lock_);
-
-  bool SetVRegPair(ArtMethod* m, uint16_t vreg, uint64_t new_value,
-                   VRegKind kind_lo, VRegKind kind_hi)
-      SHARED_REQUIRES(Locks::mutator_lock_);
-
-  // Values will be set in debugger shadow frames. Debugger will make sure deoptimization
-  // is triggered to make the values effective.
-  bool SetVRegPairFromDebugger(ArtMethod* m, uint16_t vreg, uint64_t new_value,
-                               VRegKind kind_lo, VRegKind kind_hi)
+  bool SetVRegPair(ArtMethod* m,
+                   uint16_t vreg,
+                   uint64_t new_value,
+                   VRegKind kind_lo,
+                   VRegKind kind_hi)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   uintptr_t* GetGPRAddress(uint32_t reg) const;
@@ -749,22 +745,12 @@
     DCHECK(IsAccessibleRegister(reg, is_float));
     return is_float ? GetFPR(reg) : GetGPR(reg);
   }
-  void SetRegister(uint32_t reg, uintptr_t value, bool is_float) {
-    DCHECK(IsAccessibleRegister(reg, is_float));
-    if (is_float) {
-      SetFPR(reg, value);
-    } else {
-      SetGPR(reg, value);
-    }
-  }
 
   bool IsAccessibleGPR(uint32_t reg) const;
   uintptr_t GetGPR(uint32_t reg) const;
-  void SetGPR(uint32_t reg, uintptr_t value);
 
   bool IsAccessibleFPR(uint32_t reg) const;
   uintptr_t GetFPR(uint32_t reg) const;
-  void SetFPR(uint32_t reg, uintptr_t value);
 
   bool GetVRegFromDebuggerShadowFrame(uint16_t vreg, VRegKind kind, uint32_t* val) const
       SHARED_REQUIRES(Locks::mutator_lock_);
@@ -789,19 +775,6 @@
                                    uint64_t* val) const
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  bool SetVRegFromQuickCode(ArtMethod* m, uint16_t vreg, uint32_t new_value,
-                            VRegKind kind)
-      SHARED_REQUIRES(Locks::mutator_lock_);
-  bool SetRegisterIfAccessible(uint32_t reg, uint32_t new_value, VRegKind kind)
-      SHARED_REQUIRES(Locks::mutator_lock_);
-
-  bool SetVRegPairFromQuickCode(ArtMethod* m, uint16_t vreg, uint64_t new_value,
-                                VRegKind kind_lo, VRegKind kind_hi)
-      SHARED_REQUIRES(Locks::mutator_lock_);
-  bool SetRegisterPairIfAccessible(uint32_t reg_lo, uint32_t reg_hi, uint64_t new_value,
-                                   bool is_float)
-      SHARED_REQUIRES(Locks::mutator_lock_);
-
   void SanityCheckFrame() const SHARED_REQUIRES(Locks::mutator_lock_);
 
   InlineInfo GetCurrentInlineInfo() const SHARED_REQUIRES(Locks::mutator_lock_);
diff --git a/test/450-checker-types/src/Main.java b/test/450-checker-types/src/Main.java
index cd5e5a7..ec63057 100644
--- a/test/450-checker-types/src/Main.java
+++ b/test/450-checker-types/src/Main.java
@@ -14,17 +14,22 @@
  * limitations under the License.
  */
 
-interface Interface {
+interface SuperInterface {
+  void superInterfaceMethod();
+}
+
+interface OtherInterface extends SuperInterface {
+}
+
+interface Interface extends SuperInterface {
   void $noinline$f();
 }
 
 class Super implements Interface {
+  public void superInterfaceMethod() {}
   public void $noinline$f() {
     throw new RuntimeException();
   }
-
-  public int instanceField;
-
 }
 
 class SubclassA extends Super {
@@ -551,40 +556,30 @@
   private void argumentCheck(Super s, double d, SubclassA a, Final f) {
   }
 
-  /// CHECK-START: Main Main.getMain(boolean) reference_type_propagation (after)
-  /// CHECK:      <<Phi:l\d+>>       Phi klass:Main
-  /// CHECK:                         Return [<<Phi>>]
-  private Main getMain(boolean cond) {
-    return cond ? null : new Main();
-  }
-
-  /// CHECK-START: Super Main.getSuper(boolean, SubclassA, SubclassB) reference_type_propagation (after)
-  /// CHECK:      <<Phi:l\d+>>       Phi klass:java.lang.Object
-  /// CHECK:                         Return [<<Phi>>]
-  private Super getSuper(boolean cond, SubclassA a, SubclassB b) {
-    return cond ? a : b;
-  }
-
   private Main getNull() {
     return null;
   }
 
   private int mainField = 0;
 
-  /// CHECK-START: void Main.testInlinerWidensReturnType(boolean, SubclassA, SubclassB) inliner (before)
-  /// CHECK:      <<Int:i\d+>>       IntConstant 0
-  /// CHECK:      <<Invoke:l\d+>>    InvokeStaticOrDirect klass:Super
-  /// CHECK:      <<NullCheck:l\d+>> NullCheck [<<Invoke>>] klass:Super exact:false
-  /// CHECK:                         InstanceFieldSet [<<NullCheck>>,<<Int>>]
-
-  /// CHECK-START: void Main.testInlinerWidensReturnType(boolean, SubclassA, SubclassB) inliner (after)
-  /// CHECK:      <<Int:i\d+>>       IntConstant 0
+  /// CHECK-START: SuperInterface Main.getWiderType(boolean, Interface, OtherInterface) reference_type_propagation (after)
   /// CHECK:      <<Phi:l\d+>>       Phi klass:java.lang.Object
-  /// CHECK:      <<NullCheck:l\d+>> NullCheck [<<Phi>>] klass:Super exact:false
-  /// CHECK:                         InstanceFieldSet [<<NullCheck>>,<<Int>>]
-  private void testInlinerWidensReturnType(boolean cond, SubclassA a, SubclassB b) {
-    Super o = getSuper(cond, a, b);
-    o.instanceField = 0;
+  /// CHECK:                         Return [<<Phi>>]
+  private SuperInterface getWiderType(boolean cond, Interface a, OtherInterface b) {
+    return cond ? a : b;
+  }
+
+  /// CHECK-START: void Main.testInlinerWidensReturnType(boolean, Interface, OtherInterface) inliner (before)
+  /// CHECK:      <<Invoke:l\d+>>    InvokeStaticOrDirect klass:SuperInterface
+  /// CHECK:      <<NullCheck:l\d+>> NullCheck [<<Invoke>>] klass:SuperInterface exact:false
+  /// CHECK:                         InvokeInterface [<<NullCheck>>]
+
+  /// CHECK-START: void Main.testInlinerWidensReturnType(boolean, Interface, OtherInterface) inliner (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:java.lang.Object
+  /// CHECK:      <<NullCheck:l\d+>> NullCheck [<<Phi>>] klass:SuperInterface exact:false
+  /// CHECK:                         InvokeInterface [<<NullCheck>>]
+  private void testInlinerWidensReturnType(boolean cond, Interface a, OtherInterface b) {
+    getWiderType(cond, a, b).superInterfaceMethod();
   }
 
   /// CHECK-START: void Main.testInlinerReturnsNull() inliner (before)
diff --git a/test/455-set-vreg/expected.txt b/test/455-set-vreg/expected.txt
deleted file mode 100644
index 6a5618e..0000000
--- a/test/455-set-vreg/expected.txt
+++ /dev/null
@@ -1 +0,0 @@
-JNI_OnLoad called
diff --git a/test/455-set-vreg/info.txt b/test/455-set-vreg/info.txt
deleted file mode 100644
index e8c57b5..0000000
--- a/test/455-set-vreg/info.txt
+++ /dev/null
@@ -1 +0,0 @@
-Tests for setting DEX registers in a Java method.
diff --git a/test/455-set-vreg/set_vreg_jni.cc b/test/455-set-vreg/set_vreg_jni.cc
deleted file mode 100644
index 21149f6..0000000
--- a/test/455-set-vreg/set_vreg_jni.cc
+++ /dev/null
@@ -1,96 +0,0 @@
-/*
- * Copyright (C) 2015 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.
- */
-
-#include "arch/context.h"
-#include "art_method-inl.h"
-#include "jni.h"
-#include "scoped_thread_state_change.h"
-#include "stack.h"
-#include "thread.h"
-
-namespace art {
-
-namespace {
-
-class TestVisitor : public StackVisitor {
- public:
-  TestVisitor(Thread* thread, Context* context, mirror::Object* this_value)
-      SHARED_REQUIRES(Locks::mutator_lock_)
-      : StackVisitor(thread, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames),
-        this_value_(this_value) {}
-
-  bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) {
-    ArtMethod* m = GetMethod();
-    std::string m_name(m->GetName());
-
-    if (m_name.compare("testIntVReg") == 0) {
-      uint32_t value = 0;
-      CHECK(GetVReg(m, 1, kReferenceVReg, &value));
-      CHECK_EQ(reinterpret_cast<mirror::Object*>(value), this_value_);
-
-      CHECK(SetVReg(m, 2, 5, kIntVReg));
-      CHECK(SetVReg(m, 3, 4, kIntVReg));
-      CHECK(SetVReg(m, 4, 3, kIntVReg));
-      CHECK(SetVReg(m, 5, 2, kIntVReg));
-      CHECK(SetVReg(m, 6, 1, kIntVReg));
-    } else if (m_name.compare("testLongVReg") == 0) {
-      uint32_t value = 0;
-      CHECK(GetVReg(m, 3, kReferenceVReg, &value));
-      CHECK_EQ(reinterpret_cast<mirror::Object*>(value), this_value_);
-
-      CHECK(SetVRegPair(m, 4, std::numeric_limits<int64_t>::max(), kLongLoVReg, kLongHiVReg));
-      CHECK(SetVRegPair(m, 6, 4, kLongLoVReg, kLongHiVReg));
-      CHECK(SetVRegPair(m, 8, 3, kLongLoVReg, kLongHiVReg));
-      CHECK(SetVRegPair(m, 10, 2, kLongLoVReg, kLongHiVReg));
-      CHECK(SetVRegPair(m, 12, 1, kLongLoVReg, kLongHiVReg));
-    } else if (m_name.compare("testFloatVReg") == 0) {
-      uint32_t value = 0;
-      CHECK(GetVReg(m, 1, kReferenceVReg, &value));
-      CHECK_EQ(reinterpret_cast<mirror::Object*>(value), this_value_);
-
-      CHECK(SetVReg(m, 2, bit_cast<uint32_t, float>(5.0f), kFloatVReg));
-      CHECK(SetVReg(m, 3, bit_cast<uint32_t, float>(4.0f), kFloatVReg));
-      CHECK(SetVReg(m, 4, bit_cast<uint32_t, float>(3.0f), kFloatVReg));
-      CHECK(SetVReg(m, 5, bit_cast<uint32_t, float>(2.0f), kFloatVReg));
-      CHECK(SetVReg(m, 6, bit_cast<uint32_t, float>(1.0f), kFloatVReg));
-    } else if (m_name.compare("testDoubleVReg") == 0) {
-      uint32_t value = 0;
-      CHECK(GetVReg(m, 3, kReferenceVReg, &value));
-      CHECK_EQ(reinterpret_cast<mirror::Object*>(value), this_value_);
-
-      CHECK(SetVRegPair(m, 4, bit_cast<uint64_t, double>(5.0), kDoubleLoVReg, kDoubleHiVReg));
-      CHECK(SetVRegPair(m, 6, bit_cast<uint64_t, double>(4.0), kDoubleLoVReg, kDoubleHiVReg));
-      CHECK(SetVRegPair(m, 8, bit_cast<uint64_t, double>(3.0), kDoubleLoVReg, kDoubleHiVReg));
-      CHECK(SetVRegPair(m, 10, bit_cast<uint64_t, double>(2.0), kDoubleLoVReg, kDoubleHiVReg));
-      CHECK(SetVRegPair(m, 12, bit_cast<uint64_t, double>(1.0), kDoubleLoVReg, kDoubleHiVReg));
-    }
-
-    return true;
-  }
-
-  mirror::Object* this_value_;
-};
-
-extern "C" JNIEXPORT void JNICALL Java_Main_doNativeCallSetVReg(JNIEnv*, jobject value) {
-  ScopedObjectAccess soa(Thread::Current());
-  std::unique_ptr<Context> context(Context::Create());
-  TestVisitor visitor(soa.Self(), context.get(), soa.Decode<mirror::Object*>(value));
-  visitor.WalkStack();
-}
-
-}  // namespace
-
-}  // namespace art
diff --git a/test/455-set-vreg/src/Main.java b/test/455-set-vreg/src/Main.java
deleted file mode 100644
index 4db9d66..0000000
--- a/test/455-set-vreg/src/Main.java
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * Copyright (C) 2015 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.
- */
-
-public class Main {
-  public Main() {
-  }
-
-  int testIntVReg(int a, int b, int c, int d, int e) {
-    doNativeCallSetVReg();
-    return a - b - c - d - e;
-  }
-
-  long testLongVReg(long a, long b, long c, long d, long e) {
-    doNativeCallSetVReg();
-    return a - b - c - d - e;
-  }
-
-  float testFloatVReg(float a, float b, float c, float d, float e) {
-    doNativeCallSetVReg();
-    return a - b - c - d - e;
-  }
-
-  double testDoubleVReg(double a, double b, double c, double d, double e) {
-    doNativeCallSetVReg();
-    return a - b - c - d - e;
-  }
-
-  native void doNativeCallSetVReg();
-
-  public static void main(String[] args) {
-    System.loadLibrary(args[0]);
-    Main rm = new Main();
-    int intExpected = 5 - 4 - 3 - 2 - 1;
-    int intResult = rm.testIntVReg(0, 0, 0, 0, 0);
-    if (intResult != intExpected) {
-      throw new Error("Expected " + intExpected + ", got " + intResult);
-    }
-
-    long longExpected = Long.MAX_VALUE - 4 - 3 - 2 - 1;
-    long longResult = rm.testLongVReg(0, 0, 0, 0, 0);
-    if (longResult != longExpected) {
-      throw new Error("Expected " + longExpected + ", got " + longResult);
-    }
-
-    float floatExpected = 5.0f - 4.0f - 3.0f - 2.0f - 1.0f;
-    float floatResult = rm.testFloatVReg(0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
-    if (floatResult != floatExpected) {
-      throw new Error("Expected " + floatExpected + ", got " + floatResult);
-    }
-
-    double doubleExpected = 5.0 - 4.0 - 3.0 - 2.0 - 1.0;
-    double doubleResult = rm.testDoubleVReg(0.0, 0.0, 0.0, 0.0, 0.0);
-    if (doubleResult != doubleExpected) {
-      throw new Error("Expected " + doubleExpected + ", got " + doubleResult);
-    }
-  }
-}
diff --git a/test/457-regs/regs_jni.cc b/test/457-regs/regs_jni.cc
index 64b2336..79fa8b0 100644
--- a/test/457-regs/regs_jni.cc
+++ b/test/457-regs/regs_jni.cc
@@ -68,7 +68,7 @@
         CHECK(!success);
       }
 
-      CHECK(GetVReg(m, 3, kReferenceVReg, &value));
+      CHECK(GetVReg(m, 3, kIntVReg, &value));
       CHECK_EQ(value, 1u);
 
       CHECK(GetVReg(m, 4, kFloatVReg, &value));
diff --git a/test/549-checker-types-merge/expected.txt b/test/549-checker-types-merge/expected.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/549-checker-types-merge/expected.txt
diff --git a/test/549-checker-types-merge/info.txt b/test/549-checker-types-merge/info.txt
new file mode 100644
index 0000000..f174e20
--- /dev/null
+++ b/test/549-checker-types-merge/info.txt
@@ -0,0 +1 @@
+Checker test for testing the type merge during reference type propagation.
diff --git a/test/549-checker-types-merge/src/Main.java b/test/549-checker-types-merge/src/Main.java
new file mode 100644
index 0000000..dc27f10
--- /dev/null
+++ b/test/549-checker-types-merge/src/Main.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+// To make it easier to follow the tests:
+//  - all interfaces defined in this file extend InterfaceSuper (except InterfaceOtherSuper)
+//  - all classes defined in this file extend ClassSuper (except ClassOtherSuper)
+
+interface InterfaceSuper {}
+interface InterfaceOtherSuper {}
+
+interface InterfaceA extends InterfaceSuper {}
+interface InterfaceB extends InterfaceSuper {}
+interface InterfaceExtendsA extends InterfaceA {}
+interface InterfaceExtendsB extends InterfaceB {}
+
+class ClassSuper {}
+class ClassOtherSuper {}
+
+class ClassA extends ClassSuper {}
+class ClassB extends ClassSuper {}
+class ClassExtendsA extends ClassA {}
+class ClassExtendsB extends ClassB {}
+
+class ClassImplementsInterfaceA extends ClassSuper implements InterfaceA {}
+
+public class Main {
+
+  /// CHECK-START: java.lang.Object Main.testMergeNullContant(boolean) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:Main
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeNullContant(boolean cond) {
+    return cond ? null : new Main();
+  }
+
+  /// CHECK-START: java.lang.Object Main.testMergeClasses(boolean, ClassExtendsA, ClassExtendsB) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:ClassSuper
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeClasses(boolean cond, ClassExtendsA a, ClassExtendsB b) {
+    // Different classes, have a common super type.
+    return cond ? a : b;
+  }
+
+  /// CHECK-START: java.lang.Object Main.testMergeClasses(boolean, ClassExtendsA, ClassSuper) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:ClassSuper
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeClasses(boolean cond, ClassExtendsA a, ClassSuper b) {
+    // Different classes, one is the super type of the other.
+    return cond ? a : b;
+  }
+
+  /// CHECK-START: java.lang.Object Main.testMergeClasses(boolean, ClassSuper, ClassSuper) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:ClassSuper
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeClasses(boolean cond, ClassSuper a, ClassSuper b) {
+    // Same classes.
+    return cond ? a : b;
+  }
+
+  /// CHECK-START: java.lang.Object Main.testMergeClasses(boolean, ClassOtherSuper, ClassSuper) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:java.lang.Object
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeClasses(boolean cond, ClassOtherSuper a, ClassSuper b) {
+    // Different classes, have Object as the common super type.
+    return cond ? a : b;
+  }
+
+  /// CHECK-START: java.lang.Object Main.testMergeClassWithInterface(boolean, ClassImplementsInterfaceA, InterfaceSuper) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:InterfaceSuper
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeClassWithInterface(boolean cond, ClassImplementsInterfaceA a, InterfaceSuper b) {
+    // Class implements interface.
+    return cond ? a : b;
+  }
+
+  /// CHECK-START: java.lang.Object Main.testMergeClassWithInterface(boolean, ClassSuper, InterfaceSuper) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:java.lang.Object
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeClassWithInterface(boolean cond, ClassSuper a, InterfaceSuper b) {
+    // Class doesn't implement interface.
+    return cond ? a : b;
+  }
+
+  /// CHECK-START: java.lang.Object Main.testMergeInterfaces(boolean, InterfaceExtendsA, InterfaceSuper) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:InterfaceSuper
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeInterfaces(boolean cond, InterfaceExtendsA a, InterfaceSuper b) {
+    // Different Interfaces, one implements the other.
+    return cond ? a : b;
+  }
+
+  /// CHECK-START: java.lang.Object Main.testMergeInterfaces(boolean, InterfaceSuper, InterfaceSuper) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:InterfaceSuper
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeInterfaces(boolean cond, InterfaceSuper a, InterfaceSuper b) {
+    // Same interfaces.
+    return cond ? a : b;
+  }
+
+  /// CHECK-START: java.lang.Object Main.testMergeInterfaces(boolean, InterfaceExtendsA, InterfaceExtendsB) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:java.lang.Object
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeInterfaces(boolean cond, InterfaceExtendsA a, InterfaceExtendsB b) {
+    // Different Interfaces, have a common super type.
+    return cond ? a : b;
+  }
+
+    /// CHECK-START: java.lang.Object Main.testMergeInterfaces(boolean, InterfaceSuper, InterfaceOtherSuper) reference_type_propagation (after)
+  /// CHECK:      <<Phi:l\d+>>       Phi klass:java.lang.Object
+  /// CHECK:                         Return [<<Phi>>]
+  private Object testMergeInterfaces(boolean cond, InterfaceSuper a, InterfaceOtherSuper b) {
+    // Different interfaces.
+    return cond ? a : b;
+  }
+
+  public static void main(String[] args) {
+  }
+}
diff --git a/test/Android.libarttest.mk b/test/Android.libarttest.mk
index bffd0e0..7a22e1b 100644
--- a/test/Android.libarttest.mk
+++ b/test/Android.libarttest.mk
@@ -34,7 +34,6 @@
   139-register-natives/regnative.cc \
   141-class-unload/jni_unload.cc \
   454-get-vreg/get_vreg_jni.cc \
-  455-set-vreg/set_vreg_jni.cc \
   457-regs/regs_jni.cc \
   461-get-reference-vreg/get_reference_vreg_jni.cc \
   466-get-live-vreg/get_live_vreg_jni.cc \
diff --git a/test/Android.run-test.mk b/test/Android.run-test.mk
index 3e97b86..c830ad4 100644
--- a/test/Android.run-test.mk
+++ b/test/Android.run-test.mk
@@ -464,18 +464,6 @@
 
 TEST_ART_BROKEN_OPTIMIZING_MIPS_RUN_TESTS :=
 
-# Known broken tests for the optimizing compiler.
-TEST_ART_BROKEN_OPTIMIZING_RUN_TESTS := \
-  455-set-vreg \
-
-ifneq (,$(filter optimizing,$(COMPILER_TYPES)))
-  ART_TEST_KNOWN_BROKEN += $(call all-run-test-names,$(TARGET_TYPES),$(RUN_TYPES),$(PREBUILD_TYPES), \
-      optimizing,$(RELOCATE_TYPES),$(TRACE_TYPES),$(GC_TYPES),$(JNI_TYPES), \
-      $(IMAGE_TYPES),$(PICTEST_TYPES),$(DEBUGGABLE_TYPES),$(TEST_ART_BROKEN_OPTIMIZING_RUN_TESTS),$(ALL_ADDRESS_SIZES))
-endif
-
-TEST_ART_BROKEN_OPTIMIZING_RUN_TESTS :=
-
 # Tests that should fail when the optimizing compiler compiles them non-debuggable.
 TEST_ART_BROKEN_OPTIMIZING_NONDEBUGGABLE_RUN_TESTS := \
   454-get-vreg \