[stubs] KeyedLoadIC_Megamorphic: inline fast-property lookups

src/ic/ic.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ic/ic.h"
 
 #include "src/accessors.h"
 #include "src/api-arguments-inl.h"
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 1408 matching lines @@
 
   uint32_t index;
   if ((key->IsInternalizedString() &&
        !String::cast(*key)->AsArrayIndex(&index)) ||
       key->IsSymbol()) {
     ASSIGN_RETURN_ON_EXCEPTION(isolate(), load_handle,
                                LoadIC::Load(object, Handle<Name>::cast(key)),
                                Object);
   } else if (FLAG_use_ic && !object->IsAccessCheckNeeded() &&
              !object->IsJSValue()) {
-    if (object->IsJSObject() || (object->IsString() && key->IsNumber())) {
-      Handle<HeapObject> receiver = Handle<HeapObject>::cast(object);
-      if (object->IsString() || key->IsSmi()) UpdateLoadElement(receiver);
+    if ((object->IsJSObject() && key->IsSmi()) ||
+        (object->IsString() && key->IsNumber())) {
+      UpdateLoadElement(Handle<HeapObject>::cast(object));
+      TRACE_IC("LoadIC", key);
     }
   }
 
   if (!is_vector_set()) {
     ConfigureVectorState(MEGAMORPHIC, key);
     TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "set generic");
   }
-  TRACE_IC("LoadIC", key);
 
   if (!load_handle.is_null()) return load_handle;
 
   Handle<Object> result;
   ASSIGN_RETURN_ON_EXCEPTION(isolate(), result,
                              Runtime::GetObjectProperty(isolate(), object, key),
                              Object);
   return result;
 }
 
@@ skipping 1547 matching lines @@
     DCHECK_EQ(FeedbackVectorSlotKind::KEYED_LOAD_IC,
               vector->GetKind(vector_slot));
     KeyedLoadICNexus nexus(vector, vector_slot);
     KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
     ic.UpdateState(receiver, key);
     RETURN_RESULT_OR_FAILURE(isolate, ic.Load(receiver, key));
   }
 }
 }  // namespace internal
 }  // namespace v8