Removing FLAG_vector_ics.

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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/bits.h"
@@ skipping 479 matching lines @@
 
 void IC::Clear(Isolate* isolate, Address address,
                ConstantPoolArray* constant_pool) {
   Code* target = GetTargetAtAddress(address, constant_pool);
 
   // Don't clear debug break inline cache as it will remove the break point.
   if (target->is_debug_stub()) return;
 
   switch (target->kind()) {
     case Code::LOAD_IC:
-      if (FLAG_vector_ics) return;
-      return LoadIC::Clear(isolate, address, target, constant_pool);
     case Code::KEYED_LOAD_IC:
-      if (FLAG_vector_ics) return;
-      return KeyedLoadIC::Clear(isolate, address, target, constant_pool);
+      return;
     case Code::STORE_IC:
       return StoreIC::Clear(isolate, address, target, constant_pool);
     case Code::KEYED_STORE_IC:
       return KeyedStoreIC::Clear(isolate, address, target, constant_pool);
     case Code::COMPARE_IC:
       return CompareIC::Clear(isolate, address, target, constant_pool);
     case Code::COMPARE_NIL_IC:
       return CompareNilIC::Clear(address, target, constant_pool);
     case Code::CALL_IC:  // CallICs are vector-based and cleared differently.
     case Code::BINARY_OP_IC:
     case Code::TO_BOOLEAN_IC:
       // Clearing these is tricky and does not
       // make any performance difference.
       return;
     default:
       UNREACHABLE();
   }
 }
 
 
-void KeyedLoadIC::Clear(Isolate* isolate, Address address, Code* target,
-                        ConstantPoolArray* constant_pool) {
-  DCHECK(!FLAG_vector_ics);
-  if (IsCleared(target)) return;
-
-  // Make sure to also clear the map used in inline fast cases.  If we
-  // do not clear these maps, cached code can keep objects alive
-  // through the embedded maps.
-  SetTargetAtAddress(address, *pre_monomorphic_stub(isolate), constant_pool);
-}
-
-
 void KeyedLoadIC::Clear(Isolate* isolate, Code* host, KeyedLoadICNexus* nexus) {
   if (IsCleared(nexus)) return;
   // Make sure to also clear the map used in inline fast cases.  If we
   // do not clear these maps, cached code can keep objects alive
   // through the embedded maps.
   State state = nexus->StateFromFeedback();
   nexus->ConfigurePremonomorphic();
   OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, PREMONOMORPHIC);
 }
 
 
 void CallIC::Clear(Isolate* isolate, Code* host, CallICNexus* nexus) {
   // Determine our state.
   Object* feedback = nexus->vector()->Get(nexus->slot());
   State state = nexus->StateFromFeedback();
 
   if (state != UNINITIALIZED && !feedback->IsAllocationSite()) {
     nexus->ConfigureUninitialized();
     // The change in state must be processed.
     OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, UNINITIALIZED);
   }
 }
 
 
-void LoadIC::Clear(Isolate* isolate, Address address, Code* target,
-                   ConstantPoolArray* constant_pool) {
-  DCHECK(!FLAG_vector_ics);
-  if (IsCleared(target)) return;
-  Code* code = PropertyICCompiler::FindPreMonomorphic(isolate, Code::LOAD_IC,
-                                                      target->extra_ic_state());
-  SetTargetAtAddress(address, code, constant_pool);
-}
-
-
 void LoadIC::Clear(Isolate* isolate, Code* host, LoadICNexus* nexus) {
   if (IsCleared(nexus)) return;
   State state = nexus->StateFromFeedback();
   nexus->ConfigurePremonomorphic();
   OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, PREMONOMORPHIC);
 }
 
 
 void StoreIC::Clear(Isolate* isolate, Address address, Code* target,
                     ConstantPoolArray* constant_pool) {
@@ skipping 354 matching lines @@
     case DEFAULT:
     case GENERIC:
       UNREACHABLE();
       break;
   }
 }
 
 
 Handle<Code> LoadIC::initialize_stub(Isolate* isolate,
                                      ExtraICState extra_state) {
-  if (FLAG_vector_ics) {
-    return LoadICTrampolineStub(isolate, LoadICState(extra_state)).GetCode();
-  }
-
-  return PropertyICCompiler::ComputeLoad(isolate, UNINITIALIZED, extra_state);
-}
-
-
-Handle<Code> LoadIC::load_global(Isolate* isolate, Handle<GlobalObject> global,
-                                 Handle<String> name) {
-  // This special IC doesn't work with vector ics.
-  DCHECK(!FLAG_vector_ics);
-
-  Handle<ScriptContextTable> script_contexts(
-      global->native_context()->script_context_table());
-
-  ScriptContextTable::LookupResult lookup_result;
-  if (ScriptContextTable::Lookup(script_contexts, name, &lookup_result)) {
-    return initialize_stub(isolate, LoadICState(CONTEXTUAL).GetExtraICState());
-  }
-
-  Handle<Map> global_map(global->map());
-  Handle<Code> handler = PropertyHandlerCompiler::Find(
-      name, global_map, Code::LOAD_IC, kCacheOnReceiver, Code::NORMAL);
-  if (handler.is_null()) {
-    LookupIterator it(global, name);
-    if (!it.IsFound() || !it.GetHolder<JSObject>().is_identical_to(global) ||
-        it.state() != LookupIterator::DATA) {
-      return initialize_stub(isolate,
-                             LoadICState(CONTEXTUAL).GetExtraICState());
-    }
-    NamedLoadHandlerCompiler compiler(isolate, global_map, global,
-                                      kCacheOnReceiver);
-    Handle<PropertyCell> cell = it.GetPropertyCell();
-    handler = compiler.CompileLoadGlobal(cell, name, it.IsConfigurable());
-    Map::UpdateCodeCache(global_map, name, handler);
-  }
-  return PropertyICCompiler::ComputeMonomorphic(
-      Code::LOAD_IC, name, handle(global->map()), handler,
-      LoadICState(CONTEXTUAL).GetExtraICState());
+  return LoadICTrampolineStub(isolate, LoadICState(extra_state)).GetCode();
 }
 
 
 Handle<Code> LoadIC::initialize_stub_in_optimized_code(
     Isolate* isolate, ExtraICState extra_state, State initialization_state) {
-  if (FLAG_vector_ics) {
-    return VectorRawLoadStub(isolate, LoadICState(extra_state)).GetCode();
-  }
-  return PropertyICCompiler::ComputeLoad(isolate, initialization_state,
-                                         extra_state);
+  return VectorRawLoadStub(isolate, LoadICState(extra_state)).GetCode();
 }
 
 
 Handle<Code> KeyedLoadIC::initialize_stub(Isolate* isolate) {
-  if (FLAG_vector_ics) {
-    return KeyedLoadICTrampolineStub(isolate).GetCode();
-  }
-
-  return isolate->builtins()->KeyedLoadIC_Initialize();
+  return KeyedLoadICTrampolineStub(isolate).GetCode();
 }
 
 
 Handle<Code> KeyedLoadIC::initialize_stub_in_optimized_code(
     Isolate* isolate, State initialization_state) {
-  if (FLAG_vector_ics && initialization_state != MEGAMORPHIC) {
+  if (initialization_state != MEGAMORPHIC) {
     return VectorRawKeyedLoadStub(isolate).GetCode();
   }
   switch (initialization_state) {
     case UNINITIALIZED:
       return isolate->builtins()->KeyedLoadIC_Initialize();
-    case PREMONOMORPHIC:
-      return isolate->builtins()->KeyedLoadIC_PreMonomorphic();
     case MEGAMORPHIC:
       return isolate->builtins()->KeyedLoadIC_Megamorphic();
     default:
       UNREACHABLE();
   }
   return Handle<Code>();
 }
 
 
 Handle<Code> KeyedStoreIC::initialize_stub(Isolate* isolate,
@@ skipping 13 matching lines @@
                  ? isolate->builtins()->KeyedStoreIC_Megamorphic_Strict()
                  : isolate->builtins()->KeyedStoreIC_Megamorphic();
     default:
       UNREACHABLE();
   }
   return Handle<Code>();
 }
 
 
 Handle<Code> LoadIC::megamorphic_stub() {
-  if (kind() == Code::LOAD_IC) {
-    MegamorphicLoadStub stub(isolate(), LoadICState(extra_ic_state()));
-    return stub.GetCode();
-  } else {
-    DCHECK_EQ(Code::KEYED_LOAD_IC, kind());
-    return KeyedLoadIC::ChooseMegamorphicStub(isolate());
-  }
+  DCHECK_EQ(Code::KEYED_LOAD_IC, kind());
+  return KeyedLoadIC::ChooseMegamorphicStub(isolate());
 }
 
 
-Handle<Code> LoadIC::pre_monomorphic_stub(Isolate* isolate,
-                                          ExtraICState extra_state) {
-  DCHECK(!FLAG_vector_ics);
-  return PropertyICCompiler::ComputeLoad(isolate, PREMONOMORPHIC, extra_state);
-}
-
-
-Handle<Code> KeyedLoadIC::pre_monomorphic_stub(Isolate* isolate) {
-  return isolate->builtins()->KeyedLoadIC_PreMonomorphic();
-}
-
-
-Handle<Code> LoadIC::pre_monomorphic_stub() const {
-  if (kind() == Code::LOAD_IC) {
-    return LoadIC::pre_monomorphic_stub(isolate(), extra_ic_state());
-  } else {
-    DCHECK_EQ(Code::KEYED_LOAD_IC, kind());
-    return KeyedLoadIC::pre_monomorphic_stub(isolate());
-  }
-}
-
-
 Handle<Code> LoadIC::SimpleFieldLoad(FieldIndex index) {
   LoadFieldStub stub(isolate(), index);
   return stub.GetCode();
 }
 
 
 void LoadIC::UpdateCaches(LookupIterator* lookup) {
   if (state() == UNINITIALIZED) {
     // This is the first time we execute this inline cache. Set the target to
     // the pre monomorphic stub to delay setting the monomorphic state.
-    if (UseVector()) {
-      ConfigureVectorState(PREMONOMORPHIC);
-    } else {
-      set_target(*pre_monomorphic_stub());
-    }
+    ConfigureVectorState(PREMONOMORPHIC);
     TRACE_IC("LoadIC", lookup->name());
     return;
   }
 
   Handle<Code> code;
   if (lookup->state() == LookupIterator::JSPROXY ||
       lookup->state() == LookupIterator::ACCESS_CHECK) {
     code = slow_stub();
   } else if (!lookup->IsFound()) {
     if (kind() == Code::LOAD_IC) {
@@ skipping 247 matching lines @@
 
 
 Handle<Code> KeyedLoadIC::LoadElementStub(Handle<HeapObject> receiver) {
   Handle<Code> null_handle;
   Handle<Map> receiver_map(receiver->map(), isolate());
   MapHandleList target_receiver_maps;
   TargetMaps(&target_receiver_maps);
 
 
   if (target_receiver_maps.length() == 0) {
-    if (FLAG_vector_ics) {
-      Handle<Code> handler =
-          PropertyICCompiler::ComputeKeyedLoadMonomorphicHandler(receiver_map);
-      ConfigureVectorState(Handle<Name>::null(), receiver_map, handler);
-      return null_handle;
-    }
-    return PropertyICCompiler::ComputeKeyedLoadMonomorphic(receiver_map);
+    Handle<Code> handler =
+        PropertyICCompiler::ComputeKeyedLoadMonomorphicHandler(receiver_map);
+    ConfigureVectorState(Handle<Name>::null(), receiver_map, handler);
+    return null_handle;
   }
 
   // The first time a receiver is seen that is a transitioned version of the
   // previous monomorphic receiver type, assume the new ElementsKind is the
   // monomorphic type. This benefits global arrays that only transition
   // once, and all call sites accessing them are faster if they remain
   // monomorphic. If this optimistic assumption is not true, the IC will
   // miss again and it will become polymorphic and support both the
   // untransitioned and transitioned maps.
   if (state() == MONOMORPHIC && !receiver->IsString() &&
       IsMoreGeneralElementsKindTransition(
           target_receiver_maps.at(0)->elements_kind(),
           Handle<JSObject>::cast(receiver)->GetElementsKind())) {
-    if (FLAG_vector_ics) {
-      Handle<Code> handler =
-          PropertyICCompiler::ComputeKeyedLoadMonomorphicHandler(receiver_map);
-      ConfigureVectorState(Handle<Name>::null(), receiver_map, handler);
-      return null_handle;
-    }
-    return PropertyICCompiler::ComputeKeyedLoadMonomorphic(receiver_map);
+    Handle<Code> handler =
+        PropertyICCompiler::ComputeKeyedLoadMonomorphicHandler(receiver_map);
+    ConfigureVectorState(Handle<Name>::null(), receiver_map, handler);
+    return null_handle;
   }
 
   DCHECK(state() != GENERIC);
 
   // Determine the list of receiver maps that this call site has seen,
   // adding the map that was just encountered.
   if (!AddOneReceiverMapIfMissing(&target_receiver_maps, receiver_map)) {
     // If the miss wasn't due to an unseen map, a polymorphic stub
     // won't help, use the generic stub.
     TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "same map added twice");
     return megamorphic_stub();
   }
 
   // If the maximum number of receiver maps has been exceeded, use the generic
   // version of the IC.
   if (target_receiver_maps.length() > kMaxKeyedPolymorphism) {
     TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "max polymorph exceeded");
     return megamorphic_stub();
   }
 
-  if (FLAG_vector_ics) {
-    CodeHandleList handlers(target_receiver_maps.length());
-    ElementHandlerCompiler compiler(isolate());
-    compiler.CompileElementHandlers(&target_receiver_maps, &handlers);
-    ConfigureVectorState(Handle<Name>::null(), &target_receiver_maps,
-                         &handlers);
-    return null_handle;
-  }
-
-  return PropertyICCompiler::ComputeKeyedLoadPolymorphic(&target_receiver_maps);
+  CodeHandleList handlers(target_receiver_maps.length());
+  ElementHandlerCompiler compiler(isolate());
+  compiler.CompileElementHandlers(&target_receiver_maps, &handlers);
+  ConfigureVectorState(Handle<Name>::null(), &target_receiver_maps, &handlers);
+  return null_handle;
 }
 
 
 MaybeHandle<Object> KeyedLoadIC::Load(Handle<Object> object,
                                       Handle<Object> key) {
   if (MigrateDeprecated(object)) {
     Handle<Object> result;
     ASSIGN_RETURN_ON_EXCEPTION(
         isolate(), result, Runtime::GetObjectProperty(isolate(), object, key),
         Object);
@@ skipping 932 matching lines @@
 
 
 // Used from ic-<arch>.cc.
 RUNTIME_FUNCTION(LoadIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Name> key = args.at<Name>(1);
   Handle<Object> result;
 
-  if (FLAG_vector_ics) {
-    DCHECK(args.length() == 4);
-    Handle<Smi> slot = args.at<Smi>(2);
-    Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
-    FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
-    // A monomorphic or polymorphic KeyedLoadIC with a string key can call the
-    // LoadIC miss handler if the handler misses. Since the vector Nexus is
-    // set up outside the IC, handle that here.
-    if (vector->GetKind(vector_slot) == Code::LOAD_IC) {
-      LoadICNexus nexus(vector, vector_slot);
-      LoadIC ic(IC::NO_EXTRA_FRAME, isolate, &nexus);
-      ic.UpdateState(receiver, key);
-      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
-                                         ic.Load(receiver, key));
-    } else {
-      DCHECK(vector->GetKind(vector_slot) == Code::KEYED_LOAD_IC);
-      KeyedLoadICNexus nexus(vector, vector_slot);
-      KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate, &nexus);
-      ic.UpdateState(receiver, key);
-      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
-                                         ic.Load(receiver, key));
-    }
+  DCHECK(args.length() == 4);
+  Handle<Smi> slot = args.at<Smi>(2);
+  Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
+  FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
+  // A monomorphic or polymorphic KeyedLoadIC with a string key can call the
+  // LoadIC miss handler if the handler misses. Since the vector Nexus is
+  // set up outside the IC, handle that here.
+  if (vector->GetKind(vector_slot) == Code::LOAD_IC) {
+    LoadICNexus nexus(vector, vector_slot);
+    LoadIC ic(IC::NO_EXTRA_FRAME, isolate, &nexus);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
   } else {
-    DCHECK(args.length() == 2);
-    LoadIC ic(IC::NO_EXTRA_FRAME, isolate);
+    DCHECK(vector->GetKind(vector_slot) == Code::KEYED_LOAD_IC);
+    KeyedLoadICNexus nexus(vector, vector_slot);
+    KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate, &nexus);
     ic.UpdateState(receiver, key);
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
   }
   return *result;
 }
 
 
 // Used from ic-<arch>.cc
 RUNTIME_FUNCTION(KeyedLoadIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Object> key = args.at<Object>(1);
   Handle<Object> result;
 
-  if (FLAG_vector_ics) {
-    DCHECK(args.length() == 4);
-    Handle<Smi> slot = args.at<Smi>(2);
-    Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
-    FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
-    KeyedLoadICNexus nexus(vector, vector_slot);
-    KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate, &nexus);
-    ic.UpdateState(receiver, key);
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
-  } else {
-    DCHECK(args.length() == 2);
-    KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate);
-    ic.UpdateState(receiver, key);
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
-  }
-
+  DCHECK(args.length() == 4);
+  Handle<Smi> slot = args.at<Smi>(2);
+  Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
+  FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
+  KeyedLoadICNexus nexus(vector, vector_slot);
+  KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate, &nexus);
+  ic.UpdateState(receiver, key);
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
   return *result;
 }
 
 
 RUNTIME_FUNCTION(KeyedLoadIC_MissFromStubFailure) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Object> key = args.at<Object>(1);
   Handle<Object> result;
 
-  if (FLAG_vector_ics) {
-    DCHECK(args.length() == 4);
-    Handle<Smi> slot = args.at<Smi>(2);
-    Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
-    FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
-    KeyedLoadICNexus nexus(vector, vector_slot);
-    KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
-    ic.UpdateState(receiver, key);
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
-  } else {
-    DCHECK(args.length() == 2);
-    KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate);
-    ic.UpdateState(receiver, key);
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
-  }
+  DCHECK(args.length() == 4);
+  Handle<Smi> slot = args.at<Smi>(2);
+  Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
+  FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
+  KeyedLoadICNexus nexus(vector, vector_slot);
+  KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
+  ic.UpdateState(receiver, key);
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
 
   return *result;
 }
 
 
 // Used from ic-<arch>.cc.
 RUNTIME_FUNCTION(StoreIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
   DCHECK(args.length() == 3);
@@ skipping 544 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(LoadIC_MissFromStubFailure) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Name> key = args.at<Name>(1);
   Handle<Object> result;
 
-  if (FLAG_vector_ics) {
-    DCHECK(args.length() == 4);
-    Handle<Smi> slot = args.at<Smi>(2);
-    Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
-    FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
-    // A monomorphic or polymorphic KeyedLoadIC with a string key can call the
-    // LoadIC miss handler if the handler misses. Since the vector Nexus is
-    // set up outside the IC, handle that here.
-    if (vector->GetKind(vector_slot) == Code::LOAD_IC) {
-      LoadICNexus nexus(vector, vector_slot);
-      LoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
-      ic.UpdateState(receiver, key);
-      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
-                                         ic.Load(receiver, key));
-    } else {
-      DCHECK(vector->GetKind(vector_slot) == Code::KEYED_LOAD_IC);
-      KeyedLoadICNexus nexus(vector, vector_slot);
-      KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
-      ic.UpdateState(receiver, key);
-      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
-                                         ic.Load(receiver, key));
-    }
+  DCHECK(args.length() == 4);
+  Handle<Smi> slot = args.at<Smi>(2);
+  Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
+  FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
+  // A monomorphic or polymorphic KeyedLoadIC with a string key can call the
+  // LoadIC miss handler if the handler misses. Since the vector Nexus is
+  // set up outside the IC, handle that here.
+  if (vector->GetKind(vector_slot) == Code::LOAD_IC) {
+    LoadICNexus nexus(vector, vector_slot);
+    LoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
   } else {
-    DCHECK(args.length() == 2);
-    LoadIC ic(IC::EXTRA_CALL_FRAME, isolate);
+    DCHECK(vector->GetKind(vector_slot) == Code::KEYED_LOAD_IC);
+    KeyedLoadICNexus nexus(vector, vector_slot);
+    KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
     ic.UpdateState(receiver, key);
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
   }
 
   return *result;
 }
 
 
 static const Address IC_utilities[] = {
 #define ADDR(name) FUNCTION_ADDR(name),
     IC_UTIL_LIST(ADDR) NULL
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) { return IC_utilities[id]; }
 }
 }  // namespace v8::internal