Elide hole checks on KeyedLoads of holey double arrays.

src/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 371 matching lines @@
   }
 
   void MarkRecursive() {
     is_recursive_ = true;
   }
 
   bool is_recursive() const {
     return is_recursive_;
   }
 
+  void MarkDependsOnEmptyArrayProtoElements() {
+    depends_on_empty_array_proto_elements_ = true;
+  }
+
+  bool depends_on_empty_array_proto_elements() {
+    return depends_on_empty_array_proto_elements_;
+  }
+
   void RecordUint32Instruction(HInstruction* instr) {
     if (uint32_instructions_ == NULL) {
       uint32_instructions_ = new(zone()) ZoneList<HInstruction*>(4, zone());
     }
     uint32_instructions_->Add(instr, zone());
   }
 
  private:
   HConstant* GetConstantInt32(SetOncePointer<HConstant>* pointer,
                               int32_t integer_value);
@@ skipping 40 matching lines @@
 
   SetOncePointer<HBasicBlock> osr_loop_entry_;
   SetOncePointer<ZoneList<HUnknownOSRValue*> > osr_values_;
 
   CompilationInfo* info_;
   Zone* zone_;
 
   bool is_recursive_;
   bool use_optimistic_licm_;
   bool has_soft_deoptimize_;
+  bool depends_on_empty_array_proto_elements_;
   int type_change_checksum_;
 
   DISALLOW_COPY_AND_ASSIGN(HGraph);
 };
 
 
 Zone* HBasicBlock::zone() const { return graph_->zone(); }
 
 
 // Type of stack frame an environment might refer to.
@@ skipping 533 matching lines @@
       ElementsKind elements_kind,
       bool is_store);
 
   HInstruction* BuildFastElementAccess(
       HValue* elements,
       HValue* checked_key,
       HValue* val,
       HValue* dependency,
       ElementsKind elements_kind,
       bool is_store,
+      LoadKeyedHoleMode load_mode,
       KeyedAccessStoreMode store_mode);
 
   HValue* BuildCheckForCapacityGrow(HValue* object,
                                     HValue* elements,
                                     ElementsKind kind,
                                     HValue* length,
                                     HValue* key,
                                     bool is_js_array);
 
   HValue* BuildCopyElementsOnWrite(HValue* object,
                                    HValue* elements,
                                    ElementsKind kind,
                                    HValue* length);
 
   HInstruction* BuildUncheckedMonomorphicElementAccess(
       HValue* object,
       HValue* key,
       HValue* val,
       HCheckMaps* mapcheck,
       bool is_js_array,
       ElementsKind elements_kind,
       bool is_store,
+      LoadKeyedHoleMode load_mode,
       KeyedAccessStoreMode store_mode,
       Representation checked_index_representation = Representation::None());
 
   HInstruction* BuildStoreMap(HValue* object, HValue* map);
   HInstruction* BuildStoreMap(HValue* object, Handle<Map> map);
 
   HLoadNamedField* AddLoadElements(HValue *object, HValue *typecheck = NULL);
 
   class IfBuilder {
    public:
@@ skipping 976 matching lines @@
   EmbeddedVector<char, 64> filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_