Share Maps for ElementsKind transitions

src/hydrogen.cc

 // Copyright 2011 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 3933 matching lines @@
 }
 
 
 HInstruction* HGraphBuilder::BuildMonomorphicElementAccess(HValue* object,
                                                            HValue* key,
                                                            HValue* val,
                                                            Expression* expr,
                                                            bool is_store) {
   ASSERT(expr->IsMonomorphic());
   Handle<Map> map = expr->GetMonomorphicReceiverType();
+  AddInstruction(new(zone()) HCheckNonSmi(object));
+  HInstruction* mapcheck = AddInstruction(new(zone()) HCheckMap(object, map));
   if (!map->has_fast_elements() &&
       !map->has_fast_double_elements() &&
       !map->has_external_array_elements()) {
     return is_store ? BuildStoreKeyedGeneric(object, key, val)
                     : BuildLoadKeyedGeneric(object, key);
   }
-  AddInstruction(new(zone()) HCheckNonSmi(object));
-  HInstruction* mapcheck = AddInstruction(new(zone()) HCheckMap(object, map));
   HInstruction* elements = AddInstruction(new(zone()) HLoadElements(object));
   bool fast_double_elements = map->has_fast_double_elements();
   if (is_store && map->has_fast_elements()) {
     AddInstruction(new(zone()) HCheckMap(
         elements, isolate()->factory()->fixed_array_map()));
   }
   HInstruction* length = NULL;
   HInstruction* checked_key = NULL;
   if (map->has_external_array_elements()) {
     length = AddInstruction(new(zone()) HFixedArrayBaseLength(elements));
@@ skipping 2849 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify();
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal