Improve constant element index access code generation

src/hydrogen.cc

 // 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 5846 matching lines @@
   }
   ASSERT(fast_smi_only_elements ||
          fast_elements ||
          map->has_fast_double_elements());
   if (map->instance_type() == JS_ARRAY_TYPE) {
     length = AddInstruction(new(zone()) HJSArrayLength(object, mapcheck,
                                                        HType::Smi()));
   } else {
     length = AddInstruction(new(zone()) HFixedArrayBaseLength(elements));
   }
-  checked_key = AddInstruction(new(zone()) HBoundsCheck(key, length));
+  checked_key = AddInstruction(new(zone()) HBoundsCheck(key, length,
+                                                        ALLOW_SMI_KEY));
   return BuildFastElementAccess(elements, checked_key, val, mapcheck,
                                 map->elements_kind(), is_store);
 }
 
 
 HInstruction* HGraphBuilder::TryBuildConsolidatedElementLoad(
     HValue* object,
     HValue* key,
     HValue* val,
     SmallMapList* maps) {
@@ skipping 3705 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal