Active smi-only optimizations for large array literals.

src/objects.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 7749 matching lines @@
     MaybeObject* maybe = heap->AllocateFixedArrayWithHoles(capacity);
     if (!maybe->ToObject(&object)) return maybe;
     new_elements = FixedArray::cast(object);
   }
 
   // Find the new map to use for this object if there is a map change.
   Map* new_map = NULL;
   if (elements()->map() != heap->non_strict_arguments_elements_map()) {
     Object* object;
     bool has_fast_smi_only_elements =
-        FLAG_smi_only_arrays &&
         (set_capacity_mode == kAllowSmiOnlyElements) &&
         (elements()->map()->has_fast_smi_only_elements() ||
          elements() == heap->empty_fixed_array());
     ElementsKind elements_kind = has_fast_smi_only_elements
         ? FAST_SMI_ONLY_ELEMENTS
         : FAST_ELEMENTS;
     MaybeObject* maybe = GetElementsTransitionMap(elements_kind);
     if (!maybe->ToObject(&object)) return maybe;
     new_map = Map::cast(object);
   }
@@ skipping 4399 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single break point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal