HLoadNamedField for Smis optimized for x64

src/hydrogen-instructions.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 6198 matching lines @@
     SetOperandAt(0, object);
 
     Representation representation = access.representation();
     if (representation.IsInteger8() ||
         representation.IsUInteger8() ||
         representation.IsInteger16() ||
         representation.IsUInteger16()) {
       set_representation(Representation::Integer32());
     } else if (representation.IsSmi()) {
       set_type(HType::Smi());
-      set_representation(representation);
+      if (SmiValuesAre32Bits()) {
+        set_representation(Representation::Integer32());
+      } else {
+        set_representation(representation);
+      }
     } else if (representation.IsDouble() ||
                representation.IsExternal() ||
                representation.IsInteger32()) {
       set_representation(representation);
     } else if (FLAG_track_heap_object_fields &&
                representation.IsHeapObject()) {
       set_type(HType::NonPrimitive());
       set_representation(Representation::Tagged());
     } else {
       set_representation(Representation::Tagged());
@@ skipping 1259 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_