Track whether a node or variable are likely to be a Smi value. Propagate that...

src/compiler.cc

 // Copyright 2006-2008 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 47 matching lines @@
   top->AllocateVariables();
 
 #ifdef DEBUG
   if (Bootstrapper::IsActive() ?
       FLAG_print_builtin_scopes :
       FLAG_print_scopes) {
     literal->scope()->Print();
   }
 #endif
 
+  // Optimize the AST.
+  Rewriter::Optimize(literal);
+
   // Generate code and return it.
   Handle<Code> result = CodeGenerator::MakeCode(literal, script, is_eval);
   return result;
 }
 
 
 static Handle<JSFunction> MakeFunction(bool is_global,
                                        bool is_eval,
                                        Handle<Script> script,
                                        v8::Extension* extension,
@@ skipping 207 matching lines @@
   // Set the expected number of properties for instances.
   SetExpectedNofPropertiesFromEstimate(shared, lit->expected_property_count());
 
   // Check the function has compiled code.
   ASSERT(shared->is_compiled());
   return true;
 }
 
 
 } }  // namespace v8::internal