Improve the allocation and initialization of locals on IA32 in the top-level ...

src/ia32/fast-codegen-ia32.cc

 // Copyright 2009 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 44 matching lines @@
   function_ = fun;
   SetFunctionPosition(fun);
 
   __ push(ebp);  // Caller's frame pointer.
   __ mov(ebp, esp);
   __ push(esi);  // Callee's context.
   __ push(edi);  // Callee's JS Function.
 
   { Comment cmnt(masm_, "[ Allocate locals");
     int locals_count = fun->scope()->num_stack_slots();
-    for (int i = 0; i < locals_count; i++) {
+    if (locals_count == 1) {
       __ push(Immediate(Factory::undefined_value()));
+    } else if (locals_count > 1) {
+      __ mov(eax, Immediate(Factory::undefined_value()));
+      for (int i = 0; i < locals_count; i++) {
+       __ push(eax);
+      }
     }
   }
 
   bool function_in_register = true;
 
   Variable* arguments = fun->scope()->arguments()->AsVariable();
   if (arguments != NULL) {
     // Function uses arguments object.
     Comment cmnt(masm_, "[ Allocate arguments object");
     __ push(edi);
@@ skipping 1463 matching lines @@
   true_label_ = saved_true;
   false_label_ = saved_false;
   // Convert current context to test context: End post-test code.
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal