Skip the write barrier for global property cell writes. The heap...

src/ia32/stub-cache-ia32.cc

 // Copyright 2006-2009 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 957 matching lines @@
   // Check that the map of the global has not changed.
   __ mov(ebx, (Operand(esp, kPointerSize)));
   __ cmp(FieldOperand(ebx, HeapObject::kMapOffset),
          Immediate(Handle<Map>(object->map())));
   __ j(not_equal, &miss, not_taken);
 
   // Store the value in the cell.
   __ mov(ecx, Immediate(Handle<JSGlobalPropertyCell>(cell)));
   __ mov(FieldOperand(ecx, JSGlobalPropertyCell::kValueOffset), eax);
 
-  // RecordWrite clobbers the value register. Pass the value being stored in
-  // edx.
-  __ mov(edx, eax);
-  __ RecordWrite(ecx, JSGlobalPropertyCell::kValueOffset, edx, ebx);
-
   // Return the value (register eax).
   __ ret(0);
 
   // Handle store cache miss.
   __ bind(&miss);
   __ DecrementCounter(&Counters::named_store_global_inline, 1);
   __ IncrementCounter(&Counters::named_store_global_inline_miss, 1);
   Handle<Code> ic(Builtins::builtin(Builtins::StoreIC_Miss));
   __ jmp(ic, RelocInfo::CODE_TARGET);
 
@@ skipping 393 matching lines @@
   GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC);
 
   // Return the generated code.
   return GetCode(CALLBACKS, name);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal