- Fix the barrier code when low bits of Smi are zeroes.

runtime/vm/assembler_ia32.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/heap.h"
 #include "vm/memory_region.h"
@@ skipping 1375 matching lines @@
 
 void Assembler::StoreIntoObject(Register object,
                                 const FieldAddress& dest,
                                 Register value) {
   movl(dest, value);
   Label done;
   // Check that 'value' is a new object.  Store buffer updates are not
   // required when storing a smi or an old object.
   testl(value, Immediate(kNewObjectAlignmentOffset | kHeapObjectTag));
   j(PARITY_ODD, &done, Assembler::kNearJump);
+  j(ZERO, &done, Assembler::kNearJump);
   // Check that 'object' is an old object.  A store buffer update is
   // not required when storing into a new object.
   testl(object, Immediate(kNewObjectAlignmentOffset));
   j(NOT_ZERO, &done, Assembler::kNearJump);
   // A store buffer update is required.
   pushl(EAX);  // Preserve EAX.
   leal(EAX, dest);
   call(&StubCode::UpdateStoreBufferLabel());
   popl(EAX);  // Restore EAX.
   Bind(&done);
@@ skipping 319 matching lines @@
     comments.SetCommentAt(i, comments_[i]->comment());
   }
 
   return comments;
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32