- Fix the x64 store-barrier.

runtime/vm/stub_code_x64.cc

 // Copyright (c) 2012, 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_X64)
 
 #include "vm/assembler.h"
 #include "vm/assembler_macros.h"
 #include "vm/code_generator.h"
@@ skipping 1067 matching lines @@
   // RAX: Address being stored
   __ movq(CTX, FieldAddress(CTX, Context::isolate_offset()));
 
   // Load top_ out of the StoreBufferBlock and add the address to the pointers_.
   // RAX: Address being stored
   // CTX: Isolate
   intptr_t store_buffer_offset = Isolate::store_buffer_offset();
   __ movl(RBX,
           Address(CTX, store_buffer_offset + StoreBufferBlock::top_offset()));
   __ movq(Address(CTX,
-                  RBX, TIMES_4,
+                  RBX, TIMES_8,
                   store_buffer_offset + StoreBufferBlock::pointers_offset()),
           RAX);
 
   // Increment top_ and check for overflow.
   // RBX: top_
   // CTX: Isolate
   Label L;
   __ incq(RBX);
   __ movl(Address(CTX, store_buffer_offset + StoreBufferBlock::top_offset()),
           RBX);
@@ skipping 770 matching lines @@
 // TOS + 2: instance.
 // TOS + 3: cache array.
 // Result in RCX: null -> not found, otherwise result (true or false).
 void StubCode::GenerateSubtype3TestCacheStub(Assembler* assembler) {
   GenerateSubtypeNTestCacheStub(assembler, 3);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64