In-object double fields unboxing (for 64-bit only).

test/cctest/test-heap.cc

 // Copyright 2012 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 2306 matching lines @@
 
   v8::Local<v8::Value> res = CompileRun(source.start());
 
   Handle<JSObject> o =
       v8::Utils::OpenHandle(*v8::Handle<v8::Object>::Cast(res));
 
   CHECK(CcTest::heap()->InOldPointerSpace(*o));
   FieldIndex idx1 = FieldIndex::ForPropertyIndex(o->map(), 0);
   FieldIndex idx2 = FieldIndex::ForPropertyIndex(o->map(), 1);
   CHECK(CcTest::heap()->InOldPointerSpace(o->RawFastPropertyAt(idx1)));
-  CHECK(CcTest::heap()->InOldDataSpace(o->RawFastPropertyAt(idx2)));
+  if (!FLAG_unbox_double_fields) {
+    CHECK(CcTest::heap()->InOldDataSpace(o->RawFastPropertyAt(idx2)));
+  }
 
   JSObject* inner_object =
       reinterpret_cast<JSObject*>(o->RawFastPropertyAt(idx1));
   CHECK(CcTest::heap()->InOldPointerSpace(inner_object));
-  CHECK(CcTest::heap()->InOldDataSpace(inner_object->RawFastPropertyAt(idx1)));
+  if (!FLAG_unbox_double_fields) {
+    CHECK(
+        CcTest::heap()->InOldDataSpace(inner_object->RawFastPropertyAt(idx1)));
+  }
   CHECK(CcTest::heap()->InOldPointerSpace(
       inner_object->RawFastPropertyAt(idx2)));
 }
 
 
 TEST(OptimizedPretenuringDoubleArrayProperties) {
   i::FLAG_allow_natives_syntax = true;
   i::FLAG_expose_gc = true;
   CcTest::InitializeVM();
   if (!CcTest::i_isolate()->use_crankshaft() || i::FLAG_always_opt) return;
@@ skipping 2066 matching lines @@
 #ifdef DEBUG
 TEST(PathTracer) {
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());
 
   v8::Local<v8::Value> result = CompileRun("'abc'");
   Handle<Object> o = v8::Utils::OpenHandle(*result);
   CcTest::i_isolate()->heap()->TracePathToObject(*o);
 }
 #endif  // DEBUG