Hi, I've met this code in V8:
void FullCodeGenerator::EmitCreateIterResultObject(CallRuntime* expr) {
ZoneList<Expression*>* args = expr->arguments();
DCHECK_EQ(2, args->length());
VisitForStackValue(args->at(0));
VisitForStackValue(args->at(1));
Label runtime, done;
__ Allocate(JSIteratorResult::kSize, rax, rcx, rdx, &runtime, TAG_OBJECT);
__ LoadNativeContextSlot(Context::ITERATOR_RESULT_MAP_INDEX, rbx);
__ movp(FieldOperand(rax, HeapObject::kMapOffset), rbx);
__ LoadRoot(rbx, Heap::kEmptyFixedArrayRootIndex);
__ movp(FieldOperand(rax, JSObject::kPropertiesOffset), rbx);
__ movp(FieldOperand(rax, JSObject::kElementsOffset), rbx);
The last two mov's instruction looks strange. What have you wanted to reach?
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