// split the store check operation so that other instructions can be scheduled inbetween

void MacroAssembler::store_check_part_1(Register obj) {

  {- -------------------------------------------
  (1) 書き込んだアドレスに対応する card table の index を求める.
      (書き込んだアドレスを CardTableModRefBS::card_shift 分だけ右シフトする)
      ---------------------------------------- -}

      BarrierSet* bs = Universe::heap()->barrier_set();
      assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind");
      shrptr(obj, CardTableModRefBS::card_shift);
    }