121   while (offset >= N_words) {

   121   while (offset >= N_words) {

   122     // The excess of the offset from N_words indicates a power of Base

   122     // The excess of the offset from N_words indicates a power of Base

   123     // to go back by.

   123     // to go back by.

   124     size_t n_cards_back = BlockOffsetArray::entry_to_cards_back(offset);

   124     size_t n_cards_back = BlockOffsetArray::entry_to_cards_back(offset);

   125     q -= (N_words * n_cards_back);

   125     q -= (N_words * n_cards_back);

   127     index -= n_cards_back;

   126     index -= n_cards_back;

   128     offset = _array->offset_array(index);

   127     offset = _array->offset_array(index);

   129   }

   128   }

   130   assert(offset < N_words, "offset too large");

   129   assert(offset < N_words, "offset too large");

   131   q -= offset;

   130   q -= offset;