RQSW_BPW
for (j = 0; j < RQSW_BPW; j++)
#define RQSW_NB (howmany(RQ_NQS, RQSW_BPW))
#define RQSW_IDX(idx) ((idx) / RQSW_BPW)
#define RQSW_BIT_IDX(idx) ((idx) % RQSW_BPW)
(((word_idx) * RQSW_BPW) + (bit_idx))