BN_num_bits_word
i = BN_num_bits_word(d);
int rshift = BN_num_bits_word(d[top - 1]), lshift, i;
ubits = utop * BN_BITS2 + BN_num_bits_word(ul);
ret += BN_num_bits_word(a->d[j]) & mask;
return ((i * BN_BITS2) + BN_num_bits_word(a->d[i]));
j = BN_num_bits_word((BN_ULONG)al);
j = BN_num_bits_word((BN_ULONG)bl);
j = BN_num_bits_word((BN_ULONG)al);
j = BN_BITS2 - BN_num_bits_word(w);
int BN_num_bits_word(BN_ULONG l);