I8_BITS
struct sw842_hlist_node8 node8[1 << I8_BITS];
ret = add_bits(p, p->index8[0], I8_BITS);
u64 n8 = (pos >> 3) % (1 << I8_BITS);
#define I8_FIFO_SIZE (8 * (1 << I8_BITS))
return __do_index(p, 8, I8_BITS, I8_FIFO_SIZE);