PCTRIE_WIDTH
node->pn_clev / PCTRIE_WIDTH);
node->pn_clev / PCTRIE_WIDTH);
child->pn_clev = rounddown(ilog2(index ^ newind), PCTRIE_WIDTH);
#if PCTRIE_WIDTH == 3
#elif PCTRIE_WIDTH == 4
#elif PCTRIE_WIDTH == 5
#define PCTRIE_COUNT (1 << PCTRIE_WIDTH)