TREE_PCMP
return (TREE_PCMP(d1, d2));
return ((cmp || r1->ref_search) ? cmp : TREE_PCMP(r1, r2));
return (TREE_PCMP(sr1, sr2));
return (TREE_PCMP(z1, z2));
return (TREE_PCMP(z1, z2));