let compute_unit_clause_weight = compute_unit_clause_weight;;
let compute_goal_weight = compute_goal_weight;;
+ (*CSC: beware! Imperative cache! *)
+ let cache = Hashtbl.create 101
+
let rec lpo_le s t =
eq_foterm s t || lpo_lt s t
and lpo_lt s t =
+ try Hashtbl.find cache (s,t)
+ with
+ Not_found -> let res =
match s,t with
| _, Terms.Var _ -> false
| Terms.Var i,_ ->
compare_args tl1 tl2
| _ -> assert false
end
+ in
+ Hashtbl.add cache (s,t) res; res
;;
let lpo s t =
+ let res =
if eq_foterm s t then XEQ
else if lpo_lt s t then XLT
else if lpo_lt t s then XGT
else XINCOMPARABLE
+ in
+ Hashtbl.clear cache; res
;;