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fix(tseitin): use final check to push axioms

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This commit is contained in:
Simon Cruanes 2019-02-09 23:35:49 -06:00
parent bf0171fec1
commit b5208da56c
3 changed files with 36 additions and 23 deletions
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2
src/cc/Congruence_closure.ml
View file

@ -842,9 +842,9 @@ module Make(A: ARG) = struct
let sign = A.Lit.sign lit in
begin match T.cc_view t with
| Eq (a,b) when sign ->
(* merge [a] and [b] *)
let a = add_term cc a in
let b = add_term cc b in
(* merge [a] and [b] *)
push_combine cc a b (Expl.mk_lit lit)
| _ ->
(* equate t and true/false *)

4
src/smt/Theory_combine.ml
View file

@ -42,8 +42,8 @@ let[@inline] theories (self:t) : theory_state Sequence.t =
(* handle a literal assumed by the SAT solver *)
let assert_lits_ ~final (self:t) acts (lits:Lit.t Sequence.t) : unit =
Msat.Log.debugf 2
(fun k->k "(@[<hv1>@{<green>th_combine.assume_lits@}@ %a@])"
(Util.pp_seq ~sep:";" Lit.pp) lits);
(fun k->k "(@[<hv1>@{<green>th_combine.assume_lits@}%s@ %a@])"
(if final then "[final]" else "") (Util.pp_seq ~sep:"; " Lit.pp) lits);
(* transmit to CC *)
Vec.clear self.new_merges;
let cc = cc self in

53
src/th-bool/Sidekick_th_bool.ml
View file

@ -162,7 +162,9 @@ type t = {
tst: Term.state;
}
let tseitin (_self:t) (acts:Theory.actions) (lit:Lit.t) (lit_t:term) (v:term view) : unit =
let pp_c out c = Fmt.fprintf out "(@[<hv>%a@])" (Util.pp_list Lit.pp) c
let tseitin ~final (self:t) (acts:Theory.actions) (lit:Lit.t) (lit_t:term) (v:term view) : unit =
let (module A) = acts in
Log.debugf 5 (fun k->k "(@[th_bool.tseitin@ %a@])" Lit.pp lit);
match v with
@ -172,9 +174,16 @@ let tseitin (_self:t) (acts:Theory.actions) (lit:Lit.t) (lit_t:term) (v:term vie
let l = IArray.to_list l in
if Lit.sign lit then (
A.propagate_distinct l ~neq:lit_t lit
) else (
(* TODO: propagate pairwise equalities? *)
Error.errorf "cannot process negative distinct lit %a" Lit.pp lit;
) else if final then (
(* add clause [distinct t1…tn ∨ ∨_{i,j>i} t_i=j] *)
let c =
Sequence.diagonal_l l
|> Sequence.map (fun (t,u) -> Lit.eq self.tst t u)
|> Sequence.to_rev_list
in
let c = Lit.neg lit :: c in
Log.debugf 5 (fun k->k "(@[tseitin.distinct.case-split@ %a@])" pp_c c);
A.add_local_axiom c
)
| B_and subs ->
if Lit.sign lit then (
@ -182,35 +191,35 @@ let tseitin (_self:t) (acts:Theory.actions) (lit:Lit.t) (lit_t:term) (v:term vie
IArray.iter
(fun sub ->
let sublit = Lit.atom sub in
A.add_local_axiom [Lit.neg lit; sublit])
A.propagate sublit [lit])
subs
) else (
(* propagate [¬lit => ∨_i ¬ subs_i] *)
) else if final then (
(* axiom [¬lit => ∨_i ¬ subs_i] *)
let subs = IArray.to_list subs in
let c = Lit.neg lit :: List.map (Lit.atom ~sign:false) subs in
A.add_local_axiom c
)
| B_or subs ->
if Lit.sign lit then (
(* propagate [lit => ∨_i subs_i] *)
let subs = IArray.to_list subs in
let c = Lit.neg lit :: List.map (Lit.atom ~sign:true) subs in
A.add_local_axiom c
) else (
if not @@ Lit.sign lit then (
(* propagate [¬lit => ¬subs_i] *)
IArray.iter
(fun sub ->
let sublit = Lit.atom ~sign:false sub in
A.add_local_axiom [Lit.neg lit; sublit])
subs
) else if final then (
(* axiom [lit => ∨_i subs_i] *)
let subs = IArray.to_list subs in
let c = Lit.neg lit :: List.map (Lit.atom ~sign:true) subs in
A.add_local_axiom c
)
| B_imply (guard,concl) ->
if Lit.sign lit then (
(* propagate [lit => ∨_i ¬guard_i ∨ concl] *)
if Lit.sign lit && final then (
(* axiom [lit => ∨_i ¬guard_i ∨ concl] *)
let guard = IArray.to_list guard in
let c = Lit.atom concl :: Lit.neg lit :: List.map (Lit.atom ~sign:false) guard in
A.add_local_axiom c
) else (
) else if not @@ Lit.sign lit then (
(* propagate [¬lit => ¬concl] *)
A.propagate (Lit.atom ~sign:false concl) [lit];
(* propagate [¬lit => ∧_i guard_i] *)
@ -221,15 +230,19 @@ let tseitin (_self:t) (acts:Theory.actions) (lit:Lit.t) (lit_t:term) (v:term vie
guard
)
let partial_check (self:t) acts (lits:Lit.t Sequence.t) =
let check_ ~final self acts lits =
lits
(fun lit ->
let t = Lit.term lit in
match view t with
| B_atom _ -> ()
| v -> tseitin self acts lit t v)
| B_atom _ | B_eq _ -> ()
| v -> tseitin ~final self acts lit t v)
let final_check _ _ _ : unit = ()
let partial_check (self:t) acts (lits:Lit.t Sequence.t) =
check_ ~final:false self acts lits
let final_check (self:t) acts (lits:Lit.t Sequence.t) =
check_ ~final:true self acts lits
let th =
Theory.make