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Simon Cruanes 2021-11-28 11:28:55 -05:00
parent 2e4fd5e1c1
commit 0233801b95
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GPG key ID: 4AC01D0849AA62B6
1 changed files with 20 additions and 6 deletions
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20
src/sat/Solver.ml
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@ -888,8 +888,9 @@ module Make(Plugin : PLUGIN)
if i >= Array.length arr then []
else Array.to_list (Array.sub arr i (Array.length arr - i))
(* get/build the proof for [a], which must be an atom true at level0.
This uses a cache *)
(* get/build the proof for [a], which must be an atom true at level 0.
This uses a global cache to avoid repeated computations, as many clauses
might resolve against a given 0-level atom. *)
let rec proof_of_atom_lvl0_ (self:t) (a:atom) : proof_step =
assert (Atom.is_true self.store a && Atom.level self.store a = 0);
@ -902,19 +903,32 @@ module Make(Plugin : PLUGIN)
| None -> assert false
| Some Decision -> assert false (* no decisions at level0 *)
| Some (Bcp c2 | Bcp_lazy (lazy c2)) ->
Log.debugf 50
(fun k->k"(@[sat.proof-of-atom-lvl0.clause@ %a@])"
(Clause.debug self.store) c2);
let steps = ref [] in
(* recurse, so we get the whole level-0 resolution graph *)
Clause.iter self.store c2
~f:(fun a2 ->
if not (Var.equal (Atom.var a) (Atom.var a2)) then (
Log.debugf 50
(fun k->k"(@[sat.proof-of-atom-lvl0@ :of %a@ \
@[:resolve-with@ %a@]@])"
(Atom.debug self.store) a (Atom.debug self.store) a2);
let p2 = proof_of_atom_lvl0_ self (Atom.neg a2) in
steps := p2 :: !steps;
));
let proof_c2 = Clause.proof_step self.store c2 in
if !steps = [] then proof_c2
else (
Proof.emit_redundant_clause
(Iter.return (Atom.lit self.store a))
~hyps:Iter.(cons (Clause.proof_step self.store c2) (of_list !steps))
~hyps:Iter.(cons proof_c2 (of_list !steps))
self.proof
)
in
Atom.set_proof_lvl0 self.store a p; (* put in cache *)