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allow propagation of lits under base_level

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This commit is contained in:
Simon Cruanes 2016-07-27 18:16:26 +02:00
parent 3e9c0d3a1e
commit 73c2500b05
1 changed files with 12 additions and 5 deletions
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17
src/core/internal.ml
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@ -414,11 +414,17 @@ module Make
for c = env.elt_head to Vec.size env.elt_queue - 1 do
match (Vec.get env.elt_queue c) with
(* A literal is unassigned, we nedd to add it back to
the heap of potentially assignable literals. *)
the heap of potentially assignable literals, unless it has
a level lower than [lvl], in which case we just move it back. *)
| Lit l ->
l.assigned <- None;
l.l_level <- -1;
insert_var_order (elt_of_lit l)
if l.l_level <= lvl then begin
Vec.set env.elt_queue env.elt_head (of_lit l);
env.elt_head <- env.elt_head + 1
end else begin
l.assigned <- None;
l.l_level <- -1;
insert_var_order (elt_of_lit l)
end
(* A variable is not true/false anymore, one of two things can happen: *)
| Atom a ->
if a.var.v_level <= lvl then begin
@ -543,8 +549,9 @@ module Make
| [] -> env.base_level
| [a] ->
assert is_uip;
env.base_level
0
| a :: b :: r ->
assert(a.var.v_level > env.base_level);
if is_uip then (
(* backtrack below [a], so we can propagate [not a] *)
assert(a.var.v_level > b.var.v_level);