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Add forbidden interval lemma separately

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This commit is contained in:
Jakob Rath 2022-11-17 14:59:06 +01:00
parent b4ee8cef1a
commit dbe814d568
6 changed files with 41 additions and 24 deletions
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20
src/math/polysat/viable.cpp
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@ -643,6 +643,7 @@ namespace polysat {
// If there is a full interval, all others would have been removed
SASSERT(!e->interval.is_full() || e->next() == e);
SASSERT(e->interval.is_full() || all_of(*e, [](entry const& f) { return !f.interval.is_full(); }));
clause_builder lemma(s);
do {
// Build constraint: upper bound of each interval is not contained in the next interval,
// using the equivalence: t \in [l;h[ <=> t-l < h-l
@ -694,26 +695,19 @@ namespace polysat {
auto lhs = hi - next_lo;
auto rhs = next_hi - next_lo;
signed_constraint c = s.m_constraints.ult(lhs, rhs);
core.insert_eval(c);
lemma.insert_eval(~c);
}
for (auto sc : e->side_cond)
core.insert_eval(sc);
lemma.insert_eval(~sc);
lemma.insert(~e->src);
core.insert(e->src);
e = n;
}
while (e != first);
SASSERT(all_of(lemma, [this](sat::literal lit) { return s.m_bvars.value(lit) == l_false; }));
core.add_lemma(lemma.build());
core.logger().log(inf_fi(*this, v));
// TODO: should not be here, too general
for (auto c : core) {
if (c.bvalue(s) == l_false) {
UNREACHABLE(); // an invariant of the new conflict state is that bvalue of all inserted constraints is l_true (cf. assertion in conflict::insert)
core.set(~c);
core.logger().log("");
break;
}
}
return true;
}