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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-04-14 08:35:48 -07:00
parent 0c4e4ad702
commit 725b13680e
6 changed files with 80 additions and 104 deletions
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24
src/smt/seq/seq_nielsen.cpp
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@ -1275,8 +1275,7 @@ namespace seq {
: "UNKNOWN")
<< "\n";);
if (r == search_result::sat) {
IF_VERBOSE(
1,
IF_VERBOSE(1,
verbose_stream() << "side constraints: \n";
for (auto const &c : cur_path.back()->side_constraints()) {
verbose_stream() << " side constraint: " << c.fml << "\n";
@ -1289,6 +1288,7 @@ namespace seq {
++m_stats.m_num_unsat;
auto deps = collect_conflict_deps();
m_dep_mgr.linearize(deps, m_conflict_sources);
TRACE(seq, display(tout, m_root));
return r;
}
// depth limit hit – double the bound and retry
@ -1420,7 +1420,7 @@ namespace seq {
// for each variable with multiple regex constraints, verify
// that the intersection of all its regexes is non-empty.
// Mirrors ZIPT NielsenNode.CheckRegex.
dep_tracker dep;
dep_tracker dep = nullptr;
if (!check_leaf_regex(*node, dep)) {
node->set_general_conflict();
node->set_conflict(backtrack_reason::regex, dep);
@ -3655,18 +3655,14 @@ namespace seq {
SASSERT(n->m_conflict_external_literal == sat::null_literal);
continue;
}
SASSERT(n->is_currently_conflict());
if (n->m_conflict_external_literal != sat::null_literal) {
// We know from the outer solver that this literal is assigned false
deps = m_dep_mgr.mk_join(deps, m_dep_mgr.mk_leaf(n->m_conflict_external_literal));
if (n->m_conflict_internal)
deps = m_dep_mgr.mk_join(deps, n->m_conflict_internal);
continue;
}
SASSERT(n->outgoing().empty());
SASSERT(n->m_conflict_internal);
deps = m_dep_mgr.mk_join(deps, n->m_conflict_internal);
SASSERT(n->is_currently_conflict());
if (n->m_conflict_external_literal != sat::null_literal)
// We know from the outer solver that this literal is assigned true and contradicts node constraint
deps = m_dep_mgr.mk_join(deps, m_dep_mgr.mk_leaf(n->m_conflict_external_literal));
if (n->m_conflict_internal)
deps = m_dep_mgr.mk_join(deps, n->m_conflict_internal);
}
return deps;
}