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fix #2416 exposed bugs: unsat-core extraction in combination with chronological backracking, equivalence elimination in combination with PB constraints

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-07-25 18:55:44 -07:00
parent 8a0d79251e
commit 53aded3198
4 changed files with 14 additions and 19 deletions
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src/sat/sat_elim_eqs.cpp
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@ -230,7 +230,8 @@ namespace sat {
literal l(v, false);
literal r = roots[v];
SASSERT(v != r.var());
bool root_ok = !m_solver.is_external(v) || m_solver.set_root(l, r);
bool set_root = m_solver.set_root(l, r);
bool root_ok = !m_solver.is_external(v) || set_root;
if (m_solver.is_assumption(v) || (m_solver.is_external(v) && (m_solver.is_incremental() || !root_ok))) {
// cannot really eliminate v, since we have to notify extension of future assignments
m_solver.mk_bin_clause(~l, r, false);