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fix #2553

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-09-13 15:01:17 +02:00
parent 67c4777514
commit 098725aa1c
1 changed files with 7 additions and 2 deletions
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9
src/smt/theory_seq.cpp
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@ -2979,10 +2979,15 @@ bool theory_seq::reduce_length(unsigned i, unsigned j, bool front, expr_ref_vect
expr_ref_vector lhs(m), rhs(m); expr_ref_vector lhs(m), rhs(m);
lhs.append(l2, ls2); lhs.append(l2, ls2);
rhs.append(r2, rs2); rhs.append(r2, rs2);
deps = mk_join(deps, lit); for (auto const& e : m_eqs) {
if (e.ls() == lhs && e.rs() == rhs) {
return false;
}
}
deps = mk_join(deps, lit);
m_eqs.push_back(eq(m_eq_id++, lhs, rhs, deps)); m_eqs.push_back(eq(m_eq_id++, lhs, rhs, deps));
propagate_eq(deps, l, r, true); propagate_eq(deps, l, r, true);
TRACE("seq", tout << "propagate eq\nlhs: " << lhs << "\nrhs: " << rhs << "\n";); TRACE("seq", tout << "propagate eq\n" << m_eqs.size() << "\nlhs: " << lhs << "\nrhs: " << rhs << "\n";);
return true; return true;
} }
else { else {