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avoid adding constantly false statements to the lemma

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Signed-off-by: Lev <levnach@hotmail.com>
This commit is contained in:
Lev 2018-12-12 14:57:04 -10:00 • committed by Lev Nachmanson
parent dbfa3fc84a
commit 489da283bb
3 changed files with 4 additions and 2 deletions
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2
src/util/lp/lar_term.h
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@ -47,7 +47,7 @@ public:
}
bool is_empty() const {
return m_coeffs.empty(); // && is_zero(m_v);
return m_coeffs.empty();
}
unsigned size() const { return static_cast<unsigned>(m_coeffs.size()); }

3
src/util/lp/nla_solver.cpp
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@ -261,6 +261,9 @@ struct solver::imp {
lp::lar_term t;
t.add_coeff_var(a, j);
t.add_coeff_var(b, k);
if (t.is_empty() && rs.is_zero() &&
(cmp == lp::lconstraint_kind::LT || cmp == lp::lconstraint_kind::GT || cmp == lp::lconstraint_kind::NE))
return; // otherwise we get something like 0 < 0, which is always false and can be removed from the lemma
m_lemma->push_back(ineq(cmp, t, rs));
}

1
src/util/lp/ul_pair.h
View file

@ -29,7 +29,6 @@ namespace lp {
enum lconstraint_kind { LE = -2, LT = -1 , GE = 2, GT = 1, EQ = 0, NE = 3 };
inline bool kind_is_strict(lconstraint_kind kind) { return kind == LT || kind == GT;}
inline std::ostream& operator<<(std::ostream& out, lconstraint_kind k) {