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fix #1762, #1764, #1768

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-07-26 20:29:26 +01:00
parent 259d4c4e43
commit d74978c277
15 changed files with 32 additions and 42 deletions
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8
src/util/lp/lar_solver.cpp
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@ -538,12 +538,16 @@ lp_status lar_solver::maximize_term(unsigned ext_j,
if (column_value_is_integer(j))
continue;
if (m_int_solver->is_base(j)) {
if (!remove_from_basis(j)) // consider a special version of remove_from_basis that would not remove inf_int columns
if (!remove_from_basis(j)) { // consider a special version of remove_from_basis that would not remove inf_int columns
m_mpq_lar_core_solver.m_r_x = backup;
return lp_status::FEASIBLE; // it should not happen
}
}
m_int_solver->patch_nbasic_column(j, false);
if (!column_value_is_integer(j))
if (!column_value_is_integer(j)) {
m_mpq_lar_core_solver.m_r_x = backup;
return lp_status::FEASIBLE;
}
change = true;
}
if (change) {