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Merge pull request #1771 from levnach/bugfix

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a fix in maximize_term
This commit is contained in:
Nikolaj Bjorner 2018-07-27 10:58:42 +01:00 • committed by GitHub
commit db679d702f
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3 changed files with 25 additions and 2 deletions
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1
src/util/lp/int_solver.h
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@ -50,7 +50,6 @@ public:
// main function to check that the solution provided by lar_solver is valid for integral values,
// or provide a way of how it can be adjusted.
lia_move check(lar_term& t, mpq& k, explanation& ex, bool & upper);
lia_move check_(lar_term& t, mpq& k, explanation& ex, bool & upper);
bool move_non_basic_column_to_bounds(unsigned j);
lia_move check_wrapper(lar_term& t, mpq& k, explanation& ex);
bool is_base(unsigned j) const;

5
src/util/lp/lar_solver.cpp
View file

@ -542,8 +542,11 @@ lp_status lar_solver::maximize_term(unsigned ext_j,
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)) {
term_max = prev_value;
m_mpq_lar_core_solver.m_r_x = backup;
return lp_status::FEASIBLE;
}
change = true;
}
if (change) {

21
src/util/lp/lia_move.h
View file

@ -28,4 +28,25 @@ enum class lia_move {
undef,
unsat
};
inline std::string lia_move_to_string(lia_move m) {
switch (m) {
case lia_move::sat:
return "sat";
case lia_move::branch:
return "branch";
case lia_move::cut:
return "cut";
case lia_move::conflict:
return "conflict";
case lia_move::continue_with_check:
return "continue_with_check";
case lia_move::undef:
return "undef";
case lia_move::unsat:
return "unsat";
default:
lp_assert(false);
};
return "strange";
}
}