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fix model generation for non-linear expressions, reported by Martin Suda and Giles Reger

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-02-11 12:02:32 -05:00
parent 3a0e9e8f53
commit b42973152f
3 changed files with 15 additions and 4 deletions
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1
src/smt/theory_arith.h
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@ -946,6 +946,7 @@ namespace smt {
//
// -----------------------------------
typedef int_hashtable<int_hash, default_eq<int> > row_set;
bool m_model_depends_on_computed_epsilon;
unsigned m_nl_rounds;
bool m_nl_gb_exhausted;
unsigned m_nl_strategy_idx; // for fairness

6
src/smt/theory_arith_core.h
View file

@ -1405,6 +1405,7 @@ namespace smt {
template<typename Ext>
final_check_status theory_arith<Ext>::final_check_core() {
m_model_depends_on_computed_epsilon = false;
unsigned old_idx = m_final_check_idx;
final_check_status result = FC_DONE;
final_check_status ok;
@ -1669,6 +1670,7 @@ namespace smt {
m_liberal_final_check(true),
m_changed_assignment(false),
m_assume_eq_head(0),
m_model_depends_on_computed_epsilon(false),
m_nl_rounds(0),
m_nl_gb_exhausted(false),
m_nl_new_exprs(m),
@ -3220,7 +3222,9 @@ namespace smt {
m_factory = alloc(arith_factory, get_manager());
m.register_factory(m_factory);
compute_epsilon();
refine_epsilon();
if (!m_model_depends_on_computed_epsilon) {
refine_epsilon();
}
}
template<typename Ext>

12
src/smt/theory_arith_nl.h
View file

@ -638,6 +638,7 @@ namespace smt {
if (!val.get_infinitesimal().is_zero() && !computed_epsilon) {
compute_epsilon();
computed_epsilon = true;
m_model_depends_on_computed_epsilon = true;
}
return val.get_rational().to_rational() + m_epsilon.to_rational() * val.get_infinitesimal().to_rational();
}
@ -652,14 +653,18 @@ namespace smt {
bool theory_arith<Ext>::check_monomial_assignment(theory_var v, bool & computed_epsilon) {
SASSERT(is_pure_monomial(var2expr(v)));
expr * m = var2expr(v);
rational val(1);
rational val(1), v_val;
for (unsigned i = 0; i < to_app(m)->get_num_args(); i++) {
expr * arg = to_app(m)->get_arg(i);
theory_var curr = expr2var(arg);
SASSERT(curr != null_theory_var);
val *= get_value(curr, computed_epsilon);
v_val = get_value(curr, computed_epsilon);
TRACE("non_linear", tout << mk_pp(arg, get_manager()) << " = " << v_val << "\n";);
val *= v_val;
}
return get_value(v, computed_epsilon) == val;
v_val = get_value(v, computed_epsilon);
TRACE("non_linear", tout << "v" << v << " := " << v_val << " == " << val << "\n";);
return v_val == val;
}
@ -2356,6 +2361,7 @@ namespace smt {
*/
template<typename Ext>
final_check_status theory_arith<Ext>::process_non_linear() {
m_model_depends_on_computed_epsilon = false;
if (m_nl_monomials.empty())
return FC_DONE;