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bug fixes

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values cannot change on basic variables from inequalities
arithmetic modulo can produce 0 coefficients
This commit is contained in:
Nikolaj Bjorner 2021-08-31 11:26:44 -07:00
parent d1118cb178
commit 05d564e828
3 changed files with 33 additions and 14 deletions
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8
src/math/polysat/fixplex_def.h
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@ -844,9 +844,8 @@ namespace polysat {
unsigned rz = r_z.id();
if (rz == rx)
continue;
TRACE("fixplex,", display_row(tout << "eliminate ", r_z, false) << "\n";);
VERIFY(eliminate_var(r_x, col, tz_b, old_value_y));
TRACE("fixplex,", display_row(tout << "eliminated ", r_z, false) << "\n";);
TRACE("fixplex", display_row(tout << "eliminated ", r_z, false) << "\n";);
add_patch(row2base(r_z));
}
SASSERT(well_formed());
@ -1345,7 +1344,7 @@ namespace polysat {
if (m_vars[v].max() >= m_vars[w].max() && !new_bound(i, v, 0, m_vars[w].max(), vlo, vhi, wlo, whi))
return false;
if (value(v) >= value(w) && value(v) + 1 != 0 && m_vars[w].contains(value(v) + 1))
if (!is_base(w) && value(v) >= value(w) && value(v) + 1 != 0 && m_vars[w].contains(value(v) + 1))
update_value(w, value(v) - value(w) + 1);
return true;
@ -1364,7 +1363,7 @@ namespace polysat {
if (m_vars[v].max() > m_vars[w].max() && !new_bound(i, v, 0, m_vars[w].max() + 1, vlo, vhi, wlo, whi))
return false;
if (value(v) > value(w) && m_vars[w].contains(value(v)))
if (value(v) > value(w) && !is_base(w) && m_vars[w].contains(value(v)))
update_value(w, value(v) - value(w));
return true;
@ -1475,6 +1474,7 @@ namespace polysat {
if (s == null_var)
continue;
SASSERT(i == base2row(s).id());
VERIFY(well_formed_row(r));
}
for (unsigned i = 0; i < m_vars.size(); ++i) {