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conflict

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-11-19 08:23:50 -08:00
parent caaefef847
commit b0bf03457c
3 changed files with 69 additions and 3 deletions
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26
src/math/polysat/ule_constraint.cpp
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@ -129,6 +129,31 @@ namespace polysat {
return;
}
#if 0
// setup with viable2:
// we no longer need cjust
pvar v = null_var;
if (p.is_unilinear())
v = p.var();
else if (q.is_unilinear())
v = q.var();
if (v != null_var) {
signed_constraint sc(this, is_positive);
s.m_viable2.intersect(v, sc);
rational val;
switch (s.m_viable2.find_viable(v, val)) {
case dd::find_t::singleton:
s.propagate(v, val, sc);
break;
case dd::find_t::empty:
s.set_conflict(v);
break;
default:
break;
}
}
#else
// p <= 0, e.g., p == 0
if (q.is_zero() && p.is_unilinear()) {
// a*x + b == 0
@ -184,6 +209,7 @@ namespace polysat {
}
// TODO: other cheap constraints possible?
#endif
}
bool ule_constraint::is_always_false(bool is_positive, pdd const& lhs, pdd const& rhs) const {