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sketch bit-constraints

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-04-15 23:04:25 -07:00
parent dce9740a38
commit e970fe5034
8 changed files with 162 additions and 22 deletions
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10
src/math/polysat/eq_constraint.cpp
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@ -25,7 +25,6 @@ namespace polysat {
bool eq_constraint::propagate(solver& s, pvar v) {
LOG_H3("Propagate " << s.m_vars[v] << " in " << *this);
SASSERT(!vars().empty());
auto var = s.m_vars[v].var();
unsigned idx = 0;
if (vars()[idx] != v)
idx = 1;
@ -47,8 +46,6 @@ namespace polysat {
return false;
if (q.is_never_zero()) {
LOG("Conflict (never zero under current assignment)");
// we could tag constraint to allow early substitution before
// swapping watch variable in case we can detect conflict earlier.
s.set_conflict(*this);
return false;
}
@ -134,13 +131,18 @@ namespace polysat {
if (!a.resolve(v, b, r))
return nullptr;
p_dependency_ref d(s.m_dm.mk_join(c->dep(), dep()), s.m_dm);
// d = ;
unsigned lvl = std::max(c->level(), level());
return constraint::eq(lvl, r, d);
}
return nullptr;
}
void eq_constraint::narrow(solver& s) {
if (!p().is_linear())
return;
// TODO apply affine constraints and other that can be extracted cheaply
}
bool eq_constraint::is_always_false() {
return p().is_never_zero();
}