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compute polysat unsat core

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This commit is contained in:
Jakob Rath 2023-02-03 17:37:09 +01:00
parent 579275a17d
commit 1a733a3a50
3 changed files with 105 additions and 13 deletions
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30
src/math/polysat/solver.cpp
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@ -153,7 +153,7 @@ namespace polysat {
if (is_conflict())
return; // no need to do anything if we already have a conflict at base level
sat::literal lit = c.blit();
LOG("New constraint: " << c);
LOG("New constraint: " << lit_pp(*this, c));
switch (m_bvars.value(lit)) {
case l_false:
// Input literal contradicts current boolean state (e.g., opposite literals in the input)
@ -1085,6 +1085,21 @@ namespace polysat {
assign_eval(lit);
}
sat::literal solver::try_eval(sat::literal lit) {
signed_constraint const c = lit2cnstr(lit);
switch (c.eval(*this)) {
case l_true:
assign_eval(lit);
break;
case l_false:
assign_eval(~lit);
break;
default:
break;
}
return lit;
}
/**
* Activate constraint immediately
* Activation and de-activation of constraints follows the scope controlled by push/pop.
@ -1282,13 +1297,19 @@ namespace polysat {
void solver::report_unsat() {
backjump(base_level());
SASSERT(!m_conflict.empty());
VERIFY(!m_conflict.empty());
}
void solver::unsat_core(dependency_vector& deps) {
VERIFY(is_conflict());
deps.reset();
m_conflict.find_deps(deps);
IF_VERBOSE(10,
verbose_stream() << "polysat unsat_core";
for (auto d : deps)
verbose_stream() << " " << d;
verbose_stream() << "\n";
);
}
std::ostream& solver::display(std::ostream& out) const {
@ -1335,7 +1356,7 @@ namespace polysat {
}
std::ostream& lit_pp::display(std::ostream& out) const {
auto c = s.lit2cnstr(lit);
signed_constraint const c = s.lit2cnstr(lit);
out << lpad(5, lit) << ": " << rpad(30, c);
if (!c)
return out;
@ -1357,6 +1378,9 @@ namespace polysat {
out << " pwatched";
if (c->is_external())
out << " ext";
dependency const d = s.m_bvars.dep(lit);
if (!d.is_null())
out << " dep:" << d.val();
out << " ]";
return out;
}