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fixes to lookahead

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-06-08 17:25:06 -07:00
parent 964102726d
commit c870b77366
11 changed files with 40 additions and 11 deletions
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8
src/sat/sat_solver/inc_sat_solver.cpp
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@ -281,8 +281,10 @@ public:
}
virtual expr_ref lookahead(expr_ref_vector const& candidates) {
IF_VERBOSE(1, verbose_stream() << "(sat-lookahead " << candidates.size() << ")\n";);
sat::bool_var_vector vars;
expr_ref_vector lit2expr(m);
lit2expr.resize(m_solver.num_vars() * 2);
m_map.mk_inv(lit2expr);
for (auto c : candidates) {
sat::bool_var v = m_map.to_bool_var(c);
@ -290,17 +292,21 @@ public:
vars.push_back(v);
}
}
IF_VERBOSE(1, verbose_stream() << "vars: " << vars.size() << "\n";);
if (vars.empty()) {
return expr_ref(m.mk_true(), m);
}
sat::literal l = m_solver.select_lookahead(vars);
if (m_solver.inconsistent()) {
IF_VERBOSE(1, verbose_stream() << "(sat-lookahead inconsistent)\n";);
return expr_ref(m.mk_false(), m);
}
if (l == sat::null_literal) {
return expr_ref(m.mk_true(), m);
}
return expr_ref(lit2expr[l.index()].get(), m);
expr_ref result(lit2expr[l.index()].get(), m);
IF_VERBOSE(1, verbose_stream() << "solution: " << l << " " << result << "\n";);
return result;
}
virtual void get_lemmas(expr_ref_vector & lemmas) {
IF_VERBOSE(1, verbose_stream() << "(sat-get-lemmas " << lemmas.size() << ")\n";);