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https://github.com/Z3Prover/z3
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preparing for more efficient asymmetric branching
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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@ -6335,7 +6335,7 @@ class Solver(Z3PPObject):
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def from_string(self, s):
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"""Parse assertions from a string"""
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Z3_solver_from_string(self.ctx.ref(), self.solver, filename)
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Z3_solver_from_string(self.ctx.ref(), self.solver, s)
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def assertions(self):
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"""Return an AST vector containing all added constraints.
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@ -56,25 +56,8 @@ namespace sat {
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<< " :time " << std::fixed << std::setprecision(2) << m_watch.get_seconds() << ")\n";);
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}
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};
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void asymm_branch::operator()(bool force) {
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++m_calls;
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if (m_calls <= 1)
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return;
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if (!m_asymm_branch && !m_asymm_branch_all)
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return;
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s.propagate(false); // must propagate, since it uses s.push()
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if (s.m_inconsistent)
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return;
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if (!force && m_counter > 0) {
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m_counter /= 100;
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return;
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}
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CASSERT("asymm_branch", s.check_invariant());
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TRACE("asymm_branch_detail", s.display(tout););
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report rpt(*this);
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svector<char> saved_phase(s.m_phase);
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m_counter = 0;
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void asymm_branch::process(clause_vector& clauses) {
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int64 limit = -m_asymm_branch_limit;
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std::stable_sort(s.m_clauses.begin(), s.m_clauses.end(), clause_size_lt());
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m_counter -= s.m_clauses.size();
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@ -114,6 +97,27 @@ namespace sat {
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m_counter = -m_counter;
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throw ex;
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}
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}
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void asymm_branch::operator()(bool force) {
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++m_calls;
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if (m_calls <= 1)
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return;
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if (!m_asymm_branch && !m_asymm_branch_all)
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return;
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s.propagate(false); // must propagate, since it uses s.push()
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if (s.m_inconsistent)
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return;
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if (!force && m_counter > 0) {
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m_counter /= 100;
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return;
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}
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CASSERT("asymm_branch", s.check_invariant());
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TRACE("asymm_branch_detail", s.display(tout););
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report rpt(*this);
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svector<char> saved_phase(s.m_phase);
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m_counter = 0;
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process(s.m_clauses);
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m_counter = -m_counter;
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s.m_phase = saved_phase;
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m_asymm_branch_limit *= 2;
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@ -44,6 +44,8 @@ namespace sat {
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unsigned m_elim_literals;
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bool process(clause & c);
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void process(clause_vector & c);
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bool process_all(clause & c);
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@ -176,6 +176,8 @@ namespace sat {
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m_reward_multiplier = 0.9;
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m_reward_offset = 1000000.0;
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m_variable_decay = p.variable_decay();
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// PB parameters
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s = p.pb_solver();
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if (s == symbol("circuit")) {
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@ -95,6 +95,8 @@ namespace sat {
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double m_simplify_mult2;
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unsigned m_simplify_max;
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unsigned m_variable_decay;
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gc_strategy m_gc_strategy;
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unsigned m_gc_initial;
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unsigned m_gc_increment;
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@ -2303,7 +2303,16 @@ namespace sat {
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*/
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void lookahead::add_hyper_binary() {
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std::cout << "binary trail size: " << m_binary_trail.size() << "\n";
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std::cout << "Are windfalls still on the trail at base level?\n";
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unsigned num_lits = m_s.num_vars() * 2;
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unsigned_vector bin_size(num_lits);
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for (unsigned idx : m_binary_trail) {
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bin_size[idx]++;
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}
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union_find_default_ctx ufctx;
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union_find<union_find_default_ctx> uf(ufctx);
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for (unsigned i = 0; i < num_lits; ++i) uf.mk_var();
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@ -9,6 +9,7 @@ def_module_params('sat',
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('restart.initial', UINT, 100, 'initial restart (number of conflicts)'),
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('restart.max', UINT, UINT_MAX, 'maximal number of restarts.'),
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('restart.factor', DOUBLE, 1.5, 'restart increment factor for geometric strategy'),
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('variable_decay', UINT, 120, 'multiplier (divided by 100) for the VSIDS activity increement'),
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('inprocess.max', UINT, UINT_MAX, 'maximal number of inprocessing passes'),
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('branching.heuristic', SYMBOL, 'vsids', 'branching heuristic vsids, lrb or chb'),
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('branching.anti_exploration', BOOL, False, 'apply anti-exploration heuristic for branch selection'),
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@ -1415,6 +1415,7 @@ namespace sat {
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m_next_simplify = 0;
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m_min_d_tk = 1.0;
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m_search_lvl = 0;
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m_conflicts_since_gc = 0;
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m_asymm_branch.init_search();
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m_stopwatch.reset();
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m_stopwatch.start();
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@ -1660,6 +1661,7 @@ namespace sat {
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void solver::gc() {
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if (m_conflicts_since_gc <= m_gc_threshold)
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return;
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IF_VERBOSE(1, verbose_stream() << "gc\n";);
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CASSERT("sat_gc_bug", check_invariant());
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switch (m_config.m_gc_strategy) {
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case GC_GLUE:
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@ -575,8 +575,8 @@ namespace sat {
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}
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void decay_activity() {
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m_activity_inc *= 11;
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m_activity_inc /= 10;
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m_activity_inc *= m_config.m_variable_decay;
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m_activity_inc /= 100;
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}
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private:
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@ -635,10 +635,8 @@ struct aig_manager::imp {
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}
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bool check_cache() const {
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obj_map<expr, aig_lit>::iterator it = m_cache.begin();
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obj_map<expr, aig_lit>::iterator end = m_cache.end();
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for (; it != end; ++it) {
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SASSERT(ref_count(it->m_value) > 0);
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for (auto const& kv : m_cache) {
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SASSERT(ref_count(kv.m_value) > 0);
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}
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return true;
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}
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@ -50,7 +50,7 @@ public:
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virtual solver* translate(ast_manager& dst_m, params_ref const& p) {
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flush_assertions();
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solver* result = alloc(pb2bv_solver, dst_m, p, m_solver->translate(dst_m, p));
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model_converter_ref mc = concat(mc0(), m_solver->get_model_converter().get());
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model_converter_ref mc = mc0();
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if (mc) {
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ast_translation tr(m, dst_m);
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result->set_model_converter(mc->translate(tr));
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