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add simplification with qe-lite as an option #5767

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2022-01-12 03:41:21 -08:00
parent 08294d62e5
commit 56d3718cde
8 changed files with 36 additions and 41 deletions
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2
src/qe/lite/qe_lite.h
View file

@ -60,6 +60,8 @@ public:
\brief full rewriting based light-weight quantifier elimination round.
*/
void operator()(expr_ref& fml, proof_ref& pr);
void operator()(expr* fml, expr_ref& result, proof_ref& pr) { result = fml; (*this)(result, pr); }
};
tactic * mk_qe_lite_tactic(ast_manager & m, params_ref const & p = params_ref());

6
src/sat/smt/pb_solver.cpp
View file

@ -1403,8 +1403,10 @@ namespace pb {
if (m_solver) m_solver->set_external(lit.var());
c->watch_literal(*this, lit);
c->watch_literal(*this, ~lit);
}
SASSERT(c->well_formed());
}
if (!c->well_formed())
std::cout << *c << "\n";
VERIFY(c->well_formed());
if (m_solver && m_solver->get_config().m_drat) {
std::function<void(std::ostream& out)> fn = [&](std::ostream& out) {
out << "c ba constraint " << *c << " 0\n";

1
src/smt/params/qi_params.cpp
View file

@ -28,6 +28,7 @@ void qi_params::updt_params(params_ref const & _p) {
m_mbqi_trace = p.mbqi_trace();
m_mbqi_force_template = p.mbqi_force_template();
m_mbqi_id = p.mbqi_id();
m_qe_lite = p.q_lite();
m_qi_profile = p.qi_profile();
m_qi_profile_freq = p.qi_profile_freq();
m_qi_max_instances = p.qi_max_instances();

60
src/smt/params/qi_params.h
View file

@ -30,26 +30,27 @@ enum quick_checker_mode {
struct qi_params {
std::string m_qi_cost;
std::string m_qi_new_gen;
double m_qi_eager_threshold;
double m_qi_lazy_threshold;
unsigned m_qi_max_eager_multipatterns;
unsigned m_qi_max_lazy_multipattern_matching;
bool m_qi_profile;
unsigned m_qi_profile_freq;
quick_checker_mode m_qi_quick_checker;
bool m_qi_lazy_quick_checker;
bool m_qi_promote_unsat;
unsigned m_qi_max_instances;
bool m_qi_lazy_instantiation;
bool m_qi_conservative_final_check;
double m_qi_eager_threshold = 10.0;
double m_qi_lazy_threshold = 20.0;
unsigned m_qi_max_eager_multipatterns = 0;
unsigned m_qi_max_lazy_multipattern_matching = 2;
bool m_qi_profile = false;
unsigned m_qi_profile_freq = UINT_MAX;
quick_checker_mode m_qi_quick_checker = MC_NO;
bool m_qi_lazy_quick_checker = true;
bool m_qi_promote_unsat = true;
unsigned m_qi_max_instances = UINT_MAX;
bool m_qi_lazy_instantiation = false;
bool m_qi_conservative_final_check = false;
bool m_qe_lite = false;
bool m_mbqi;
unsigned m_mbqi_max_cexs;
unsigned m_mbqi_max_cexs_incr;
unsigned m_mbqi_max_iterations;
bool m_mbqi_trace;
unsigned m_mbqi_force_template;
const char * m_mbqi_id;
bool m_mbqi = true;
unsigned m_mbqi_max_cexs = 1;
unsigned m_mbqi_max_cexs_incr = 1;
unsigned m_mbqi_max_iterations = 1000;
bool m_mbqi_trace = false;
unsigned m_mbqi_force_template = 10;
const char * m_mbqi_id = nullptr;
qi_params(params_ref const & p = params_ref()):
/*
@ -78,26 +79,7 @@ struct qi_params {
matching loop detection.
*/
m_qi_cost("(+ weight generation)"),
m_qi_new_gen("cost"),
m_qi_eager_threshold(10.0),
m_qi_lazy_threshold(20.0), // reduced to give a chance to MBQI
m_qi_max_eager_multipatterns(0),
m_qi_max_lazy_multipattern_matching(2),
m_qi_profile(false),
m_qi_profile_freq(UINT_MAX),
m_qi_quick_checker(MC_NO),
m_qi_lazy_quick_checker(true),
m_qi_promote_unsat(true),
m_qi_max_instances(UINT_MAX),
m_qi_lazy_instantiation(false),
m_qi_conservative_final_check(false),
m_mbqi(true), // enabled by default
m_mbqi_max_cexs(1),
m_mbqi_max_cexs_incr(1),
m_mbqi_max_iterations(1000),
m_mbqi_trace(false),
m_mbqi_force_template(10),
m_mbqi_id(nullptr)
m_qi_new_gen("cost")
{
updt_params(p);
}

1
src/smt/params/smt_params_helper.pyg
View file

@ -35,6 +35,7 @@ def_module_params(module_name='smt',
('mbqi.force_template', UINT, 10, 'some quantifiers can be used as templates for building interpretations for functions. Z3 uses heuristics to decide whether a quantifier will be used as a template or not. Quantifiers with weight >= mbqi.force_template are forced to be used as a template'),
('mbqi.id', STRING, '', 'Only use model-based instantiation for quantifiers with id\'s beginning with string'),
('q.lift_ite', UINT, 0, '0 - don not lift non-ground if-then-else, 1 - use conservative ite lifting, 2 - use full lifting of if-then-else under quantifiers'),
('q.lite', BOOL, False, 'Use cheap quantifier elimination during pre-processing'),
('qi.profile', BOOL, False, 'profile quantifier instantiation'),
('qi.profile_freq', UINT, UINT_MAX, 'how frequent results are reported by qi.profile'),
('qi.max_instances', UINT, UINT_MAX, 'maximum number of quantifier instantiations'),

1
src/solver/assertions/CMakeLists.txt
View file

@ -4,4 +4,5 @@ z3_add_component(solver_assertions
COMPONENT_DEPENDENCIES
smt2parser
smt_params
qe_lite
)

2
src/solver/assertions/asserted_formulas.cpp
View file

@ -49,6 +49,7 @@ asserted_formulas::asserted_formulas(ast_manager & m, smt_params & sp, params_re
m_refine_inj_axiom(*this),
m_max_bv_sharing_fn(*this),
m_elim_term_ite(*this),
m_qe_lite(*this),
m_pull_nested_quantifiers(*this),
m_elim_bvs_from_quantifiers(*this),
m_cheap_quant_fourier_motzkin(*this),
@ -285,6 +286,7 @@ void asserted_formulas::reduce() {
m_ng_lift_ite.m_functor.set_conservative(m_smt_params.m_ng_lift_ite == lift_ite_kind::LI_CONSERVATIVE);
if (!invoke(m_ng_lift_ite)) return;
if (!invoke(m_elim_term_ite)) return;
if (!invoke(m_qe_lite)) return;
if (!invoke(m_refine_inj_axiom)) return;
if (!invoke(m_distribute_forall)) return;
if (!invoke(m_find_macros)) return;

4
src/solver/assertions/asserted_formulas.h
View file

@ -37,6 +37,7 @@ Revision History:
#include "ast/normal_forms/elim_term_ite.h"
#include "ast/pattern/pattern_inference.h"
#include "smt/params/smt_params.h"
#include "qe/lite/qe_lite.h"
class asserted_formulas {
@ -190,6 +191,8 @@ class asserted_formulas {
MK_SIMPLIFIERF(lift_ite, push_app_ite_rw, "lift-ite", af.m_smt_params.m_lift_ite != lift_ite_kind::LI_NONE, true);
MK_SIMPLIFIERF(ng_lift_ite, ng_push_app_ite_rw, "lift-ite", af.m_smt_params.m_ng_lift_ite != lift_ite_kind::LI_NONE, true);
MK_SIMPLIFIERA(qe_lite_fn, qe_lite, "qe-lite", af.m_smt_params.m_qe_lite && af.has_quantifiers(), (af.m, af.m_params), true);
reduce_asserted_formulas_fn m_reduce_asserted_formulas;
distribute_forall_fn m_distribute_forall;
@ -197,6 +200,7 @@ class asserted_formulas {
refine_inj_axiom_fn m_refine_inj_axiom;
max_bv_sharing_fn m_max_bv_sharing_fn;
elim_term_ite_fn m_elim_term_ite;
qe_lite_fn m_qe_lite;
pull_nested_quantifiers m_pull_nested_quantifiers;
elim_bvs_from_quantifiers m_elim_bvs_from_quantifiers;
cheap_quant_fourier_motzkin m_cheap_quant_fourier_motzkin;