z3-z3-4.13.0.src.tactic.smtlogics.qfbv_tactic.cpp Maven / Gradle / Ivy
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/*++
Copyright (c) 2012 Microsoft Corporation
Module Name:
qfbv_tactic.cpp
Abstract:
Tactic for QF_BV based on bit-blasting
Author:
Leonardo (leonardo) 2012-02-22
Notes:
--*/
#include "tactic/tactical.h"
#include "tactic/core/simplify_tactic.h"
#include "tactic/core/propagate_values_tactic.h"
#include "tactic/core/solve_eqs_tactic.h"
#include "tactic/core/elim_uncnstr_tactic.h"
#include "tactic/bv/bit_blaster_tactic.h"
#include "tactic/bv/bv1_blaster_tactic.h"
#include "tactic/bv/max_bv_sharing_tactic.h"
#include "tactic/bv/bv_size_reduction_tactic.h"
#include "tactic/aig/aig_tactic.h"
#include "sat/tactic/sat_tactic.h"
#include "sat/sat_solver/inc_sat_solver.h"
#include "ackermannization/ackermannize_bv_tactic.h"
#include "tactic/smtlogics/smt_tactic.h"
#define MEMLIMIT 300
static tactic * mk_qfbv_preamble(ast_manager& m, params_ref const& p) {
params_ref solve_eq_p;
// conservative gaussian elimination.
solve_eq_p.set_uint("solve_eqs_max_occs", 2);
params_ref flat_and_or_p = p;
flat_and_or_p.set_bool("flat_and_or", false);
params_ref simp2_p = p;
simp2_p.set_bool("som", true);
simp2_p.set_bool("pull_cheap_ite", true);
simp2_p.set_bool("push_ite_bv", false);
simp2_p.set_bool("local_ctx", true);
simp2_p.set_uint("local_ctx_limit", 10000000);
simp2_p.set_bool("flat", true); // required by som
simp2_p.set_bool("hoist_mul", false); // required by som
simp2_p.set_bool("flat_and_or", false);
params_ref hoist_p;
hoist_p.set_bool("hoist_mul", true);
hoist_p.set_bool("som", false);
hoist_p.set_bool("flat_and_or", false);
return
and_then(
using_params(mk_simplify_tactic(m), flat_and_or_p),
using_params(mk_propagate_values_tactic(m), flat_and_or_p),
using_params(mk_solve_eqs_tactic(m), solve_eq_p),
mk_elim_uncnstr_tactic(m),
if_no_proofs(if_no_unsat_cores(mk_bv_size_reduction_tactic(m))),
using_params(mk_simplify_tactic(m), simp2_p),
//
// Z3 can solve a couple of extra benchmarks by using hoist_mul
// but the timeout in SMT-COMP is too small.
// Moreover, it impacted negatively some easy benchmarks.
// We should decide later, if we keep it or not.
//
using_params(mk_simplify_tactic(m), hoist_p),
mk_max_bv_sharing_tactic(m),
if_no_proofs(if_no_unsat_cores(mk_ackermannize_bv_tactic(m,p)))
);
}
static tactic * main_p(tactic* t) {
params_ref p;
p.set_bool("elim_and", true);
p.set_bool("push_ite_bv", true);
p.set_bool("blast_distinct", true);
return using_params(t, p);
}
static tactic * mk_qfbv_tactic(ast_manager& m, params_ref const & p, tactic* sat, tactic* smt) {
params_ref local_ctx_p = p;
local_ctx_p.set_bool("local_ctx", true);
local_ctx_p.set_bool("flat", false);
local_ctx_p.set_bool("flat_and_or", false);
params_ref solver_p;
solver_p.set_bool("preprocess", false); // preprocessor of smt::context is not needed.
tactic* preamble_st = mk_qfbv_preamble(m, p);
tactic * st = main_p(and_then(preamble_st,
// If the user sets HI_DIV0=false, then the formula may contain uninterpreted function
// symbols. In this case, we should not use the `sat', but instead `smt'. Alternatively,
// the UFs can be eliminated by eager ackermannization in the preamble.
cond(mk_is_qfbv_eq_probe(),
and_then(mk_bv1_blaster_tactic(m),
using_params(smt, solver_p)),
cond(mk_is_qfbv_probe(),
and_then(mk_bit_blaster_tactic(m),
when(mk_lt(mk_memory_probe(), mk_const_probe(MEMLIMIT)),
and_then(using_params(and_then(mk_simplify_tactic(m),
mk_solve_eqs_tactic(m)),
local_ctx_p),
if_no_proofs(mk_aig_tactic()))),
sat),
smt))));
st->updt_params(p);
return st;
}
tactic * mk_qfbv_tactic(ast_manager & m, params_ref const & p) {
tactic * new_sat = cond(mk_produce_proofs_probe(),
and_then(mk_simplify_tactic(m), mk_smt_tactic(m, p)),
mk_psat_tactic(m, p));
return mk_qfbv_tactic(m, p, new_sat, mk_smt_tactic(m, p));
}