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Z3 sources

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
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Leonardo de Moura 2012-10-02 11:35:25 -07:00
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lib/qfbv_tactic.cpp Normal file
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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"tactical.h"
#include"simplify_tactic.h"
#include"propagate_values_tactic.h"
#include"solve_eqs_tactic.h"
#include"elim_uncnstr_tactic.h"
#include"smt_tactic.h"
#include"bit_blaster_tactic.h"
#include"bv1_blaster_tactic.h"
#include"max_bv_sharing_tactic.h"
#include"bv_size_reduction_tactic.h"
#include"aig_tactic.h"
#include"sat_tactic.h"
#define MEMLIMIT 300
tactic * mk_qfbv_tactic(ast_manager & m, params_ref const & p) {
params_ref main_p;
main_p.set_bool(":elim-and", true);
main_p.set_bool(":push-ite-bv", true);
main_p.set_bool(":blast-distinct", true);
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);
params_ref local_ctx_p = p;
local_ctx_p.set_bool(":local-ctx", true);
params_ref solver_p;
solver_p.set_bool(":preprocess", false); // preprocessor of smt::context is not needed.
params_ref no_flat_p;
no_flat_p.set_bool(":flat", false);
params_ref ctx_simp_p;
ctx_simp_p.set_uint(":max-depth", 32);
ctx_simp_p.set_uint(":max-steps", 50000000);
params_ref hoist_p;
hoist_p.set_bool(":hoist-mul", true);
hoist_p.set_bool(":som", false);
params_ref solve_eq_p;
// conservative guassian elimination.
solve_eq_p.set_uint(":solve-eqs-max-occs", 2);
params_ref big_aig_p;
big_aig_p.set_bool(":aig-per-assertion", false);
tactic * preamble_st = and_then(and_then(mk_simplify_tactic(m),
mk_propagate_values_tactic(m),
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));
#ifdef USE_OLD_SAT_SOLVER
tactic * new_sat = and_then(mk_simplify_tactic(m),
mk_smt_tactic());
#else
tactic * new_sat = cond(mk_or(mk_produce_proofs_probe(), mk_produce_unsat_cores_probe()),
and_then(mk_simplify_tactic(m),
mk_smt_tactic()),
mk_sat_tactic(m));
#endif
tactic * st = using_params(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
cond(mk_is_qfbv_probe(),
cond(mk_is_qfbv_eq_probe(),
and_then(mk_bv1_blaster_tactic(m),
using_params(mk_smt_tactic(), solver_p)),
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(cond(mk_produce_unsat_cores_probe(),
mk_aig_tactic(),
using_params(mk_aig_tactic(),
big_aig_p))))),
new_sat)),
mk_smt_tactic())),
main_p);
st->updt_params(p);
return st;
}