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implementing model updates

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-10-30 16:11:51 -05:00
parent 92b5301b7f
commit 3de8c193ea
63 changed files with 482 additions and 294 deletions
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66
src/tactic/arith/degree_shift_tactic.cpp
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@ -21,7 +21,7 @@ Revision History:
--*/
#include "tactic/tactical.h"
#include "tactic/filter_model_converter.h"
#include "tactic/extension_model_converter.h"
#include "tactic/generic_model_converter.h"
#include "util/cooperate.h"
#include "ast/arith_decl_plugin.h"
#include "tactic/core/simplify_tactic.h"
@ -127,9 +127,7 @@ class degree_shift_tactic : public tactic {
void visit_args(expr * t, expr_fast_mark1 & visited) {
if (is_app(t)) {
unsigned num_args = to_app(t)->get_num_args();
for (unsigned i = 0; i < num_args; i++) {
expr * arg = to_app(t)->get_arg(i);
for (expr * arg : *to_app(t)) {
save_degree(arg, m_one);
visit(arg, visited);
}
@ -166,11 +164,9 @@ class degree_shift_tactic : public tactic {
void display_candidates(std::ostream & out) {
out << "candidates:\n";
obj_map<app, rational>::iterator it = m_var2degree.begin();
obj_map<app, rational>::iterator end = m_var2degree.end();
for (; it != end; ++it) {
if (!it->m_value.is_one()) {
out << "POWER: " << it->m_value << "\n" << mk_ismt2_pp(it->m_key, m) << "\n";
for (auto const& kv : m_var2degree) {
if (!kv.m_value.is_one()) {
out << "POWER: " << kv.m_value << "\n" << mk_ismt2_pp(kv.m_key, m) << "\n";
}
}
}
@ -189,48 +185,42 @@ class degree_shift_tactic : public tactic {
void discard_non_candidates() {
m_pinned.reset();
ptr_vector<app> to_delete;
obj_map<app, rational>::iterator it = m_var2degree.begin();
obj_map<app, rational>::iterator end = m_var2degree.end();
for (; it != end; ++it) {
if (it->m_value.is_one())
to_delete.push_back(it->m_key);
for (auto const& kv : m_var2degree) {
if (kv.m_value.is_one())
to_delete.push_back(kv.m_key);
else
m_pinned.push_back(it->m_key); // make sure it is not deleted during simplifications
m_pinned.push_back(kv.m_key); // make sure it is not deleted during simplifications
}
ptr_vector<app>::iterator it2 = to_delete.begin();
ptr_vector<app>::iterator end2 = to_delete.end();
for (; it2 != end2; ++it2)
m_var2degree.erase(*it2);
for (app* a : to_delete)
m_var2degree.erase(a);
}
void prepare_substitution(model_converter_ref & mc) {
SASSERT(!m_var2degree.empty());
filter_model_converter * fmc = 0;
extension_model_converter * xmc = 0;
generic_model_converter * xmc = 0;
if (m_produce_models) {
fmc = alloc(filter_model_converter, m);
xmc = alloc(extension_model_converter, m);
xmc = alloc(generic_model_converter, m);
mc = concat(fmc, xmc);
}
obj_map<app, rational>::iterator it = m_var2degree.begin();
obj_map<app, rational>::iterator end = m_var2degree.end();
for (; it != end; ++it) {
SASSERT(it->m_value.is_int());
SASSERT(it->m_value >= rational(2));
app * fresh = m.mk_fresh_const(0, it->m_key->get_decl()->get_range());
for (auto const& kv : m_var2degree) {
SASSERT(kv.m_value.is_int());
SASSERT(kv.m_value >= rational(2));
app * fresh = m.mk_fresh_const(0, kv.m_key->get_decl()->get_range());
m_pinned.push_back(fresh);
m_var2var.insert(it->m_key, fresh);
m_var2var.insert(kv.m_key, fresh);
if (m_produce_models) {
fmc->insert(fresh->get_decl());
xmc->insert(it->m_key->get_decl(), mk_power(fresh, rational(1)/it->m_value));
xmc->add(kv.m_key->get_decl(), mk_power(fresh, rational(1)/kv.m_value));
}
if (m_produce_proofs) {
expr * s = mk_power(it->m_key, it->m_value);
expr * s = mk_power(kv.m_key, kv.m_value);
expr * eq = m.mk_eq(fresh, s);
proof * pr1 = m.mk_def_intro(eq);
proof * result_pr = m.mk_apply_def(fresh, s, pr1);
m_pinned.push_back(result_pr);
m_var2pr.insert(it->m_key, result_pr);
m_var2pr.insert(kv.m_key, result_pr);
}
}
}
@ -267,17 +257,15 @@ class degree_shift_tactic : public tactic {
}
// add >= 0 constraints for variables with even degree
obj_map<app, rational>::iterator it = m_var2degree.begin();
obj_map<app, rational>::iterator end = m_var2degree.end();
for (; it != end; ++it) {
SASSERT(it->m_value.is_int());
SASSERT(it->m_value >= rational(2));
if (it->m_value.is_even()) {
app * new_var = m_var2var.find(it->m_key);
for (auto const& kv : m_var2degree) {
SASSERT(kv.m_value.is_int());
SASSERT(kv.m_value >= rational(2));
if (kv.m_value.is_even()) {
app * new_var = m_var2var.find(kv.m_key);
app * new_c = m_autil.mk_ge(new_var, m_autil.mk_numeral(rational(0), false));
proof * new_pr = 0;
if (m_produce_proofs) {
proof * pr = m_var2pr.find(it->m_key);
proof * pr = m_var2pr.find(kv.m_key);
new_pr = m.mk_th_lemma(m_autil.get_family_id(), new_c, 1, &pr);
}
g->assert_expr(new_c, new_pr, 0);