mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-24 17:45:32 +00:00
Code Activity

profile and remove dead code from dioph_eq.cpp

Browse source 
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2025-03-10 14:58:19 -10:00 • committed by Lev Nachmanson
parent 6f7b749ff9
commit a522e81652
1 changed files with 31 additions and 94 deletions
Download patch file Download diff file Expand all files Collapse all files

125
src/math/lp/dioph_eq.cpp
View file

@ -594,8 +594,16 @@ namespace lp {
m_in_q.remove(j);
return j;
}
void reset() {
while (!m_q.empty())
m_q.pop();
m_in_q.reset();
}
};
protected_queue m_q;
struct undo_fixed_column : public trail {
imp& m_imp;
unsigned m_j; // the column that has been added
@ -730,7 +738,7 @@ namespace lp {
CTRACE("dioph_eq", !lra.column_has_term(j), tout << "added term that is not associated with a column yet" << std::endl;);
if (!all_vars_are_int(*t)) {
if (!lia.column_is_int(t->j())) {
TRACE("dioph_eq", tout << "not all vars are integrall\n";);
return;
}
@ -820,18 +828,18 @@ namespace lp {
}
void subs_entry(unsigned ei) {
if (ei >= m_e_matrix.row_count()) return;
// q is the queue of variables that can be substituted in ei
protected_queue q;
// m_q is the queue of variables that can be substituted in ei
m_q.reset();
for (const auto& p : m_e_matrix.m_rows[ei]) {
if (can_substitute(p.var()))
q.push(p.var());
m_q.push(p.var());
}
if (q.size() == 0) return;
substitute_on_q(q, ei);
if (m_q.size() == 0) return;
substitute_on_q(ei);
SASSERT(entry_invariant(ei));
}
void substitute_on_q_with_entry_in_S(protected_queue& q, unsigned ei, unsigned j, const mpq& alpha) {
void substitute_on_q_with_entry_in_S(unsigned ei, unsigned j, const mpq& alpha) {
unsigned ei_to_sub = m_k2s[j];
int sign_j = get_sign_in_e_row(ei_to_sub, j);
// we need to eliminate alpha*j in ei's row
@ -839,10 +847,10 @@ namespace lp {
for (const auto& p : m_e_matrix.m_rows[ei]) {
unsigned jj = p.var();
if (can_substitute(jj))
q.push(jj);
m_q.push(jj);
}
}
void substitute_with_fresh_def(protected_queue& q, unsigned ei, unsigned j, const mpq& alpha) {
void substitute_with_fresh_def(unsigned ei, unsigned j, const mpq& alpha) {
const lar_term& sub_term = m_fresh_k2xt_terms.get_by_key(j).first;
TRACE("dioph_eq", print_lar_term_L(sub_term, tout) << std::endl;);
SASSERT(sub_term.get_coeff(j).is_one());
@ -851,21 +859,21 @@ namespace lp {
for (const auto& p : m_e_matrix.m_rows[ei]) {
unsigned jj = p.var();
if (can_substitute(jj))
q.push(jj);
m_q.push(jj);
}
}
// q is the queue of variables that can be substituted in ei
void substitute_on_q(protected_queue& q, unsigned ei) {
while (!q.empty()) {
unsigned j = q.pop_front();
void substitute_on_q(unsigned ei) {
while (!m_q.empty()) {
unsigned j = m_q.pop_front();
mpq alpha = get_coeff_in_e_row(ei, j);
if (alpha.is_zero()) continue;
if (m_k2s.has_key(j)) {
substitute_on_q_with_entry_in_S(q, ei, j, alpha);
substitute_on_q_with_entry_in_S(ei, j, alpha);
}
else {
substitute_with_fresh_def(q, ei, j, alpha);
substitute_with_fresh_def(ei, j, alpha);
}
}
}
@ -889,14 +897,6 @@ namespace lp {
m_sum_of_fixed[i1] += coeff * m_sum_of_fixed[i0];
}
bool all_vars_are_int(const lar_term& term) const {
for (const auto& p : term) {
if (!lia.column_is_int(p.var()))
return false;
}
return lia.column_is_int(term.j());
}
void clear_e_row(unsigned ei) {
auto& row = m_e_matrix.m_rows[ei];
while (row.size() > 0) {
@ -1185,13 +1185,6 @@ namespace lp {
return false;
}
void init_term_from_constraint(term_o& t, const lar_base_constraint& c) {
for (const auto& p : c.coeffs()) {
t.add_monomial(p.first, p.second);
}
t.c() = -c.rhs();
}
void subs_qfront_by_fresh(unsigned k, protected_queue& q) {
const lar_term& e = m_fresh_k2xt_terms.get_by_key(k).first;
TRACE("dioph_eq", tout << "k:" << k << ", in ";
@ -1291,18 +1284,6 @@ namespace lp {
return ret;
}
term_o create_term_from_l(const lar_term& l) {
term_o ret;
for (const auto& p : l) {
const auto& t = lra.get_term(local_to_lar_solver(p.j()));
ret.add_monomial(-mpq(1), p.j());
for (const auto& q : t) {
ret.add_monomial(p.coeff() * q.coeff(), q.j());
}
}
return ret;
}
bool is_fixed(unsigned j) const {
return lra.column_is_fixed(j);
}
@ -1421,18 +1402,6 @@ namespace lp {
return r;
}
#if 0
std::ostream& print_queue(std::queue<unsigned> q, std::ostream& out) {
out << "qu: ";
while (!q.empty()) {
out << q.front() << " ";
q.pop();
}
out << std::endl;
return out;
}
#endif
term_o create_term_from_espace() const {
term_o t;
for (const auto& p : m_espace.m_data) {
@ -1483,24 +1452,20 @@ namespace lp {
/* j is the index of the column representing a term
Return lia_move::conflict if a conflict was found, lia_move::continue_with_check if j became a fixed variable, and undef
otherwise
Let us say we have a constraint x + y <= 8, and after the substitutions with S and fresh variables
we have x+y = 7t - 1 <= 8, where t is a term. Then we have 7t <= 9, or t <= 9/7, or we can enforce t <= floor(9/7) = 1.
When we have a constraint x + y <= 8 then after the substitutions with S and fresh variables
we might have x + y = 7t - 1 <= 8, where t is a term. Then 7t <= 9, or t <= 9/7, and we can enforce t <= floor(9/7) = 1.
Then x + y = 7*1 - 1 <= 6: the bound is strenthgened. The constraint in this example comes from the upper bound on j, where
j is the slack variable in x+y + j = 0.
*/
j is the slack variable in x + y - j = 0.
*/
lia_move tighten_bounds_for_term_column(unsigned j) {
term_o term_to_tighten = lra.get_term(j); // copy the term aside
if (!all_vars_are_int(term_to_tighten))
return lia_move::undef;
// q is the queue of variables that can be substituted in term_to_tighten
protected_queue q;
TRACE("dio", tout << "j:" << j << " , intitial term t: "; print_lar_term_L(term_to_tighten, tout) << std::endl;
for( const auto& p : term_to_tighten) {
TRACE("dio", tout << "j:" << j << " , intitial term t: "; print_lar_term_L(lra.get_term(j), tout) << std::endl;
for( const auto& p : lra.get_term(j)) {
lra.print_column_info(p.var(), tout);
}
);
init_substitutions(term_to_tighten, q);
init_substitutions(lra.get_term(j), q);
if (q.empty()) // todo: maybe still go ahead and process it?
return lia_move::undef;
@ -1690,7 +1655,6 @@ namespace lp {
}
return lia_move::undef;
}
unsigned m_n_of_lemmas = 0;
// returns true only on a conflict
bool tighten_bound_kind(const mpq& g, unsigned j, const mpq& ub, bool upper) {
// ub = (upper_bound(j) - m_c)/g.
@ -1721,10 +1685,6 @@ namespace lp {
print_lar_term_L(lra.get_term(j), tout) << "\ndep:";
print_deps(tout, dep) << std::endl;);
lra.update_column_type_and_bound(j, kind, bound, dep);
if (lra.settings().dump_bound_lemmas()) {
std::string lemma_name = "lemma" + std::to_string(m_n_of_lemmas++);
lra.write_bound_lemma_to_file(j, !upper, lemma_name, std::string( __FILE__)+ ","+ std::to_string(__LINE__));
}
lp_status st = lra.find_feasible_solution();
if ((int)st >= (int)lp::lp_status::FEASIBLE) {
@ -2069,7 +2029,7 @@ namespace lp {
std::unordered_map<unsigned, std::unordered_set<unsigned>> c2t;
for (unsigned k = 0; k < lra.terms().size(); k++) {
const lar_term* t = lra.terms()[k];
if (!all_vars_are_int(*t)) continue;
if (!lia.column_is_int(t->j())) continue;
SASSERT(t->j() != UINT_MAX);
for (const auto& p : (*t).ext_coeffs()) {
unsigned j = p.var();
@ -2159,12 +2119,6 @@ namespace lp {
}
private:
void add_operator(lar_term& t, const mpq& k, const lar_term& l) {
for (const auto& p : l) {
t.add_monomial(k * p.coeff(), p.j());
}
}
unsigned get_markovich_number(unsigned k, unsigned h) {
size_t col_size = m_e_matrix.m_columns[k].size();
size_t row_size = m_e_matrix.m_rows[h].size();
@ -2193,23 +2147,6 @@ namespace lp {
return std::make_tuple(ahk, k, k_sign, get_markovich_number(k, ei));
}
term_o get_term_to_subst(const term_o& eh, unsigned k, int k_sign) {
term_o t;
for (const auto& p : eh) {
if (p.j() == k)
continue;
t.add_monomial(-k_sign * p.coeff(), p.j());
}
t.c() = -k_sign * eh.c();
TRACE("dio", tout << "subst_term:";
print_term_o(t, tout) << std::endl;);
return t;
}
std::ostream& print_e_row(unsigned i, std::ostream& out) {
return print_term_o(get_term_from_entry(i), out);
}
bool j_sign_is_correct(unsigned ei, unsigned j, int j_sign) {
const auto& row = m_e_matrix.m_rows[ei];
auto it = std::find_if(row.begin(), row.end(), [j](const auto& p) { return p.var() == j; });