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Arith min max (#6864)

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* prepare for dependencies

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* snapshot

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* more refactoring

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* more refactoring

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* build

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* pass in u_dependency_manager

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* address NYIs

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* more refactoring names

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* eq_explanation update

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* add outline of bounds improvement functionality

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* fix unit tests

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* remove unused structs

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* more bounds

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* more bounds

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* convert more internals to use u_dependency instead of constraint_index

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* convert more internals to use u_dependency instead of constraint_index

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* remember to push/pop scopes

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* use the main function for updating bounds

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* na

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* na

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* remove reset of shared dep manager

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* disable improve-bounds, add statistics

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

---------

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-08-19 17:44:09 -07:00 • committed by GitHub
parent c3b344ec47
commit 5e3df9ee77
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40 changed files with 630 additions and 529 deletions
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24
src/math/lp/nla_core.h
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@ -64,6 +64,7 @@ class core {
unsigned m_nla_explanations;
unsigned m_nla_lemmas;
unsigned m_nra_calls;
unsigned m_bounds_improvements;
stats() { reset(); }
void reset() {
memset(this, 0, sizeof(*this));
@ -79,7 +80,7 @@ class core {
var_eqs<emonics> m_evars;
lp::lar_solver& m_lar_solver;
lp::lar_solver& lra;
reslimit& m_reslim;
smt_params_helper m_params;
std::function<bool(lpvar)> m_relevant;
@ -110,6 +111,9 @@ class core {
void check_weighted(unsigned sz, std::pair<unsigned, std::function<void(void)>>* checks);
// try to improve bounds for variables in monomials.
bool improve_bounds();
public:
// constructor
core(lp::lar_solver& s, params_ref const& p, reslimit&);
@ -142,13 +146,13 @@ public:
bool ineq_holds(const ineq& n) const;
bool lemma_holds(const lemma& l) const;
bool is_monic_var(lpvar j) const { return m_emons.is_monic_var(j); }
const rational& val(lpvar j) const { return m_lar_solver.get_column_value(j).x; }
const rational& val(lpvar j) const { return lra.get_column_value(j).x; }
const rational& var_val(const monic& m) const { return m_lar_solver.get_column_value(m.var()).x; }
const rational& var_val(const monic& m) const { return lra.get_column_value(m.var()).x; }
rational mul_val(const monic& m) const {
rational r(1);
for (lpvar v : m.vars()) r *= m_lar_solver.get_column_value(v).x;
for (lpvar v : m.vars()) r *= lra.get_column_value(v).x;
return r;
}
@ -287,16 +291,16 @@ public:
}
const rational& get_upper_bound(unsigned j) const;
const rational& get_lower_bound(unsigned j) const;
bool has_lower_bound(lp::var_index var, lp::constraint_index& ci, lp::mpq& value, bool& is_strict) const {
return m_lar_solver.has_lower_bound(var, ci, value, is_strict);
bool has_lower_bound(lp::var_index var, u_dependency*& ci, lp::mpq& value, bool& is_strict) const {
return lra.has_lower_bound(var, ci, value, is_strict);
}
bool has_upper_bound(lp::var_index var, lp::constraint_index& ci, lp::mpq& value, bool& is_strict) const {
return m_lar_solver.has_upper_bound(var, ci, value, is_strict);
bool has_upper_bound(lp::var_index var, u_dependency*& ci, lp::mpq& value, bool& is_strict) const {
return lra.has_upper_bound(var, ci, value, is_strict);
}
bool zero_is_an_inner_point_of_bounds(lpvar j) const;
bool var_is_int(lpvar j) const { return m_lar_solver.column_is_int(j); }
bool var_is_int(lpvar j) const { return lra.column_is_int(j); }
int rat_sign(const monic& m) const;
inline int rat_sign(lpvar j) const { return nla::rat_sign(val(j)); }
@ -338,7 +342,7 @@ public:
bool is_octagon_term(const lp::lar_term& t, bool & sign, lpvar& i, lpvar &j) const;
void add_equivalence_maybe(const lp::lar_term *t, lpci c0, lpci c1);
void add_equivalence_maybe(const lp::lar_term* t, u_dependency* c0, u_dependency* c1);
void init_vars_equivalence();