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change projection function

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-12-28 09:38:17 +08:00
parent 8b3abe120c
commit 8829fa96de
2 changed files with 39 additions and 21 deletions
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10
src/qe/qe_mbi.cpp
View file

@ -325,20 +325,14 @@ namespace qe {
TRACE("qe", tout << "unsat core: " << lits << "\n";);
// optionally minimize core using superposition.
return mbi_unsat;
case l_true: {
case l_true:
m_solver->get_model(mdl);
if (!get_literals(mdl, lits)) {
return mbi_undef;
}
project0(mdl, lits);
project(mdl, lits);
return mbi_sat;
}
default:
// TBD: if not running solver to completion, then:
// 1. extract unit literals from m_solver.
// 2. run a cc over the units
// 3. extract equalities or other assignments over the congruence classes
// 4. ensure that at least some progress is made over original lits.
return mbi_undef;
}
}

50
src/qe/qe_term_graph.cpp
View file

@ -774,11 +774,13 @@ namespace qe {
TRACE("qe", tout << "literals: " << res << "\n";);
}
void mk_distinct(expr_ref_vector& res) {
vector<ptr_vector<term>> decl2terms; // terms that use function f
ptr_vector<func_decl> decls;
decl2terms.reset();
vector<ptr_vector<term>> m_decl2terms; // terms that use function f
ptr_vector<func_decl> m_decls;
void collect_decl2terms() {
// Collect the projected function symbols.
m_decl2terms.reset();
m_decls.reset();
for (term *t : m_tg.m_terms) {
expr* e = t->get_expr();
if (!is_app(e)) continue;
@ -787,28 +789,45 @@ namespace qe {
func_decl* d = a->get_decl();
if (d->get_arity() == 0) continue;
unsigned id = d->get_decl_id();
decl2terms.reserve(id+1);
if (decl2terms[id].empty()) decls.push_back(d);
decl2terms[id].push_back(t);
m_decl2terms.reserve(id+1);
if (m_decl2terms[id].empty()) m_decls.push_back(d);
m_decl2terms[id].push_back(t);
}
}
void args_are_distinct(expr_ref_vector& res) {
//
// for each projected function that occurs
// (may occur) in multiple congruence classes,
// produce assertions that non-congruent arguments
// are forced distinct.
// are distinct.
//
for (func_decl* d : decls) {
for (func_decl* d : m_decls) {
unsigned id = d->get_decl_id();
ptr_vector<term> const& terms = decl2terms[id];
ptr_vector<term> const& terms = m_decl2terms[id];
if (terms.size() <= 1) continue;
unsigned arity = d->get_arity();
for (unsigned i = 0; i < arity; ++i) {
obj_hashtable<expr> roots;
obj_hashtable<expr> roots, root_vals;
expr_ref_vector pinned(m);
for (term* t : terms) {
expr* arg = to_app(t->get_expr())->get_arg(i);
term const& root = m_tg.get_term(arg)->get_root();
roots.insert(root.get_expr());
expr* r = root.get_expr();
// if a model is given, then use the equivalence class induced
// by the model. Otherwise, use the congruence class.
if (m_model) {
expr_ref tmp(m);
tmp = (*m_model)(r);
if (!root_vals.contains(tmp)) {
root_vals.insert(tmp);
roots.insert(r);
pinned.push_back(tmp);
}
}
else {
roots.insert(r);
}
}
if (roots.size() > 1) {
ptr_buffer<expr> args;
@ -820,6 +839,11 @@ namespace qe {
}
}
}
}
void mk_distinct(expr_ref_vector& res) {
collect_decl2terms();
args_are_distinct(res);
TRACE("qe", tout << res << "\n";);
}