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optimizations to bv-solver and euf-egraph (#4698)

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* additional bit-vector propagators

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

* rename restrict (not a keyword, but well) #4694, tune euf

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

* merge

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

* add pb rewriting to pb2bv #4697

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-09-20 06:47:27 -07:00 • committed by GitHub
parent ed44a44579
commit 6f63f8761c
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GPG key ID: 4AEE18F83AFDEB23
24 changed files with 206 additions and 116 deletions
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26
src/sat/smt/euf_internalize.cpp
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@ -82,10 +82,11 @@ namespace euf {
void solver::attach_node(euf::enode* n) {
expr* e = n->get_expr();
sat::literal lit;
if (!m.is_bool(e))
drat_log_node(e);
else
attach_lit(literal(si.add_bool_var(e), false), e);
lit = attach_lit(literal(si.add_bool_var(e), false), e);
if (!m.is_bool(e) && m.get_sort(e)->get_family_id() != null_family_id) {
auto* e_ext = expr2solver(e);
@ -93,7 +94,7 @@ namespace euf {
if (s_ext && s_ext != e_ext)
s_ext->apply_sort_cnstr(n, m.get_sort(e));
}
expr* a = nullptr, * b = nullptr;
expr* a = nullptr, * b = nullptr;
if (m.is_eq(e, a, b) && m.get_sort(a)->get_family_id() != null_family_id) {
auto* s_ext = sort2solver(m.get_sort(a));
if (s_ext)
@ -121,10 +122,12 @@ namespace euf {
return lit;
m_var2expr[v] = e;
m_var_trail.push_back(v);
if (!m_egraph.find(e)) {
enode* n = m_egraph.mk(e, 0, nullptr);
enode* n = m_egraph.find(e);
if (!n)
n = m_egraph.mk(e, 0, nullptr);
m_egraph.set_bool_var(n, v);
if (!m.is_true(e) && !m.is_false(e))
m_egraph.set_merge_enabled(n, false);
}
return lit;
}
@ -262,6 +265,19 @@ namespace euf {
s().add_clause(2, lits1, st);
s().add_clause(2, lits2, st);
}
else if (m.is_eq(e, th, el) && !m.is_iff(e)) {
sat::literal lit1 = expr2literal(e);
s().set_phase(lit1);
expr_ref e2(m.mk_eq(el, th), m);
enode* n2 = m_egraph.find(e2);
if (n2) {
sat::literal lit2 = expr2literal(e2);
sat::literal lits1[2] = { ~lit1, lit2 };
sat::literal lits2[2] = { lit1, ~lit2 };
s().add_clause(2, lits1, st);
s().add_clause(2, lits2, st);
}
}
}