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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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40
src/sat/smt/euf_solver.cpp
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@ -45,12 +45,7 @@ namespace euf {
[&](std::ostream& out, void* j) {
display_justification_ptr(out, reinterpret_cast<size_t*>(j));
};
std::function<lbool(enode* n)> eval = [&](enode* n) {
sat::literal lit = expr2literal(n->get_expr());
return (lit == sat::null_literal) ? l_undef : s().value(lit);
};
m_egraph.set_display_justification(disp);
m_egraph.set_eval(eval);
}
void solver::updt_params(params_ref const& p) {
@ -197,7 +192,7 @@ namespace euf {
e = m_var2expr[l.var()];
n = m_egraph.find(e);
SASSERT(n);
SASSERT(m_egraph.is_equality(n));
SASSERT(n->is_equality());
SASSERT(!l.sign());
m_egraph.explain_eq<size_t>(m_explain, n->get_arg(0), n->get_arg(1));
break;
@ -219,28 +214,32 @@ namespace euf {
if (!e)
return;
bool sign = l.sign();
TRACE("euf", tout << "asserted: " << mk_bounded_pp(e, m) << " := " << l << "@" << s().scope_lvl() << "\n";);
euf::enode* n = m_egraph.find(e);
TRACE("euf", tout << "asserted: " << l << "@" << s().scope_lvl() << "\n";);
if (!n)
return;
for (auto th : enode_th_vars(n))
bool sign = l.sign();
m_egraph.set_value(n, sign ? l_false : l_true);
auto const & j = s().get_justification(l);
for (auto th : enode_th_vars(n))
m_id2solver[th.get_id()]->asserted(l);
if (!n->merge_enabled())
return;
size_t* c = to_ptr(l);
SASSERT(is_literal(c));
SASSERT(l == get_literal(c));
if (m.is_eq(e) && n->num_args() == 2 && !sign) {
SASSERT(!m.is_iff(e));
euf::enode* na = n->get_arg(0);
euf::enode* nb = n->get_arg(1);
m_egraph.merge(na, nb, c);
}
else {
else if (n->merge_enabled()) {
euf::enode* nb = sign ? mk_false() : mk_true();
m_egraph.merge(n, nb, c);
}
else if (m.is_eq(e) && n->num_args() == 2 && sign) {
m_egraph.new_diseq(n);
}
}
@ -278,7 +277,7 @@ namespace euf {
bool is_eq = p.second;
expr* e = n->get_expr();
expr* a = nullptr, *b = nullptr;
bool_var v = si.to_bool_var(e);
bool_var v = n->bool_var();
SASSERT(m.is_bool(e));
size_t cnstr;
literal lit;
@ -288,10 +287,12 @@ namespace euf {
lit = literal(v, false);
}
else {
a = e, b = n->get_root()->get_expr();
SASSERT(m.is_true(b) || m.is_false(b));
lbool val = n->get_root()->value();
a = e;
b = (val == l_true) ? m.mk_true() : m.mk_false();
SASSERT(val != l_undef);
cnstr = lit_constraint().to_index();
lit = literal(v, m.is_false(b));
lit = literal(v, val == l_false);
}
unsigned lvl = s().scope_lvl();
@ -457,10 +458,7 @@ namespace euf {
auto* ext = bool_var2solver(v);
if (ext)
return ext->get_phase(v);
expr* e = bool_var2expr(v);
if (e && m.is_eq(e))
return l_true;
return l_undef;
return l_undef;
}
bool solver::set_root(literal l, literal r) {