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working on #5614

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there are some different sources for the performance regression illustrated by the example. The mitigations will be enabled separately:
- m_bv_to_propagate is too expensive
- lp_bound_propagator misses equalities in two different ways:
   - it resets row checks after backtracking even though they could still propagate
   - it misses equalities for fixed rows when the fixed constant value does not correspond to a fixed variable.

FYI @levnach
This commit is contained in:
Nikolaj Bjorner 2021-11-02 14:55:28 -07:00
parent a94e2e62af
commit 87d4ce2659
13 changed files with 422 additions and 385 deletions
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30
src/smt/smt_context_pp.cpp
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@ -262,22 +262,30 @@ namespace smt {
}
void context::display_eqc(std::ostream & out) const {
bool first = true;
for (enode * x : m_enodes) {
expr * n = x->get_expr();
expr * r = x->get_root()->get_expr();
if (n != r) {
if (first) {
out << "equivalence classes:\n";
first = false;
}
out << "#" << n->get_id() << " -> #" << r->get_id() << ": ";
out << mk_pp(n, m) << " -> " << mk_pp(r, m) << "\n";
if (m_enodes.empty())
return;
unsigned count = 0;
for (enode * r : m_enodes)
if (r->is_root())
++count;
out << "equivalence classes: " << count << "\n";
for (enode * r : m_enodes) {
if (!r->is_root())
continue;
out << "#" << enode_pp(r, *this) << "\n";
if (r->get_class_size() == 1)
continue;
for (enode* n : *r) {
if (n != r)
out << " #" << enode_pp(n, *this) << "\n";
}
}
}
void context::display_app_enode_map(std::ostream & out) const {
return;
// mainly useless
if (!m_e_internalized_stack.empty()) {
out << "expression -> enode:\n";
unsigned sz = m_e_internalized_stack.size();