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experimental feature to access congruence closure of SimpleSolver

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This update includes an experimental feature to access a congruence closure data-structure after search.
It comes with several caveats as pre-processing is free to eliminate terms. It is therefore necessary to use a solver that does not eliminate the terms you want to track for congruence of. This is partially addressed by using SimpleSolver or incremental mode solving.

```python
from z3 import *
s = SimpleSolver()
x, y, z = Ints('x y z')
s.add(x == y)
s.add(y == z)
s.check()
print(s.root(x), s.root(y), s.root(z))
print(s.next(x), s.next(y), s.next(z))
```
This commit is contained in:
Nikolaj Bjorner 2022-12-30 21:41:27 -08:00
parent c0f1f33898
commit f6d411d54b
21 changed files with 145 additions and 12 deletions
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2
src/opt/opt_solver.h
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@ -110,6 +110,8 @@ namespace opt {
void get_levels(ptr_vector<expr> const& vars, unsigned_vector& depth) override;
expr_ref_vector get_trail(unsigned max_level) override { return m_context.get_trail(max_level); }
expr_ref_vector cube(expr_ref_vector&, unsigned) override { return expr_ref_vector(m); }
expr* congruence_root(expr* e) override { return e; }
expr* congruence_next(expr* e) override { return e; }
void set_phase(expr* e) override { m_context.set_phase(e); }
phase* get_phase() override { return m_context.get_phase(); }
void set_phase(phase* p) override { m_context.set_phase(p); }