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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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4
src/tactic/fd_solver/smtfd_solver.cpp
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@ -2086,6 +2086,10 @@ namespace smtfd {
expr_ref_vector cube(expr_ref_vector& vars, unsigned backtrack_level) override {
return expr_ref_vector(m);
}
expr* congruence_root(expr* e) override { return e; }
expr* congruence_next(expr* e) override { return e; }
lbool get_consequences_core(expr_ref_vector const& asms, expr_ref_vector const& vars, expr_ref_vector& consequences) override {
return l_undef;