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fix #6343

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The bug was that axiom generation was not enabled on last_index, so no axioms got created to constrain last-index.
With default settings the solver is now very slow on this example. It is related to that the smallest size of a satisfying assignment is above 24. Pending a good heuristic to find initial seeds and increments for iterative deepening, I am adding another parameter smt.seq.min_unfolding that when set to 30 helps for this example.
This commit is contained in:
Nikolaj Bjorner 2022-09-14 10:17:00 -07:00
parent 16ef89905d
commit c47ca341b7
5 changed files with 7 additions and 0 deletions
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src/smt/params/theory_seq_params.h
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@ -25,6 +25,7 @@ struct theory_seq_params {
bool m_split_w_len = false;
bool m_seq_validate = false;
unsigned m_seq_max_unfolding = UINT_MAX/4;
unsigned m_seq_min_unfolding = 1;
theory_seq_params(params_ref const & p = params_ref()) {
updt_params(p);