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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.
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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/smt_params_helper.pyg
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@ -107,6 +107,7 @@ def_module_params(module_name='smt',
('seq.split_w_len', BOOL, True, 'enable splitting guided by length constraints'),
('seq.validate', BOOL, False, 'enable self-validation of theory axioms created by seq theory'),
('seq.max_unfolding', UINT, 1000000000, 'maximal unfolding depth for checking string equations and regular expressions'),
('seq.min_unfolding', UINT, 1, 'initial bound for strings whose lengths are bounded by iterative deepening. Set this to a higher value if there are only models with larger string lengths'),
('str.strong_arrangements', BOOL, True, 'assert equivalences instead of implications when generating string arrangement axioms'),
('str.aggressive_length_testing', BOOL, False, 'prioritize testing concrete length values over generating more options'),
('str.aggressive_value_testing', BOOL, False, 'prioritize testing concrete string constant values over generating more options'),