10 commits

Author	SHA1	Message	Date
Guangyu (Gary) HU	704dc9375d	mini_ic3: fix generalize() returning empty/init-overlapping core (#9245) ... Two fixes in examples/python/mini_ic3.py: 1. generalize(): the polarity of the disjointness check was inverted, and there was no guard against an empty unsat core. With an empty core, And([])=True so check_disjoint(init, prev(True)) is always False (init is sat), and the code returned the empty core. That empty core then became cube2clause([])=Or([])=False, which got added as a lemma to all frames. The frame became inconsistent and is_valid() returned And(Or())=False as the "inductive invariant". Fix: require len(core) > 0 AND check_disjoint(init, prev(core)) (without the spurious 'not'), so the core is only used when it is genuinely disjoint from init. 2. is_transition(): when an init rule's body happens to be an And without any Invariant predicate (e.g. (and (not A) (not B) ...)), is_body() returns (And(...), None). is_transition then passed inv0=None to subst_vars() which crashed inside get_vars(). Add an explicit None check so the rule falls through to is_init(). Verified on horn1..5 (unchanged behavior), h_CRC and h_FIFO from the blocksys benchmarks (now correctly return CEX matching z3 spacer), and cache_coherence_three (no longer collapses to (and or)).	2026-04-09 02:01:07 -07:00
Nikolaj Bjorner	53f72d9cbe	updated mini ... Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>	2022-01-26 15:44:49 -08:00
Huanyi Chen	19471f9fa3	Implement mini_quip	2019-01-04 18:30:02 -05:00
Huanyi Chen	83e3a79bd1	Remove testcase that takes long time to finish	2019-01-04 17:31:47 -05:00
Huanyi Chen	4b29b208ad	Add few more testcases	2018-12-28 13:28:15 -05:00
Huanyi Chen	300e99b67a	Make sure init is included when generalize	2018-12-28 13:21:40 -05:00
Huanyi Chen	b083c7546e	Substitue Vars in queries ... Replace Vars that are representing primary inputs as "i#" when query solvers.	2018-12-28 13:21:35 -05:00
Nikolaj Bjorner	2b35f1a924	quip ... Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>	2018-09-16 13:14:41 -07:00
Nikolaj Bjorner	98dfd82765	adding quipie ... Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>	2018-09-15 21:55:49 -07:00
Nikolaj Bjorner	0232383191	mini IC3 sample ... Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>	2018-09-15 16:59:06 -07:00