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22813 commits 76 branches 58 tags 268 MiB
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18515 commits

Author SHA1 Message Date
Nikolaj Bjorner
3c7e5c8197 add fold-unfold simplifier 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-10 18:04:09 -07:00
Nikolaj Bjorner
e0401a6544 fix truncation error 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-10 18:04:08 -07:00
Arie
58ad1f0918
Fix scaled_min test failure from #9235 mod-factor-propagation (#9260) 
The is_mod handler in theory_lra called ensure_nla(), which
unnecessarily created the NLA solver for pure linear problems, causing
the optimizer to return a finite value instead of -infinity.

Fix: check `m_nla` instead of calling `ensure_nla()`, matching the
pattern used by the is_idiv handler. The mod division is only registered
when NLA is already active due to nonlinear terms.

Update mod_factor tests to use QF_NIA logic and assert the mul term
before the mod term so that internalize_mul triggers ensure_nla() before
mod internalization.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-04-10 12:52:42 -07:00
CEisenhofer
e584895c98 Make model extraction a bit more stable 2026-04-10 18:15:06 +02:00
CEisenhofer
2b7204b07c Does model construction work properly now? 2026-04-10 17:59:16 +02:00
Nikolaj Bjorner
23ae00a57e update count to 2 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-09 16:39:51 -07:00
Ilana Shapiro
ceb363d35d
SMTS tree algorithms (#9250) 
* Refactor parallel search tree to use global node selection (SMTS-style) instead of DFS traversal.
Introduce effort-based prioritization, allow activation of any open node, and add controlled/gated
expansion to prevent over-partitioning and improve load balancing.

* clean up code

* ablations

* ablations2: effort

* ablations2: activation

* ablations3: more activations

* ablations4: visit all nodes before splitting

* throttle tree size min is based on workers not activated nodes

* ablate random throttling

* ablate nonlinear effort

* clean up code

* ablate throttle

* ablate where add_effort is

* reset

* clean up a function and add comment

---------

Co-authored-by: Ilana Shapiro <ilanashapiro@Ilanas-MBP.localdomain>
Co-authored-by: Ilana Shapiro <ilanashapiro@Ilanas-MacBook-Pro.local>
Co-authored-by: Ilana Shapiro <ilanashapiro@Ilanas-MBP.lan1>
 2026-04-09 09:46:47 -07:00
Nikolaj Bjorner
c7879ed5ad fix #9254 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-09 09:19:40 -07:00
CEisenhofer
e6ef0d29c4 We need to check local consistency over and over again 2026-04-09 15:56:00 +02:00
CEisenhofer
09572b20ed Character ranges must be passed back to the solver 2026-04-09 15:21:12 +02:00
CEisenhofer
aafb704cf8 Bug fix in model extraction 2026-04-09 14:42:48 +02:00
CEisenhofer
d127055841 fix(nseq): handle empty children in apply_regex_factorization 2026-04-09 14:24:44 +02:00
CEisenhofer
a36254f104 Some more bug fixes 2026-04-09 13:47:29 +02:00
CEisenhofer
38d725dc5a Deriving by allchar should not crash 2026-04-09 11:48:35 +02:00
CEisenhofer
8eb0ac29d9 We have to check for local conflicts before clearing the flag 2026-04-09 11:42:30 +02:00
Nikolaj Bjorner
bb48e3a405 disable spurious test 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-09 02:20:45 -07:00
CEisenhofer
598e4ede4e Removed debug code 2026-04-09 11:03:18 +02:00
CEisenhofer
803018b7c3 We forgot relevant equations with one side being empty 2026-04-09 10:40:33 +02:00
CEisenhofer
684f93bed4 We should not stop eagerly on local conflicts 2026-04-08 20:13:54 +02:00
CEisenhofer
857e93fdb2 Substitutions are extensions 2026-04-08 19:13:10 +02:00
CEisenhofer
513f49f39c Debugging 2026-04-08 18:48:47 +02:00
CEisenhofer
86dc9d3268 We need to reset local conflicts 2026-04-08 18:24:11 +02:00
CEisenhofer
26ededa891 More debug info 2026-04-08 18:00:52 +02:00
CEisenhofer
74cf21b852 Bug in model extraction 
Added debug check
 2026-04-08 16:37:21 +02:00
CEisenhofer
26d36ba6ee Missing justification added 
Added check for correctness of conflict core
 2026-04-08 10:15:27 +02:00
CEisenhofer
c7e7b40d40 Fix 2026-04-08 09:27:46 +02:00
CEisenhofer
f895548154 Check for range conflicts for characters 2026-04-07 10:49:23 +02:00
CEisenhofer
1a1961be2f Removed tracking disequality 2026-04-07 10:33:44 +02:00
CEisenhofer
3e24cb7c10 Bug 2026-04-07 09:33:14 +02:00
Arie
477a1d817d
Add mod-factor-propagation lemma to NLA divisions solver (#9235) 
When a monic x*y has a factor x with mod(x, p) = 0 (fixed), propagate
mod(x*y, p) = 0. This enables Z3 to prove divisibility properties like
x mod p = 0 => (x*y) mod p = 0, which previously timed out even for
p = 2. The lemma fires in the NLA divisions check and allows Gröbner
basis and LIA to subsequently derive distributivity of div over addition.

Extends division tuples from (q, x, y) to (q, x, y, r) to track the
mod lpvar. Also registers bounded divisions from the mod internalization
path in theory_lra, not just the idiv path.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-04-05 17:34:11 -07:00
CEisenhofer
2a32aa0204 fix(nseq): assert sub-sequence equalities to the SAT core 2026-04-04 19:11:36 +02:00
CEisenhofer
8298ba6011 Quick fix for some unsound cases 2026-04-04 18:36:25 +02:00
CEisenhofer
a58a9114d2 Fix str.< Skolem length generation overhead 2026-04-04 18:32:02 +02:00
Nikolaj Bjorner
b60a44c66b classical 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-03 10:33:28 -07:00
Nikolaj Bjorner
cdccd389e9 revert s_unknown 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-03 10:04:13 -07:00
Nikolaj Bjorner
95dc44b409 bugfix, better debug display of failure 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-03 09:08:22 -07:00
Copilot
fa89910452
Add SASSERT invariants and pre/postconditions to Nielsen seq solver (#9216) 
* Initial plan

* Add SASSERT invariants and pre/postconditions to Nielsen seq solver

Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/24442582-8437-45ae-a58f-957ac2bdf698

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Add clarifying comment to m_str_eq.empty() postcondition

Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/24442582-8437-45ae-a58f-957ac2bdf698

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
 2026-04-02 21:09:23 -07:00
Copilot
bbb704e63c
seq_axioms: eliminate redundant mk_literal call in add_clause (#9215) 
* Initial plan

* fix: use already-computed literal in seq_axioms::add_clause

Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/0ab6afce-13a9-4e77-87b4-e416bc06f413

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
 2026-04-02 21:08:16 -07:00
Copilot
ddd8bf84d7
Replace apply_regex_unit_split with apply_regex_if_split (#9210) 
Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/7df36402-f2c7-4de5-b626-3df14d4eee64

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
 2026-04-02 14:27:06 -07:00
Nikolaj Bjorner
e59ee306e9 allow literals to be false in model validation - we can't enforce lack of propagation after internalizing literals, especially if literals are repeated (modulo permutation of equality) 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-02 12:51:47 -07:00
Nikolaj Bjorner
3629cd9447 regression fixes 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-02 11:42:50 -07:00
CEisenhofer
9b3826ed86 Missing case in concatenation 2026-04-02 20:08:00 +02:00
CEisenhofer
a81ce477f5 Added classical regex factorization 2026-04-02 20:08:00 +02:00
Nikolaj Bjorner
3ca960d679 test that there is a model 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-02 10:49:09 -07:00
Nikolaj Bjorner
b0a4a15c98 updated tests 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-02 10:04:02 -07:00
CEisenhofer
34cb0a17fc str.at wants a special treatment... 2026-04-02 18:33:44 +02:00
CEisenhofer
a8db876765 Fix problem with divisibility predicate 2026-04-02 16:25:49 +02:00
CEisenhofer
5ec28d3bc8 Eliminate length gradients from regexes 2026-04-02 15:58:15 +02:00
CEisenhofer
1282e4de11 Prevent unsoudness because of missing length propagation 2026-04-02 14:34:46 +02:00
CEisenhofer
1e567a4a26 Bug fixes 2026-04-02 10:26:36 +02:00