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Author SHA1 Message Date
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
Copilot
8d7ed66ebf
Fix Specbot Crash Analyzer: move Z3 build to pre-steps to avoid MCP session timeout (#9200) 
* Initial plan

* Fix specbot-crash-analyzer: move build to pre-steps to avoid MCP session timeout

Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/add5e714-bc98-44cf-ad6b-5adfbe4668c3

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 08:48:25 -07:00
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
Copilot
eef00e2023
Add specbot-crash-analyzer agentic workflow (.md + .lock.yml) (#9198) 
Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/efdf69c9-8aca-4acc-b780-f3a7769ba116

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 01:10:56 -07:00
Nikolaj Bjorner
4c463ad813 add report 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-02 00:48:27 -07:00
Nikolaj Bjorner
251127e45f add specbot tests 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-02 00:44:47 -07:00
Nikolaj Bjorner
2245451e96 remove aux function 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 19:07:37 -07:00
Nikolaj Bjorner
6e8c201234 fix test 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 16:00:01 -07:00
Nikolaj Bjorner
d05dccf331 add current_value access 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 13:30:15 -07:00
Nikolaj Bjorner
b1dc2f2be2 It is possible that a non-internalized expression gets assigned to false immediately by internalization 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 11:49:25 -07:00
CEisenhofer
42f421ee09 Detect that adding side constraint caused a conflict 2026-04-01 20:38:15 +02:00
Nikolaj Bjorner
4524ebe614 fix type error 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 10:35:10 -07:00
CEisenhofer
f709f6d089 Don't add constraint twice 2026-04-01 18:56:45 +02:00
CEisenhofer
261385f702 Merge remote-tracking branch 'origin/c3' into c3 2026-04-01 18:51:36 +02:00
Nikolaj Bjorner
9a29a0fc24 hoist functionality 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 09:41:49 -07:00
Nikolaj Bjorner
3879e2190a recompile workflows 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 09:27:45 -07:00
Copilot
cf051598f9
Update RELEASE_NOTES.md with Version 4.17.0 additions from discussion #9172 (#9186) 
Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/488739ce-e615-410e-8956-677db4c0df2a

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
 2026-04-01 08:54:45 -07:00
Nikolaj Bjorner
5f5a0ffbd8 na 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 08:47:56 -07:00
Nikolaj Bjorner
f5382144e6 use mod counts 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 08:41:49 -07:00
Nikolaj Bjorner
3ad6df3258 build fixes 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 08:29:41 -07:00
CEisenhofer
beda426d7c Integer conflicts are proper conflicts 2026-04-01 17:21:11 +02:00
CEisenhofer
36b01a51f1 Properly extract justifications from subsolver 2026-04-01 16:58:26 +02:00
Copilot
7f9494329f
Refactor: Add arith_util a member to nielsen_graph, eliminate repeated local instantiations (#9185) 
* add arith_util a attribute to nielsen_graph, replace local arith_util instances

Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/8d6c7e3f-5853-4c64-a448-34a10fb64f3b

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

* remove arith aliases, reference a directly in nielsen_graph methods

Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/a6a64bf1-86fc-41bc-a245-2f67656d5f63

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>
Co-authored-by: Nikolaj Bjorner <nbjorner@microsoft.com>
 2026-04-01 07:18:23 -07:00