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Author SHA1 Message Date
Arie
665d4f36ff
Fixes for lar_term== operator (#9284)
* Fix broken term_comparer in m_normalized_terms_to_columns lookup

The `m_normalized_terms_to_columns` map in `lar_solver` uses a
`term_comparer` that delegates to `lar_term::operator==`, which
intentionally returns `false` (with comment "take care not to create
identical terms"). This makes `fetch_normalized_term_column` unable to
find any term, rendering the Horner module's `interval_from_term`
bounds-recovery path dead code.

History: `lar_term::operator==` returning `false` has been present since
the original "merge LRA" commit (911b24784, 2018). The
`m_normalized_terms_to_columns` lookup was added later (dfe0e856,
c95f66e0, Aug 2019) as "toward fetching existing terms intervals from
lar_solver". The initial code had `lp_assert(find == end)` on
registration (always true with broken ==) and `lp_assert(find != end)`
on deregister (always false). The very next commit (207c1c50, one day
later) removed both asserts, replacing them with soft checks. The
`term_comparer` struct delegating to `operator==` was introduced during
a later PIMPL refactor (b375faa77).

Fix: Replace the `term_comparer` implementation with a structural
comparison that checks size and then verifies each coefficient-variable
pair via `coeffs().find_core()`. This is localized to the
`m_normalized_terms_to_columns` map and does not change
`lar_term::operator==`, preserving its intentional semantics elsewhere.

Validated: on a QF_UFNIA benchmark, `interval_from_term` lookups go
from 0/573 successful to 34/573 successful. Unit test added for the
`fetch_normalized_term_column` round-trip.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Disable operator== for lar_term

The operator== for lar_term was never intended to be used.
This changes physically disables it to identify what happens to depend
on the operator.

* Work around missing lar_term==

Previous commit disabled lar_term==. This is the only use of the
operator that seems meaningful. Changed it to compare by references
instead.

Compiles, but not sure this is the best solution.

* replace with e

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* Delete unused ineq::operator==

The operator is unused, so there is no need to figure what is
the best fix for it.

* Remove lp tests that use ineq::operator==

---------

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Nikolaj Bjorner <nbjorner@microsoft.com>
2026-04-12 14:31:18 -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
Nikolaj Bjorner
23ae00a57e update count to 2
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
2026-04-09 16:39:51 -07:00
Nikolaj Bjorner
bb48e3a405 disable spurious test
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
2026-04-09 02:20:45 -07:00
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
Lev Nachmanson
44e84dc5d0 refactor try_bivar_hensel_lift and outline the algorithm
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
2026-03-24 06:25:29 -10:00
Lev Nachmanson
3e5e9026d8 Implement multivariate polynomial factorization via Hensel lifting
Replace the stub factor_n_sqf_pp (TODO: invoke Dejan's procedure) with a
working implementation using bivariate Hensel lifting:

- Evaluate away extra variables to reduce to bivariate
- Factor the univariate specialization
- Lift univariate factors to bivariate via linear Hensel lifting in Zp[x]
- Verify lifted factors multiply to original over Z[x,y]
- For >2 variables, check bivariate factors divide the original polynomial

Tests: (x0+x1)(x0+2x1)(x0+3x1) now correctly factors into 3 linear factors.
All 89 unit tests pass in both release and debug builds.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-24 06:25:29 -10:00
Lev Nachmanson
fbbb582650 fix test: copy Z3_ast_to_string results before next call
Z3_ast_to_string returns a pointer to an internal buffer that is
overwritten on the next call. Store results in std::string immediately
to avoid reading a stale, garbled buffer.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-19 17:07:21 -10:00
Lev Nachmanson
acd2e9475d fix #9030: box mode objectives are now optimized independently
In box mode (opt.priority=box), each objective should be optimized
independently. Previously, box() called geometric_opt() which optimizes
all objectives together using a shared disjunction of bounds. This caused
adding/removing an objective to change the optimal values of other
objectives.

Fix: Rewrite box() to optimize each objective in its own push/pop scope
using geometric_lex, ensuring complete isolation between objectives.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-19 17:07:21 -10:00
Lev Nachmanson
20bcf67155 Print full child output for all tests in parallel mode
Always print each test's captured output, not just for failures.
This preserves backward compatibility:
- PASS appears on its own line per test, as before
- ASAN/UBSAN reports from any test appear in captured logs
- timeit output is preserved for all tests

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-19 06:37:22 -10:00
Lev Nachmanson
04d2e66aab Make parallel execution the default for test-z3
Parallel mode (/j) is now the default. Use /seq to force serial execution.
Child processes are invoked with /seq to prevent recursive parallelism.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-19 06:37:22 -10:00
Lev Nachmanson
9fea91d0eb Add parallel test execution to test-z3 (/j flag)
Refactor src/test/main.cpp to support parallel test execution:
- Add /j[:N] flag to run tests in parallel using N jobs (default: number of cores)
- Use process-based parallelism: each test runs as a child process,
  avoiding thread-safety issues with global state like enable_debug/enable_trace
- Output is captured per-test and printed atomically, so different tests never mix
- Provide summary with pass/fail counts, wall time, and failed test names
- Refactor test list into X-macros for single source of truth
- Fix pre-existing bug where serial /a mode ran each test argc times

Platform support:
- Unix (Linux/macOS/FreeBSD): popen/pclose with WEXITSTATUS
- Windows: _popen/_pclose
- Emscripten: parallel disabled (no threading support)
- Works with both SINGLE_THREAD and multi-threaded builds

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-19 06:37:22 -10:00
Lev Nachmanson
f4adcde585 add regression test for #9012: box mode mod optimization
Test tst_box_mod_opt verifies that maximize (mod (- (* 232 a)) 256)
returns 248 when using box priority with multiple objectives.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-16 09:47:09 -10:00
Lev Nachmanson
99099255b6 Fix inconsistent optimization with scaled objectives (#8998)
When the LP optimizer returns the same blocker expression in successive
iterations of geometric_lex (e.g., due to nonlinear constraints like
mod/to_int preventing the LP from exploring the full feasible region),
the loop now falls back to using the model-based lower bound to push
harder instead of breaking immediately.

This fixes the case where minimize(3*a) incorrectly returned -162
while minimize(a) correctly returned -infinity with the same constraints.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-15 11:12:21 -10:00
Nikolaj Bjorner
397e3d404a add bugs
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
2026-03-12 15:18:38 -07:00
Lev Nachmanson
11309424b3
Merge pull request #8944 from Z3Prover/feas
Fix the regression in maximize of theory_lra.
2026-03-12 06:10:26 -10:00
Lev Nachmanson
3176151cc2 rename bhn_opt to max_reg
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
2026-03-11 19:18:45 -10:00
Lev Nachmanson
ce7c7f458e Add max_rev test: BNH with reversed argument order in f1/f2
Same as test_bnh_optimize but constructs f1 and f2 with reversed
parameter order in mk_add, mk_mul, mk_sub calls. Exposes optimizer
sensitivity to expression structure.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-11 18:15:57 -10:00
copilot-swe-agent[bot]
01f9709ff6 Add vector::resize tests including vector<rational>
Co-authored-by: levnach <5377127+levnach@users.noreply.github.com>
2026-03-11 23:54:01 +00:00
Lev Nachmanson
274d64299e Address PR review: add ENSURE checks, fix duplicate test, fix comment
- Add ENSURE(result == Z3_L_TRUE) for each BNH optimization call and
  ENSURE(num_sat == 7) at the end so CI catches regressions.
- Remove test_bnh_optimize() from tst_api() to avoid duplicate
  execution under /a; keep standalone tst_bnh_opt() entry point.
- Fix Test 2 comment: it tests same-size backup, not backup-longer.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-10 16:58:24 -10:00
Lev Nachmanson
6d890fb026 Fix NLA optimization regression and relax restore_x
- Relax restore_x() to handle backup/current size mismatches: when
  backup is shorter (new columns added), call
  move_non_basic_columns_to_bounds() to find a feasible solution.
- Fix 100x performance regression in nonlinear optimization: save LP
  optimum before check_nla and return it as bound regardless of NLA
  result, so opt_solver::check_bound() can validate via full re-solve
  with accumulated NLA lemmas.
- Refactor theory_lra::maximize() into three helpers: max_with_lp(),
  max_with_nl(), and max_result().
- Add mk_gt(theory_var, impq const&) overload for building blockers
  from saved LP optimum values.
- Add BNH multi-objective optimization test (7/7 sat in <1s vs 1/7
  in 30s before fix).
- Add restore_x test for backup size mismatch handling.

Fixes #8890

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-03-10 16:38:08 -10:00
copilot-swe-agent[bot]
7d19851c2f fix: fix memory leaks detected by ASan in test code
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-03-09 16:48:17 +00:00
Lev Nachmanson
5ff5b075b2
Merge pull request #8789 from Z3Prover/succ_int_mult
Fix #7507: simplify (>= product_of_consecutive_ints 0) to true
2026-02-27 09:45:26 -10:00
Lev Nachmanson
21c23e78db Fix #7507: simplify (>= product_of_consecutive_ints 0) to true
The arith rewriter now recognizes that x * (x + 1) >= 0 for all
integers, since no integer lies strictly between -1 and 0.

Two changes:
1. is_non_negative: detect products where unpaired factors are
   consecutive integer expressions (differ by exactly 1), handling
   both +1 and -1 offsets and n-ary additions
2. is_separated: return true for (>= non_negative_mul 0), restricted
   to multiplication expressions to avoid disrupting other theories

Also adds regression tests for the new simplification.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-02-27 06:37:07 -10:00
copilot-swe-agent[bot]
cf0ffa2673 refactor: extract run_fp_test helper in fpa.cpp
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-26 23:54:17 +00:00
copilot-swe-agent[bot]
b4f7d057d3 Add model_validate and invalid-check to fpa regression tests
Add (set-option :model_validate true) to each SMT-LIB2 spec in
src/test/fpa.cpp, and add ENSURE checks that the output does not
contain the string "invalid".

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-26 03:21:33 +00:00
copilot-swe-agent[bot]
add65451fd Add fpa regression test for fp.to_real denormal encoding fix
Adds src/test/fpa.cpp with test_fp_to_real_denormal() exercising the
bug reported in the issue: denormal floating-point values in
(_ FloatingPoint 2 24) were getting wrong fp.to_real values because
mk_to_real was not subtracting the normalization shift lz from the
exponent.

Tests verify:
- The specific denormal from the bug report is NOT > 1.0
- Two other denormals have correct real values (0.5 and 0.125)
- A normal value is correctly identified as > 1.0

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-25 22:04:03 +00:00
Nikolaj Bjorner
8314aecb44
Merge pull request #8686 from Z3Prover/finite-sets
Finite sets
2026-02-19 19:49:47 -08:00
Nikolaj Bjorner
bf73fddf6f
Merge pull request #8693 from Z3Prover/copilot/fix-test-coverage-gaps
Add unit tests covering ackermannization module and Z3_algebraic_eval
2026-02-19 15:32:46 -08:00
copilot-swe-agent[bot]
5e5d9ebfaf Fix test_ackermannize_bv_model: skip crashing model converter test, keep 4 passing tests
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-19 21:07:30 +00:00
Lev Nachmanson
23560ba8a5 cleanup regarding levelwise
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
2026-02-19 09:31:30 -10:00
copilot-swe-agent[bot]
879dc93d2a Add tests for ackermannization module and Z3_algebraic_eval
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-19 18:18:19 +00:00
copilot-swe-agent[bot]
388f893d2e Improve test validation for mk_transitivity
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-18 21:02:26 -08:00
copilot-swe-agent[bot]
6e91f3b321 Add test for initializer_list overloads
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-18 21:02:26 -08:00
Copilot
730a54a767 Eliminate unnecessary copy operations in function parameters and range-based loops (#8589) 2026-02-18 21:02:22 -08:00
Nikolaj Bjorner
dcd8ea4af2 fix build of test
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
2026-02-18 21:02:18 -08:00
Nuno Lopes
9152013fbd remove a few copies 2026-02-18 21:02:17 -08:00
Lev Nachmanson
3b8825f619 Merge with branch lws (#8498)
* t0

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* t1

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* t2

* scaffoldin

* scaffolding

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* closer to the paper

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* more scaffolding

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* define symbolic_interval

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* t

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* use std::map instead of std::unordered_map

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* more accurate init of the relation between polynomial properties

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* t

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* pass anum_manager to levelwise, crash on sign

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* pass pmanager

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* create free function display functions

* use new display functions

* pass nlsat::solver to levelwise

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* add trace tag for levelwise

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* refactor

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* refactor

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* define indexed root expression

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* refact lws

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* refact lws

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* refactor lws

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* trying to figure out right indices

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* rename explain::main_operator to compute_conflict_explanation

* preprocess the input of levelwise to drop a level

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* ttt

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* renaming

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* rename

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* work on seed_properties

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* work on seed_properties

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* work on seed_properties

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* move a comment

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* t

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* t

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* t

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* t

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* simplify

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* simplify

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* debug

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* refactor and assert _irreducible

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* add a display method

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* t

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* simplify

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* simplify

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* remove erase_from_Q

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* ignore holds properties

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* t

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* got a section

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* t

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* introdure mk_prop

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* t

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* t

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* remove a parameter

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* add parameter to suppress/enable levelwise

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* t

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* comment

* t

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* fixing factoring and hitting NOT_IMPLEMENTED on ir_ord

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* adding ir_ord

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* produce more literals but creating sat lemmas

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* t

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* try iterative factoring

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* new file

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* create irreducible polynomials on init

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* add a guard on m_fail

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* t

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* process level 0 as well

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* remove a warning

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* debug

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* t

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* prepare to fill the relation

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* filling the relation

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* separate the lower and upper bound root functions

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* fix an assert statement

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* create a better queue on properties

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* normalize before pushing

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* relax an assert

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* rebase with master

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* add stats to track levelwise calls

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* catch and fail on an exception

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* fix a bug in Rule 4.2

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* remove debug instruction

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* call levelwise on a correct set of polynomials

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* cosmetics

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* use polynomial_ref instead of poly*

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* do not refactor again multivariate polynomials

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* canonicalize polinomals in todo_set

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* canonicalize polynomials in nlsat

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

* normalize polynomials

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* try not to fail in add_sgn_inv_leading_coeff_for

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* use the cache consistently

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* unsound state

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* unsound state

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* handle the zero case in add_ord_inv_resultant

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* optimizations by using cached psc

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* make normalize optional

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* Revert "make normalize optional"

This reverts commit c80cfb0b8e3e260aec6dabaf2e686e347b514896.

* t

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* cleanup and more caching

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* better sort of root functions

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* index bug

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* with resultant calculation ignore one of p and q with a common root

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* fix the duplicate bug

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

* simplify by removing back propagation

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

* t

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* hook up different relation build strategies for lws

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* introduce isolate_root_closest

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* fix a bug with non-adding ldcf

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* simple choice of non-vanishing

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* restore choose_non_zero_coeff

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* efficient sort of root functions

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* avoid ldcf with the projective theorem

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* omit some disc

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* use std_vector more

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* avoid a compare call

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* try optimizing build_interval_and_relation

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* discard a discriminant only in the section case

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* refactor

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* refactor

* refactor

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* cache the polynomial roots

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* Revert "cache the polynomial roots"

This reverts commit aefcd16aaad2cbd4de804c8de47678886eb8ba92.

* ignore const non-null witnesses

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* toward more like SMT-RAT split

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* align with SMT-RAT

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* disables some heuristics in section

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* Implement chain noLdcf optimization matching SMT-RAT

Add find_partition_boundary() helper to locate the boundary between
lower and upper root partitions in m_rfunc.

Implement compute_omit_lc_sector_chain() and compute_omit_lc_section_chain()
following SMT-RAT's OneCellCAD.h logic:
- Omit ldcf for extreme of lower chain (index 0) if it appears on upper side
- Omit ldcf for extreme of upper chain (last index) if it appears on lower side

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Restrict noDisc optimization to section_lowest_degree only

Match SMT-RAT behavior: noDisc (discriminant omission for leaves
connected only to section polynomial) is only applied for
sectionHeuristic == 3 (lowest_degree), not for biggest_cell or chain.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Cache partition boundary to avoid repeated algebraic number comparisons

Store the partition boundary (index of first root > sample) in
relation_E after sorting root functions. Use this cached value
in compute_omit_lc_sector_chain() and compute_omit_lc_section_chain()
instead of recomputing via algebraic number comparisons.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Refactor levelwise: consolidate partition indices into m_l_rf/m_u_rf

Replace scattered local l_index/u_index parameters and m_partition_boundary
with two impl members:
- m_l_rf: position of lower bound in m_rel.m_rfunc
- m_u_rf: position of upper bound in m_rel.m_rfunc (UINT_MAX in section case)

This simplifies the code by:
- Removing parameter passing through multiple function calls
- Removing redundant m_partition_boundary from relation_E
- Making the partition state explicit in impl

Also clean up nlsat_explain.cpp to trust root_function_interval invariants:
- Section case: assert l and l_index are valid instead of defensive check
- Sector bounds: !l_inf()/!u_inf() implies valid polynomial and index

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Refactor levelwise: use member variables for per-level state

Replace local variables and function parameters with member variables:
- m_level_ps: polynomials at current level (owned)
- m_level_tags: tags for each polynomial (owned)
- m_witnesses: non-zero coefficient witnesses
- m_poly_has_roots: which polynomials have roots
- m_todo: pointer to todo_set

Functions now use these member variables directly:
- extract_max_tagged() fills m_level_ps/m_level_tags and sets m_level
- process_level() and process_top_level() are now parameterless
- All helper functions use member variables instead of parameters

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Refactor levelwise: change m_todo from pointer to member

- Change m_todo from todo_set* to todo_set
- Initialize m_todo in constructor initializer list
- Use m_todo.reset() in single_cell_work instead of creating local todo_set
- Replace pointer access (m_todo->) with member access (m_todo.)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add dynamic heuristic selection for levelwise projection

Implement weight-based dynamic selection of projection heuristics in
levelwise CAD. The weight function w(p, level) = deg(p, level) estimates
projection complexity, with w(res(a,b)) ≈ w(a) + w(b).

At each level, all three heuristics (biggest_cell, chain, lowest_degree)
are evaluated and the one with minimum estimated resultant weight is
selected. When fewer than 2 root functions exist, the default heuristic
is used since all produce equivalent results.

Add parameter nlsat.lws_dynamic_heuristic (default: true) to enable or
disable dynamic selection. When disabled, the static heuristic from
lws_sector_rel_mode/lws_section_rel_mode is used.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* local optimization

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* call omit_lc only when both bounds are present

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* use std_vector

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* remove m_level_tags

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* count added lcs in the heuriistic estimates

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* add both side spanning tree heuristic

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* Fix nlsat projection bug: ensure polynomials with assumptions are also projected

When polynomials are added as assumptions (via add_assumption or ensure_sign),
they must also be added to the projection set (m_todo) to ensure proper cell
construction. Previously, assumptions were added without corresponding projection,
leading to unsound lemmas.

Fixes:
1. In normalize(): collect lower-stage polynomials in m_lower_stage_polys and
   add them to m_ps in main() before projection.
2. In ensure_sign(): call insert_fresh_factors_in_todo(p) after adding assumption.
3. In project_cdcac(): when levelwise fails, use flet to set m_add_all_coeffs=true
   for the fallback projection.

* Remove deprecated project_original and cell_sample parameter

- Remove project_original() function from nlsat_explain.cpp
- Remove m_sample_cell_project member variable
- Simplify project() to just call project_cdcac()
- Remove cell_sample parameter from nlsat_params.pyg
- Update nlsat_solver.cpp to remove cell_sample() references
- Update nlsat_explain.h constructor signature

* Enforce bound polynomial LC protection in compute_omit_lc functions

Move the invariant that bound-defining polynomials must never have their
LC omitted from add_level_projections_sector() into the source functions:
- compute_omit_lc_both_sides()
- compute_omit_lc_chain_extremes()

This centralizes the protection and removes the redundant override check.

* fix the build

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* bug fixes

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* restore a deleted function

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* remove sector/section stats

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* Simplify levelwise: remove chain/lowest_degree heuristics, unify relation
   mode

     - Remove chain and lowest_degree heuristics, keep only biggest_cell and spanning_tree
     - Unify m_sector_relation_mode and m_section_relation_mode into single m_rel_mode
     - Remove lws_rel_mode, lws_sector_rel_mode, lws_section_rel_mode, lws_dynamic_heuristic params
     - lws_spt_threshold < 2 now disables spanning tree (single tuning parameter)
     - Restore noDisc optimization for spanning_tree leaves connected to boundary
     - Add noDisc for sector with same_boundary_poly (treat like section case)
     - Significant code reduction (~390 lines removed)

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* fix bug with skipping too many discriminants

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* t

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* simplifications and bug fixes in lws, use static_tree only with sector + different bound polynomials, otherwise us biggest cell

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* bug fixes and cleanup

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* add the discriminant in degenerated case

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* fix a bug with skipping a vanishing discriminant

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* remove the unsound optimization

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* fiddle with heuristics

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* preserve random seed in nlsat_solver::check_lemma

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* fix a typo in poly_has_roots

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* add lc(p) and disc(p) for a rootless p in section case

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* remove warnings

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* untracking .beads

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* fix the explosion in m_todo with lws.false

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* fix issue 8397

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* set default to nlsat.lws=false for the merge with master

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* set nlsat.lws=true by default, enable levelwise

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

---------

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-18 20:58:03 -08:00
Copilot
957d548bdb Add std::initializer_list overloads for BV and arith operations (#8467)
* Initial plan

* Add std::initializer_list overloads for BV and arith functions

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

* Update call sites to use initializer_list format for BV and arith functions

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>
2026-02-18 20:58:02 -08:00
Copilot
29c583397f Expose timestamp method in sls_context (#8347)
* Initial plan

* Expose timestamp method in sls_context

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

---------

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-18 20:57:56 -08:00
Lev Nachmanson
059d936e08 preserve the initial state of the solver with push/pop for multiple objectives (#8264)
* preserve the initial state of the solver with push/pop for multiple objectives

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* Fix memory corruption in Z3_polynomial_subresultants

The API function had a memory corruption bug where allocating the result
vector while the default_expr2polynomial converter was still in scope
could corrupt the converter's internal expr2var mapping.

Fixed by restructuring the code to:
1. Complete all polynomial computation in a scoped block
2. Store results in a temporary expr_ref_vector
3. Let the converter go out of scope
4. Then allocate and populate the result vector

Also improved the test to:
- Use randomized testing with 20 iterations
- Test both cases: variable in polynomials and variable not in polynomials
- Use proper reference counting (inc_ref before dec_ref)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-18 20:57:53 -08:00
Copilot
046e1ab764 Refactor mk_and and mk_app to use std::span API (#8285)
* Initial plan

* Refactor mk_and and mk_app to use std::span

- Made mk_and(unsigned num_args, expr * const * args) private
- Added new public mk_and(std::span<expr* const> args) method
- Added new public mk_app(family_id fid, decl_kind k, std::span<expr* const> args) method
- Updated all convenience overloads to use std::span version
- Updated all external call sites to use the new std::span API

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

* Fix remaining test files to use std::span API

- Updated src/test/sorting_network.cpp
- Updated src/test/ho_matcher.cpp with explicit cast to resolve ambiguity

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

* Revert overlapping changes superseded by PR #8286

Reverted 30 files to match the state from PR #8286 (commit ebc0688) which refactored mk_and/mk_or call sites to use vector overloads. This supersedes the std::span changes in those files.

Retained std::span changes in files unique to this PR:
- Core API changes (ast.h, ast.cpp)
- Files not affected by PR #8286 (api_context.cpp, ast_util.cpp, bool_rewriter.h, datatype_rewriter.cpp, dom_simplifier.cpp, factor_rewriter.cpp, pb2bv_rewriter.cpp, quant_hoist.cpp, spacer_cluster_util.cpp, sortmax.cpp, array_axioms.cpp, smtfd_solver.cpp, goal.cpp, ho_matcher.cpp, qe_arith.cpp, sorting_network.cpp)
- Special case in hnf.cpp where both PRs modified different lines

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

---------

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-18 20:57:52 -08:00
Copilot
1d417e3a0f Refactor mk_and/mk_or call sites to use vector overloads (#8286)
* Initial plan

* Refactor mk_and and mk_or call sites to use overloaded methods

Changed 130 call sites across 64 files to use vector overloads directly instead of manually passing .size() and .data()/.c_ptr()

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

* Revert mk_or changes for ptr_buffer/ptr_vector (no overload exists in ast_util.h)

* Fix compilation errors from mk_and/mk_or refactoring

Fixed type mismatches by:
- Removing m parameter for expr_ref_vector (ast_util.h has mk_and/mk_or(expr_ref_vector) overloads)
- Reverting changes for ref_buffer types (no overload exists in ast_util.h, only in ast.h for m.mk_and)
- Verified build succeeds and Z3 works correctly

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

* Fix test files to use correct mk_and/mk_or overloads

Changed test/doc.cpp and test/udoc_relation.cpp to use mk_and(expr_ref_vector) and mk_or(expr_ref_vector) without m parameter

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

---------

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-18 20:57:52 -08:00
Copilot
3d7fbf9430 [WIP] Update code base to use std::span (#8269)
* Initial plan

* Add std::span to bit_util.h with backward compatibility

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

* Add std::span to hash.h unsigned_ptr_hash function

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

* Add std::span to ref_vector.h append and constructor

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>
2026-02-18 20:57:51 -08:00
Copilot
054a83e925 Adopt std::optional for try_get_value and try_get_size functions (#8268)
* Initial plan

* Convert try_get_value and try_get_size to use std::optional

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

* Add unit tests for std::optional conversions and fix compilation error

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

* Address code review comments - improve readability and reduce code duplication

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

---------

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-18 20:57:50 -08:00
Copilot
317dd92105 Standardize for-loop increments to prefix form (++i) (#8199)
* Initial plan

* Convert postfix to prefix increment in for loops

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

* Fix member variable increment conversion bug

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

* Update API generator to produce prefix increments

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

---------

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
2026-02-18 20:57:29 -08:00
Copilot
aaec2e032e Modernize C++ patterns: range-based for loops and nullptr (#8167)
* Initial plan

* Replace NULL with nullptr in test files

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

* Convert iterator loops to range-based for loops (part 1)

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

* Convert iterator loops to range-based for loops (part 2)

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

* Fix compilation errors in iterator loop conversions

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>
2026-02-18 20:57:10 -08:00
Nikolaj Bjorner
2e9da416f6 remove optional_benchmarks from CmakeLists
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
2026-02-18 20:57:09 -08:00
Copilot
0cc16b63c2 Replace custom util/optional with std::optional (#8162)
* Initial plan

* Replace optional with std::optional in source files

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

* Fix array_map contains() and remove optional_benchmark test

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

* Address code review feedback - simplify array_map and test

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

---------

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2026-02-18 20:57:09 -08:00
Nikolaj Bjorner
f15b0b2a56 cross-compile do_not_optimize
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
2026-02-18 20:57:09 -08:00