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Fix NLA optimization regression and relax restore_x

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- 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>
This commit is contained in:
Lev Nachmanson 2026-03-10 16:38:08 -10:00
parent bb11a56a67
commit 6d890fb026
8 changed files with 357 additions and 61 deletions
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1
src/util/trace_tags.def
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@ -542,6 +542,7 @@ X(Global, isolate_roots_bug, "isolate roots bug")
X(Global, ite_bug, "ite bug")
X(Global, lar_solver_feas, "lar solver feas")
X(Global, lar_solver_inf_heap, "lar solver inf heap")
X(Global, lar_solver_restore, "lar solver restore")
X(Global, Lazard, "Lazard")
X(Global, lcm_bug, "lcm bug")
X(Global, le_bug, "le bug")