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nseq: port ZIPT regex pre-check to fix benchmark discrepancy on regex-only problems (#8994)

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* Initial plan

* Port ZIPT regex pre-check and DFS node budget to address nseq benchmark discrepancy

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>
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Copilot 2026-03-15 10:10:53 -07:00 • committed by GitHub
parent 2212f59704
commit d53846d501
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4
src/smt/seq/seq_nielsen.cpp
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@ -2172,6 +2172,10 @@ namespace seq {
if (m_cancel_fn && m_cancel_fn())
return search_result::unknown;
// check DFS node budget (0 = unlimited)
if (m_max_nodes > 0 && m_stats.m_num_dfs_nodes > m_max_nodes)
return search_result::unknown;
// revisit detection: if already visited this run, return cached status.
// mirrors ZIPT's NielsenNode.GraphExpansion() evalIdx check.
if (node->eval_idx() == m_run_idx) {