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Reuse power variables and symbolic characters

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This commit is contained in:
CEisenhofer 2026-03-31 16:36:10 +02:00
parent 54d52d882f
commit 14f71ea852
3 changed files with 89 additions and 8 deletions
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19
src/smt/seq/seq_nielsen.h
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@ -775,6 +775,16 @@ namespace seq {
// Pins the fresh length variable expressions so they aren't garbage collected.
expr_ref_vector m_len_vars;
// Cache: (var snode id, modification count) → fresh character variable
std::map<std::pair<unsigned, unsigned>, euf::snode*> m_char_var_cache;
// Cache: (var snode id, modification count) → fresh integer variable
std::map<std::pair<unsigned, unsigned>, expr*> m_gpower_n_var_cache;
std::map<std::pair<unsigned, unsigned>, expr*> m_gpower_m_var_cache;
// Pins the fresh gpower variable expressions so they aren't garbage collected.
expr_ref_vector m_gpower_vars;
// Arena for dep_tracker nodes. Declared mutable so that const methods
// (e.g., explain_conflict) can call mk_join / linearize.
mutable dep_manager m_dep_mgr;
@ -1140,6 +1150,15 @@ namespace seq {
// modification count. Returns str.len(var_expr) when mod_count == 0.
expr_ref get_or_create_len_var(euf::snode* var, unsigned mod_count);
// Get or create a fresh character variable for a variable at a given modification count.
euf::snode* get_or_create_char_var(euf::snode* var, unsigned mod_count);
// Get or create a fresh integer variable for gpower n (full exponent) at a given modification count.
expr_ref get_or_create_gpower_n_var(euf::snode* var, unsigned mod_count);
// Get or create a fresh integer variable for gpower m (partial exponent) at a given modification count.
expr_ref get_or_create_gpower_m_var(euf::snode* var, unsigned mod_count);
// Compute and add |x| = |u| length constraints to an edge for all
// its non-eliminating substitutions. Uses current m_mod_cnt.
// Temporarily bumps m_mod_cnt for RHS computation, then restores.