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Replace apply_regex_unit_split with apply_regex_if_split (#9210)

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Copilot 2026-04-02 14:27:06 -07:00 • committed by GitHub
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commit ddd8bf84d7
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2 changed files with 32 additions and 56 deletions
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9
src/smt/seq/seq_nielsen.h
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@ -730,7 +730,7 @@ namespace seq {
unsigned m_mod_num_cmp = 0;
unsigned m_mod_split_power_elim = 0;
unsigned m_mod_const_num_unwinding = 0;
unsigned m_mod_regex_unit_split = 0;
unsigned m_mod_regex_if_split = 0;
unsigned m_mod_eq_split = 0;
unsigned m_mod_star_intr = 0;
unsigned m_mod_gpower_intr = 0;
@ -1060,10 +1060,9 @@ namespace seq {
// mirrors ZIPT's ConstNumUnwindingModifier
bool apply_const_num_unwinding(nielsen_node* node);
// regex unit split: for str_mem c·s ∈ R where c is a symbolic unit,
// branch over regex minterms and constrain c via char_range.
// Unlike apply_regex_var_split, no substitution and no epsilon branch.
bool apply_regex_unit_split(nielsen_node* node);
// regex if split: for str_mem s ∈ R where R decomposes as ite(c, th, el),
// branch into s ∈ th under condition c, and s ∈ el under condition ¬c.
bool apply_regex_if_split(nielsen_node* node);
// star introduction: for a str_mem x·s ∈ R where a cycle is detected
// (backedge exists), introduce stabilizer: x ∈ base* with x split.