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Port ZIPT Parikh features: minterm_to_char_set, char range constraints, fix stride soundness

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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copilot-swe-agent[bot] 2026-03-11 17:21:27 +00:00
parent 45a574d7fa
commit 194dfe6c61
3 changed files with 122 additions and 37 deletions
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11
src/smt/seq/seq_nielsen.cpp
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@ -2301,8 +2301,15 @@ namespace seq {
nielsen_subst s(first, replacement, mem.m_dep);
e->add_subst(s);
child->apply_subst(m_sg, s);
// TODO: derive char_set from minterm and add as range constraint
// child->add_char_range(fresh_char, minterm_to_char_set(mt));
// Constrain fresh_char to the character class of this minterm.
// This is the key Parikh pruning step: when x → ?c · x' is
// generated from minterm m_i, ?c must belong to the character
// class described by m_i so that str ∈ derivative(R, m_i).
if (mt->get_expr()) {
char_set cs = m_parith->minterm_to_char_set(mt->get_expr());
if (!cs.is_empty())
child->add_char_range(fresh_char, cs);
}
created = true;
}