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Porting seq_split to master (#9840)

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Co-authored-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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Clemens Eisenhofer 2026-06-30 19:18:28 +02:00 • committed by GitHub
parent c22a7bac7c
commit b3143e759b
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11 changed files with 1545 additions and 1 deletions
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24
src/smt/seq_regex.cpp
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@ -128,6 +128,30 @@ namespace smt {
return;
}
if (th.get_fparams().m_seq_regex_factorization_enabled) {
unsigned threshold = th.get_fparams().m_seq_regex_factorization_threshold;
if (threshold == 0)
threshold = UINT_MAX;
split_set result;
auto [head, tail] = seq_rw().split_membership(s, r, threshold, result);
if (head) {
SASSERT(tail);
// propagate all cases
expr_ref_vector cases(m);
expr_ref_vector branches(m);
for (auto [pre, post] : result) {
expr_ref mem_head(re().mk_in_re(head, pre), m);
expr_ref mem_tail(re().mk_in_re(tail, post), m);
cases.push_back(m.mk_and(mem_head, mem_tail));
}
const expr_ref cases_expr(m.mk_or(cases), m);
ctx.internalize(cases_expr, false);
th.propagate_lit(nullptr, 1, &lit, ctx.get_literal(cases_expr));
return;
}
// fallthrough; decomposition failed
}
// Convert a non-ground sequence into an additional regex and
// strengthen the original regex constraint into an intersection
// for example: