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throttle digit constraints

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-22 17:55:18 -07:00
parent c7878e384c
commit 8fe3caa101
2 changed files with 4 additions and 1 deletions
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4
src/smt/theory_seq.cpp
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@ -982,7 +982,9 @@ bool theory_seq::solve_itos(expr* n, expr_ref_vector const& rs, dependency* dep)
}
expr* u = nullptr;
for (expr* r : rs) {
if (m_util.str.is_unit(r, u)) {
if (m_util.str.is_unit(r, u) && !m_is_digit.contains(u)) {
m_is_digit.insert(u);
m_trail_stack.push(insert_obj_trail<theory_seq, expr>(m_is_digit, u));
literal is_digit = m_ax.is_digit(u);
if (get_context().get_assignment(is_digit) != l_true) {
propagate_lit(dep, 0, nullptr, is_digit);

1
src/smt/theory_seq.h
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@ -425,6 +425,7 @@ namespace smt {
re2automaton m_mk_aut;
obj_hashtable<expr> m_fixed; // string variables that are fixed length.
obj_hashtable<expr> m_is_digit; // expressions that have been constrained to be digits
void init(context* ctx) override;
final_check_status final_check_eh() override;