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fix #2060. Code comment was right, code wasn't. Code comment and code could also be tuned

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-01-06 20:20:34 -08:00
parent ea48d0a95a
commit 6113149138
1 changed files with 4 additions and 2 deletions
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6
src/smt/theory_seq.cpp
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@ -3536,7 +3536,7 @@ expr_ref theory_seq::digit2int(expr* ch) {
// n >= 0 & len(e) = k => is_digit(e_i) for i = 0..k-1
// n >= 0 & len(e) >= i + 1 => is_digit(e_i) for i = 0..k-1
// n >= 0 & len(e) = k => n = sum 10^i*digit(e_i)
// n < 0 & len(e) = k => \/_i ~is_digit(e_i) for i = 0..k-1
// 10^k <= n < 10^{k+1}-1 => len(e) = k
@ -3556,7 +3556,9 @@ void theory_seq::add_si_axiom(expr* e, expr* n, unsigned k) {
for (unsigned i = 0; i < k; ++i) {
ith_char = mk_nth(e, m_autil.mk_int(i));
literal isd = is_digit(ith_char);
add_axiom(~len_eq_k, ~ge0, isd);
literal len_ge_i1 = mk_literal(m_autil.mk_ge(len, m_autil.mk_int(i+1)));
add_axiom(~len_ge_i1, ~ge0, isd);
digits.push_back(~isd);
chars.push_back(m_util.str.mk_unit(ith_char));
nums.push_back(digit2int(ith_char));
}