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fix axiomatization of str.replace. Fixes issue #703

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-08-20 06:05:13 -07:00
parent 439e8e6b04
commit 2d8325ed43
1 changed files with 4 additions and 2 deletions
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6
src/smt/theory_seq.cpp
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@ -2902,9 +2902,11 @@ void theory_seq::add_replace_axiom(expr* r) {
expr_ref xty = mk_concat(x, t, y); expr_ref xty = mk_concat(x, t, y);
expr_ref xsy = mk_concat(x, s, y); expr_ref xsy = mk_concat(x, s, y);
literal cnt = mk_literal(m_util.str.mk_contains(a ,s)); literal cnt = mk_literal(m_util.str.mk_contains(a ,s));
literal a_emp = mk_eq_empty(a);
add_axiom(~a_emp, mk_seq_eq(r, a));
add_axiom(cnt, mk_seq_eq(r, a)); add_axiom(cnt, mk_seq_eq(r, a));
add_axiom(~cnt, mk_seq_eq(a, xsy)); add_axiom(~cnt, a_emp, mk_seq_eq(a, xsy));
add_axiom(~cnt, mk_seq_eq(r, xty)); add_axiom(~cnt, a_emp, mk_seq_eq(r, xty));
tightest_prefix(s, x); tightest_prefix(s, x);
} }