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ensure stoi axiom even when no value is present for argument. Issue #731

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-09-10 09:40:21 -07:00
parent d74e618565
commit 2f67665c7e
1 changed files with 9 additions and 9 deletions
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18
src/smt/theory_seq.cpp
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@ -2260,7 +2260,6 @@ bool theory_seq::add_itos_axiom(expr* e) {
app_ref e1(m_util.str.mk_string(symbol(val.to_string().c_str())), m);
expr_ref n1(arith_util(m).mk_numeral(val, true), m);
#if 1
// itos(n) = "25" <=> n = 25
literal eq1 = mk_eq(n1, n , false);
literal eq2 = mk_eq(e, e1, false);
@ -2269,18 +2268,19 @@ bool theory_seq::add_itos_axiom(expr* e) {
ctx.force_phase(eq1);
ctx.force_phase(eq2);
#else
// "25" = itos(25)
// stoi(itos(n)) = n
app_ref e2(m_util.str.mk_stoi(e), m);
add_axiom(mk_eq(e2, n, false));
add_axiom(mk_eq(m_util.str.mk_itos(n1), e1, false));
#endif
m_trail_stack.push(insert_map<theory_seq, rational_set, rational>(m_itos_axioms, val));
m_trail_stack.push(push_replay(alloc(replay_axiom, m, e)));
return true;
}
}
}
else {
// stoi(itos(n)) = n
app_ref e2(m_util.str.mk_stoi(e), m);
add_axiom(mk_eq(e2, n, false));
m_trail_stack.push(push_replay(alloc(replay_axiom, m, e)));
return true;
}
return false;
}