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some fixes

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-17 07:33:43 -07:00
parent 501aa7927d
commit a83f72b657
6 changed files with 30 additions and 16 deletions
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18
src/smt/seq_axioms.cpp
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@ -39,6 +39,13 @@ literal seq_axioms::mk_eq(expr* a, expr* b) {
return th.mk_eq(a, b, false);
}
expr_ref seq_axioms::mk_sub(expr* x, expr* y) {
expr_ref result(a.mk_sub(x, y), m);
m_rewrite(result);
return result;
}
literal seq_axioms::mk_literal(expr* _e) {
expr_ref e(_e, m);
if (a.is_arith_expr(e)) {
@ -510,7 +517,7 @@ void seq_axioms::add_itos_axiom(expr* e) {
// itos(n) = "" or n >= 0
add_axiom(~eq1, ~ge0);
add_axiom(eq1, ge0);
add_axiom(mk_literal(a.mk_ge(mk_len(e), a.mk_int(0))));
add_axiom(mk_literal(a.mk_ge(mk_len(e), zero)));
// n >= 0 => stoi(itos(n)) = n
app_ref stoi(seq.str.mk_stoi(e), m);
@ -519,9 +526,12 @@ void seq_axioms::add_itos_axiom(expr* e) {
// itos(n) does not start with "0" when n > 0
// n = 0 or at(itos(n),0) != "0"
// alternative: n >= 0 => itos(stoi(itos(n))) = itos(n)
add_axiom(mk_eq(n, zero),
~mk_eq(seq.str.mk_at(e,zero),
seq.str.mk_string(symbol("0"))));
expr_ref zs(seq.str.mk_string(symbol("0")), m);
m_rewrite(zs);
literal eq0 = mk_eq(n, zero);
literal at0 = mk_eq(seq.str.mk_at(e, zero), zs);
add_axiom(eq0, ~at0);
add_axiom(~eq0, mk_eq(e, zs));
}
/**