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fix #5560 - add a throttle on maximal size of bignums created for propagate-value lemmas

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-09-21 08:55:28 -07:00
parent 2c266a96c8
commit 2e96557827
3 changed files with 32 additions and 2 deletions
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20
src/ast/rewriter/bool_rewriter.cpp
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@ -905,7 +905,26 @@ br_status bool_rewriter::mk_ite_core(expr * c, expr * t, expr * e, expr_ref & re
}
}
#if 0
expr* t1, *t2;
// (ite c (not (= t1 t2)) t1) ==> (not (= t1 (and c t2)))
if (m().is_not(t, t1) && m().is_eq(t1, t1, t2) && e == t1) {
expr_ref a(m());
mk_and(c, t2, a);
result = m().mk_not(m().mk_eq(t1, a));
return BR_REWRITE2;
}
if (m().is_not(t, t1) && m().is_eq(t1, t2, t1) && e == t1) {
expr_ref a(m());
mk_and(c, t2, a);
result = m().mk_eq(t1, a);
return BR_REWRITE2;
}
#endif
if (m().is_ite(t) && m_ite_extra_rules && m_elim_ite) {
std::cout << "extra rules\n";
// (ite c1 (ite c2 t1 t2) t1) ==> (ite (and c1 (not c2)) t2 t1)
if (e == to_app(t)->get_arg(1)) {
expr_ref not_c2(m());
@ -923,6 +942,7 @@ br_status bool_rewriter::mk_ite_core(expr * c, expr * t, expr * e, expr_ref & re
return BR_REWRITE1;
}
if (m().is_ite(e)) {
// (ite c1 (ite c2 t1 t2) (ite c3 t1 t2)) ==> (ite (or (and c1 c2) (and (not c1) c3)) t1 t2)
if (to_app(t)->get_arg(1) == to_app(e)->get_arg(1) &&