mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-07 18:05:21 +00:00
Code Activity

fix arith_solver=6 regression over solver=2

Browse source 
https://github.com/Z3Prover/z3/issues/4613#issuecomment-668047545
This commit is contained in:
Nikolaj Bjorner 2020-12-08 16:36:43 -08:00
parent fae9481308
commit 621e99284b
1 changed files with 2 additions and 31 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

33
src/smt/theory_seq.cpp
View file

@ -2685,37 +2685,8 @@ bool theory_seq::upper_bound(expr* e, rational& hi) const {
// we have to traverse the eqc to query for the better lower bound.
bool theory_seq::lower_bound2(expr* _e, rational& lo) {
expr_ref e = mk_len(_e);
expr_ref _lo(m);
theory_mi_arith* tha = get_th_arith<theory_mi_arith>(ctx, m_autil.get_family_id(), e);
if (!tha) {
theory_i_arith* thi = get_th_arith<theory_i_arith>(ctx, m_autil.get_family_id(), e);
if (!thi || !thi->get_lower(ctx.get_enode(e), _lo) || !m_autil.is_numeral(_lo, lo)) return false;
}
enode *ee = ctx.get_enode(e);
if (tha && (!tha->get_lower(ee, _lo) || m_autil.is_numeral(_lo, lo))) {
enode *next = ee->get_next();
bool flag = false;
while (next != ee) {
if (!m_autil.is_numeral(next->get_owner()) && !m_util.str.is_length(next->get_owner())) {
expr *var = next->get_owner();
TRACE("seq_verbose", tout << mk_pp(var, m) << "\n";);
expr_ref _lo2(m);
rational lo2;
if (tha->get_lower(next, _lo2) && m_autil.is_numeral(_lo2, lo2) && lo2>lo) {
flag = true;
lo = lo2;
literal low(mk_literal(m_autil.mk_ge(var, _lo2)));
add_axiom(~low, mk_literal(m_autil.mk_ge(e, _lo2)));
}
}
next = next->get_next();
}
if (flag)
return true;
if (!tha->get_lower(ee, _lo))
return false;
}
return true;
bool is_strict = false;
return m_arith_value.get_lo_equiv(e, lo, is_strict) && !is_strict;
}
bool theory_seq::get_length(expr* e, rational& val) {