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fixes to seq solver

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This commit is contained in:
Nikolaj Bjorner 2021-02-25 10:35:14 -08:00
parent 080c9c6893
commit 64ba0b631a
3 changed files with 46 additions and 79 deletions
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28
src/smt/theory_seq.cpp
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@ -2544,7 +2544,7 @@ void theory_seq::deque_axiom(expr* n) {
m_ax.add_replace_axiom(n);
}
else if (m_util.str.is_extract(n)) {
m_ax.add_extract_axiom(purify(n));
m_ax.add_extract_axiom(n);
}
else if (m_util.str.is_at(n)) {
m_ax.add_at_axiom(n);
@ -2583,32 +2583,6 @@ void theory_seq::deque_axiom(expr* n) {
}
}
expr_ref theory_seq::purify(expr* e) {
app* a = to_app(e);
expr_ref_vector args(m);
bool has_fresh = false;
for (expr* arg : *a) {
expr_ref tmp(m);
m_rewrite(arg, tmp);
if (arg != tmp) {
has_fresh = true;
tmp = m.mk_fresh_const("purify", arg->get_sort());
enode* n1 = ctx.get_enode(arg);
enode* n2 = ensure_enode(tmp);
justification* js = ctx.mk_justification(
ext_theory_eq_propagation_justification(
get_id(), ctx.get_region(), 0, nullptr, 0, nullptr, n1, n2));
ctx.assign_eq(n1, n2, eq_justification(js));
}
args.push_back(tmp);
}
if (has_fresh)
return expr_ref(m.mk_app(a->get_decl(), args), m);
return expr_ref(a, m);
}
expr_ref theory_seq::add_elim_string_axiom(expr* n) {
zstring s;
TRACE("seq", tout << mk_pp(n, m) << "\n";);