mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-05-14 03:04:44 +00:00
Code Activity

fix #4079

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-23 22:35:33 -07:00
parent 64cb5cad81
commit eb2d7d3e81
3 changed files with 19 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

23
src/smt/seq_eq_solver.cpp
View file

@ -750,10 +750,10 @@ void theory_seq::branch_unit_variable(dependency* dep, expr* X, expr_ref_vector
bool theory_seq::branch_ternary_variable1() {
int start = get_context().get_random_value();
for (unsigned i = 0; i < m_eqs.size(); ++i) {
eq const& e = m_eqs[(i + start) % m_eqs.size()];
if (branch_ternary_variable(e) || branch_ternary_variable2(e)) {
if (branch_ternary_variable(m_eqs[(i + start) % m_eqs.size()]))
return true;
if (branch_ternary_variable2(m_eqs[(i + start) % m_eqs.size()]))
return true;
}
}
return false;
}
@ -917,20 +917,10 @@ bool theory_seq::branch_ternary_variable(eq const& e, bool flag1) {
expr_ref y1ysZ = mk_concat(y1ys, Z);
if (indexes.empty()) {
return false;
#if 0
TRACE("seq", display_equation(tout << "one case\n", e);
tout << "xs: " << xs << "\n";
tout << "ys: " << ys << "\n";);
literal_vector lits;
dependency* dep = e.dep();
propagate_eq(dep, lits, x, y1ysZ, true);
propagate_eq(dep, lits, y2, ZxsE, true);
#endif
}
literal ge = m_ax.mk_ge(mk_len(y2), xs.size());
dependency* dep = e.dep();
literal_vector lits;
switch (ctx.get_assignment(ge)) {
case l_undef:
TRACE("seq", tout << "rec case init\n";);
@ -940,12 +930,11 @@ bool theory_seq::branch_ternary_variable(eq const& e, bool flag1) {
case l_true:
TRACE("seq", tout << "true branch\n";);
TRACE("seq", display_equation(tout, e););
lits.push_back(ge);
propagate_eq(dep, lits, x, y1ysZ, true);
propagate_eq(dep, lits, y2, ZxsE, true);
propagate_eq(dep, ge, x, y1ysZ, true);
propagate_eq(dep, ge, y2, ZxsE, true);
break;
default:
return branch_ternary_variable_base(e.dep(), indexes, x, xs, y1, ys, y2);
return branch_ternary_variable_base(dep, indexes, x, xs, y1, ys, y2);
}
return true;
}