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prepare for printing more cases of root objects in SMT

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This commit is contained in:
Nikolaj Bjorner 2024-01-22 15:47:43 -08:00
parent 69f118e77f
commit 0ebd8d655b
1 changed files with 35 additions and 4 deletions
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39
src/nlsat/nlsat_solver.cpp
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@ -3081,11 +3081,42 @@ namespace nlsat {
return out;
}
std::ostream& display_smt2(std::ostream & out, root_atom const & a, display_var_proc const & proc) const {
return display(out, a, proc);
}
std::ostream& display(std::ostream & out, root_atom const & a, display_var_proc const & proc) const {
std::ostream& display_linear_root_smt2(std::ostream & out, root_atom const & a, display_var_proc const & proc) const {
polynomial_ref A(m_pm), B(m_pm);
polynomial::scoped_numeral one(m_qm);
m_pm.m().set(one, 1);
A = m_pm.derivative(a.p(), a.x());
B = m_pm.substitute(a.p(), a.x(), one);
// x < root[1](ax + b) == (a > 0 => ax < b) & (a < 0 => ax > b)
char const* rel1 = "<", *rel2 = ">";
switch (a.get_kind()) {
case atom::ROOT_LT: rel1 = "<"; rel2 = ">"; break;
case atom::ROOT_GT: rel1 = ">"; rel2 = "<"; break;
case atom::ROOT_LE: rel1 = "<="; rel2 = ">="; break;
case atom::ROOT_GE: rel1 = ">="; rel2 = "<="; break;
case atom::ROOT_EQ: rel1 = rel2 = "="; break;
default: UNREACHABLE(); break;
}
out << "(and ";
out << "(=> (> "; m_pm.display_smt2(out, A, proc); out << " 0) ";
out << "(" << rel1 << " (* "; proc(out, a.x()); out << " "; m_pm.display_smt2(out, A, proc); out << " "; m_pm.display_smt2(out, B, proc); out << ")) ";
out << "(=> (< "; m_pm.display_smt2(out, A, proc); out << " 0) ";
out << "(" << rel2 << " (* "; proc(out, a.x()); out << " "; m_pm.display_smt2(out, A, proc); out << " "; m_pm.display_smt2(out, B, proc); out << ")) ";
out << ")";
return out;
}
std::ostream& display_smt2(std::ostream & out, root_atom const & a, display_var_proc const & proc) const {
#if 0
if (a.i() == 1 && m_pm.degree(a.p(), a.x()) == 1)
return display_linear_root_smt2(out, a, proc);
#endif
proc(out, a.x());
switch (a.get_kind()) {
case atom::ROOT_LT: out << " < "; break;