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Draft: Made division/remainder to op_constraints (not yet used - old code still called)

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This commit is contained in:
Clemens Eisenhofer 2023-02-09 23:36:15 +01:00
parent e31eb9a6b1
commit 6b48b25beb
6 changed files with 219 additions and 6 deletions
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45
src/math/polysat/constraint_manager.cpp
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@ -528,4 +528,49 @@ namespace polysat {
return p.manager().mk_val(p.val().pseudo_inverse(p.power_of_2()));
return mk_op_term(op_constraint::code::inv_op, p, p.manager().zero());
}
pdd constraint_manager::udiv(pdd const& p, pdd const& q) {
return div_rem_op_constraint(p, q).first;
}
pdd constraint_manager::urem(pdd const& p, pdd const& q) {
return div_rem_op_constraint(p, q).second;
}
/** unsigned quotient/remainder */
std::pair<pdd, pdd> constraint_manager::div_rem_op_constraint(pdd const& a, pdd const& b) {
auto& m = a.manager();
unsigned sz = m.power_of_2();
if (b.is_zero()) {
// By SMT-LIB specification, b = 0 ==> q = -1, r = a.
return {m.mk_val(m.max_value()), a};
}
if (b.is_one()) {
return {a, m.zero()};
}
if (a.is_val() && b.is_val()) {
rational const av = a.val();
rational const bv = b.val();
SASSERT(!bv.is_zero());
rational rv;
rational qv = machine_div_rem(av, bv, rv);
pdd q = m.mk_val(qv);
pdd r = m.mk_val(rv);
SASSERT_EQ(a, b * q + r);
SASSERT(b.val()*q.val() + r.val() <= m.max_value());
SASSERT(r.val() <= (b*q+r).val());
SASSERT(r.val() < b.val());
return {std::move(q), std::move(r)};
}
pdd quot = mk_op_term(op_constraint::code::udiv_op, a, b);
pdd rem = mk_op_term(op_constraint::code::urem_op, a, b);
op_constraint* op1 = (op_constraint*)mk_op_constraint(op_constraint::code::udiv_op, a, b, quot).get();
op_constraint* op2 = (op_constraint*)mk_op_constraint(op_constraint::code::urem_op, a, b, quot).get();
op1->m_linked = op2;
op2->m_linked = op1;
return {std::move(quot), std::move(rem)};
}
}