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bounds axiom tuning

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2014-08-31 11:16:08 -07:00
parent afe7fc367b
commit 37b96a6133
1 changed files with 73 additions and 1 deletions
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74
src/smt/theory_arith_core.h
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@ -818,6 +818,79 @@ namespace smt {
atoms & occs = m_var_occs[v];
typename atoms::iterator it = occs.begin();
typename atoms::iterator end = occs.end();
parameter coeffs[3] = { parameter(symbol("farkas")), parameter(rational(1)), parameter(rational(1)) };
optional<inf_numeral> lo_inf, lo_sup, hi_inf, hi_sup;
literal lit1, lit2, lit3, lit4;
for (; it != end; ++it) {
atom * a2 = *it;
literal l2(a2->get_bool_var());
inf_numeral const & k2 = a2->get_k();
atom_kind kind2 = a2->get_atom_kind();
SASSERT(k1 != k2 || kind1 != kind2);
if (kind2 == A_LOWER) {
if (k2 < k1) {
if (!lo_inf || k2 > *lo_inf) {
lo_inf = k2;
lit1 = l2;
}
}
else if (!lo_sup || k2 < *lo_sup) {
lo_sup = k2;
lit2 = l2;
}
}
else {
if (k2 < k1) {
if (!hi_inf || k2 > *hi_inf) {
hi_inf = k2;
lit3 = l2;
}
}
else if (!hi_sup || k2 < *hi_sup) {
hi_sup = k2;
lit4 = l2;
}
}
}
if (kind1 == A_LOWER) {
if (lo_inf) {
// k1 > lo_inf, k1 <= x => lo_inf <= x
mk_clause(~l1, lit1, 3, coeffs);
}
if (lo_sup) {
// k1 < lo_sup, lo_sup <= x => k1 <= x
mk_clause(l1, ~lit2, 3, coeffs);
}
if (hi_inf) {
// k1 > hi_inf, k1 <= x => ~(x <= hi_inf)
mk_clause(~l1, ~lit3, 3, coeffs);
}
if (hi_sup) {
// k1 < hi_sup, k1 <= x or x <= hi_sup
mk_clause(l1, lit4, 3, coeffs);
}
}
else {
if (lo_inf) {
// k1 > lo_inf, ~(k1 >= x) => lo_inf <= x
mk_clause(l1, lit1, 3, coeffs);
}
if (lo_sup) {
// k1 < lo_sup, lo_sup <= x => ~(x <= k1)
mk_clause(~l1, ~lit2, 3, coeffs);
}
if (hi_inf) {
// k1 > hi_inf, x <= hi_inf => x <= k1
mk_clause(l1, ~lit3, 3, coeffs);
}
if (hi_sup) {
// k1 < hi_sup, ~(x <= k1) or x <= hi_sup
mk_clause(~l1, lit4, 3, coeffs);
}
}
return;
for (; it != end; ++it) {
atom * a2 = *it;
literal l2(a2->get_bool_var());
@ -825,7 +898,6 @@ namespace smt {
atom_kind kind2 = a2->get_atom_kind();
SASSERT(k1 != k2 || kind1 != kind2);
SASSERT(a2->get_var() == v);
parameter coeffs[3] = { parameter(symbol("farkas")), parameter(rational(1)), parameter(rational(1)) };
if (kind1 == A_LOWER) {
if (kind2 == A_LOWER) {
// x >= k1, x >= k2