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add cutting plane

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-11-07 01:30:19 -08:00
parent d434cbea41
commit 220b339e5e
1 changed files with 23 additions and 133 deletions
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156
src/smt/theory_card.cpp
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@ -134,6 +134,29 @@ namespace smt {
args.resize(args.size()-1);
}
}
// apply cutting plane reduction:
if (!args.empty()) {
unsigned g = abs(args[0].second);
for (unsigned i = 1; g > 1 && i < args.size(); ++i) {
g = gcd(g, args[i].second);
}
if (g > 1) {
unsigned k = c->m_k;
if (k >= 0) {
c->m_k /= g;
}
else {
// watch out for truncation semantcs for k < 0!
k = abs(k);
k += (k % g);
k /= g;
k = -k;
}
for (unsigned i = 0; i < args.size(); ++i) {
args[i].second /= g;
}
}
}
int min = 0, max = 0;
for (unsigned i = 0; i < args.size(); ++i) {
@ -419,137 +442,4 @@ namespace smt {
TRACE("card", ctx.display_literals_verbose(tout, lits.size(), lits.c_ptr()); tout << "\n";);
ctx.mk_th_axiom(get_id(), lits.size(), lits.c_ptr());
}
#if 1
#endif
}
#if 0
expr_ref_vector merge(expr_ref_vector const& l1, expr_ref_vector const& l2) {
if (l1.empty()) {
return l2;
}
if (l2.empty()) {
return l1;
}
expr_ref_vector result(m);
if (l1.size() == 1 && l2.size() == 1) {
result.push_back(l1[0]);
result.push_back(l2[0]);
exchange(0, 1, result);
return result;
}
unsigned l1o = l1.size()/2;
unsigned l2o = l2.size()/2;
unsigned l1e = (l1.size() % 2 == 1) ? l1o + 1 : l1o;
unsigned l2e = (l2.size() % 2 == 1) ? l2o + 1 : l2o;
expr_ref_vector evenl1(m), oddl1(m), evenl2(m), oddl2(m);
evenl1.resize(l1e);
oddl1.resize(l1o);
evenl2.resize(l2e);
oddl2.resize(l2o);
for (unsigned i = 0; i < l1.size(); ++i) {
if (i % 2 == 0) {
evenl1[i/2] = l1[i];
}
else {
oddl1[i/2] = l1[i];
}
}
for (unsigned i = 0; i < l2.size(); ++i) {
if (i % 2 == 0) {
evenl2[i/2] = l2[i];
}
else {
oddl2[i/2] = l2[i];
}
}
expr_ref_vector even = merge(evenl1, evenl2);
expr_ref_vector odd = merge(oddl1, oddl2);
result.resize(l1.size() + l2.size());
for (unsigned i = 0; i < result.size(); ++i) {
if (i % 2 == 0) {
result[i] = even[i/2].get();
if (i > 0) {
exchange(i - 1, i, result);
}
}
else {
if (i /2 < odd.size()) {
result[i] = odd[i/2].get();
}
else {
result[i] = even[(i/2)+1].get();
}
}
}
return result;
}
Sorting networks used in Formula:
public SortingNetwork(SymbolicState owner, Term[] inputs, Sort sortingDomain)
{
Contract.Requires(owner != null && inputs != null && sortingDomain != null);
Contract.Requires(inputs.Length > 0);
Owner = owner;
Size = (int)Math.Pow(2, (int)Math.Ceiling(Math.Log(inputs.Length, 2)));
if (Size == 1)
{
elements = new Term[1];
elements[0] = inputs[0];
}
else if (Size > 1)
{
var defaultElement = owner.Context.MkNumeral(0, sortingDomain);
current = new int[Size];
next = new int[Size];
elements = new Term[Size];
for (int i = 0; i < Size; ++i)
{
current[i] = i;
elements[i] = (i < Size - inputs.Length) ? defaultElement : inputs[i - (Size - inputs.Length)];
}
int k = 2;
Term xi;
while (k <= Size)
{
Sort(k);
for (int i = 0; i < Size; ++i)
{
xi = owner.Context.MkFreshConst("x", sortingDomain);
owner.Context.AssertCnstr(owner.Context.MkEq(xi, elements[i]));
elements[i] = xi;
}
for (int i = 0; i < elements.Length / k; ++i)
{
for (int j = 0; j < k - 1; ++j)
{
owner.Context.AssertCnstr(owner.Context.MkBvUle(elements[(k * i) + j], elements[(k * i) + j + 1]));
}
}
k *= 2;
}
}
}
}
#endif