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slicing: track disequalities

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This commit is contained in:
Jakob Rath 2023-07-19 12:04:45 +02:00
parent 970e68c70e
commit af73f26941
4 changed files with 157 additions and 17 deletions
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85
src/test/slicing.cpp
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@ -1,6 +1,24 @@
#include "math/polysat/slicing.h"
#include "math/polysat/solver.h"
namespace {
template <typename T>
void permute_args(unsigned k, T& a, T& b, T& c) {
using std::swap;
SASSERT(k < 6);
unsigned i = k % 3;
unsigned j = k % 2;
if (i == 1)
swap(a, b);
else if (i == 2)
swap(a, c);
if (j == 1)
swap(b, c);
}
}
namespace polysat {
struct solver_scope_slicing {
@ -200,6 +218,61 @@ namespace polysat {
VERIFY(sl.invariant());
}
static void test6() {
std::cout << __func__ << "\n";
scoped_solver_slicing s;
slicing& sl = s.sl();
pdd x = s.var(s.add_var(8));
pdd y = s.var(s.add_var(8));
pdd z = s.var(s.add_var(8));
sl.add_constraint(s.eq(x, z));
sl.add_constraint(s.eq(y, z));
sl.add_constraint(s.eq(x, rational(5)));
sl.add_value(x.var(), rational(5));
sl.add_value(y.var(), rational(7));
SASSERT(sl.is_conflict());
sat::literal_vector reason_lits;
unsigned_vector reason_vars;
sl.explain(reason_lits, reason_vars);
std::cout << "Conflict: " << reason_lits << " vars " << reason_vars << "\n";
sl.display_tree(std::cout);
VERIFY(sl.invariant());
}
// x != z
// x = y
// y = z
// in various permutations
static void test7() {
std::cout << __func__ << "\n";
scoped_set_log_enabled _logging(false);
scoped_solver_slicing s;
slicing& sl = s.sl();
pdd x = s.var(s.add_var(8));
pdd y = s.var(s.add_var(8));
pdd z = s.var(s.add_var(8));
for (unsigned k = 0; k < 6; ++k) {
s.push();
signed_constraint c1 = s.diseq(x, z);
signed_constraint c2 = s.eq(x, y);
signed_constraint c3 = s.eq(y, z);
permute_args(k, c1, c2, c3);
sl.add_constraint(c1);
sl.add_constraint(c2);
sl.add_constraint(c3);
SASSERT(sl.is_conflict());
sat::literal_vector reason_lits;
unsigned_vector reason_vars;
sl.explain(reason_lits, reason_vars);
std::cout << "Conflict: " << reason_lits << " vars " << reason_vars << "\n";
// sl.display_tree(std::cout);
VERIFY(sl.invariant());
s.pop();
}
}
};
}
@ -207,10 +280,12 @@ namespace polysat {
void tst_slicing() {
using namespace polysat;
test_slicing::test1();
test_slicing::test2();
test_slicing::test3();
test_slicing::test4();
test_slicing::test5();
// test_slicing::test1();
// test_slicing::test2();
// test_slicing::test3();
// test_slicing::test4();
// test_slicing::test5();
// test_slicing::test6();
test_slicing::test7();
std::cout << "ok\n";
}