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debug benchmarks, theory_pb

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-12-19 07:40:18 +02:00
parent cff0e0fc6c
commit 26237a3727
5 changed files with 108 additions and 30 deletions
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116
src/smt/theory_pb.cpp
View file

@ -76,21 +76,54 @@ namespace smt {
}
// sort and coalesce arguments:
std::sort(args.begin(), args.end());
for (unsigned i = 0; i + 1 < size(); ++i) {
if (lit(i) == args[i+1].first) {
args[i].second += coeff(i+1);
for (unsigned j = i+1; j + 1 < size(); ++j) {
args[j] = args[j+1];
}
args.pop_back();
unsigned i = 0, j = 1;
for (; j < size(); ++i) {
SASSERT(j > i);
literal l = lit(i);
for (; j < size() && lit(j) == lit(i); ++j) {
args[i].second += coeff(j);
}
if (coeff(i).is_zero()) {
for (unsigned j = i; j + 1 < size(); ++j) {
args[j] = args[j+1];
}
args.pop_back();
if (j < size()) {
args[i+1].first = lit(j);
args[i+1].second = coeff(j);
++j;
}
}
}
if (i + 1 < size()) {
args.resize(i+1);
}
}
void theory_pb::ineq::prune() {
numeral& k = m_k;
arg_t& args = m_args;
numeral nlt(0);
unsigned occ = 0;
for (unsigned i = 0; nlt < k && i < size(); ++i) {
if (coeff(i) < k) {
nlt += coeff(i);
++occ;
}
}
if (0 < occ && nlt < k) {
IF_VERBOSE(2, verbose_stream() << "prune\n";
for (unsigned i = 0; i < size(); ++i) {
verbose_stream() << coeff(i) << "*" << lit(i) << " ";
}
verbose_stream() << " >= " << k << "\n";
);
for (unsigned i = 0; i < size(); ++i) {
if (coeff(i) < k) {
args[i] = args.back();
args.pop_back();
--i;
}
}
normalize();
}
}
lbool theory_pb::ineq::normalize() {
@ -121,20 +154,28 @@ namespace smt {
// detect tautologies:
if (k <= numeral::zero()) {
args.reset();
k = numeral::zero();
return l_true;
}
// detect infeasible constraints:
if (sum < k) {
args.reset();
k = numeral::one();
return l_false;
}
// normalize to integers.
numeral d(denominator(k));
for (unsigned i = 0; i < size(); ++i) {
d = lcm(d, denominator(coeff(i)));
bool all_int = true;
for (unsigned i = 0; all_int && i < size(); ++i) {
all_int = coeff(i).is_int();
}
if (!d.is_one()) {
if (!all_int) {
// normalize to integers.
numeral d(denominator(k));
for (unsigned i = 0; i < size(); ++i) {
d = lcm(d, denominator(coeff(i)));
}
SASSERT(!d.is_one());
k *= d;
for (unsigned i = 0; i < size(); ++i) {
args[i].second *= d;
@ -182,6 +223,13 @@ namespace smt {
k = numeral::one();
}
else if (g > numeral::one()) {
IF_VERBOSE(2, verbose_stream() << "cut " << g << "\n";
for (unsigned i = 0; i < size(); ++i) {
verbose_stream() << coeff(i) << "*" << lit(i) << " ";
}
verbose_stream() << " >= " << k << "\n";
);
//
// Example 5x + 5y + 2z + 2u >= 5
// becomes 3x + 3y + z + u >= 3
@ -226,6 +274,13 @@ namespace smt {
numeral n1 = floor(n0);
numeral n2 = ceil(k/min) - numeral::one();
if (n1 == n2 && !n0.is_int()) {
IF_VERBOSE(2, verbose_stream() << "set cardinality\n";
for (unsigned i = 0; i < size(); ++i) {
verbose_stream() << coeff(i) << "*" << lit(i) << " ";
}
verbose_stream() << " >= " << k << "\n";
);
for (unsigned i = 0; i < size(); ++i) {
args[i].second = numeral::one();
}
@ -300,6 +355,8 @@ namespace smt {
bool_var abv = ctx.mk_bool_var(atom);
ctx.set_var_theory(abv, get_id());
IF_VERBOSE(3, verbose_stream() << mk_pp(atom, m) << "\n";);
ineq* c = alloc(ineq, literal(abv));
c->m_k = m_util.get_k(atom);
numeral& k = c->m_k;
@ -324,7 +381,9 @@ namespace smt {
}
c->unique();
lbool is_true = c->normalize();
c->prune();
literal lit(abv);
switch(is_true) {
case l_false:
@ -339,7 +398,9 @@ namespace smt {
break;
}
// TBD: special cases: args.size() == 1
// TBD: special cases: k == 1, or args.size() == 1
// maximal coefficient:
numeral& max_watch = c->m_max_watch;
@ -983,14 +1044,12 @@ namespace smt {
tout << "\n";
display(tout, c, true););
if ((c.m_num_propagations & 0xF) == 0) {
if (true || (c.m_num_propagations & 0xF) == 0) {
resolve_conflict(c);
}
justification* js = 0;
ctx.mk_clause(lits.size(), lits.c_ptr(), js, CLS_AUX_LEMMA, 0);
IF_VERBOSE(2, ctx.display_literals_verbose(verbose_stream(), lits.size(), lits.c_ptr());
verbose_stream() << "\n";);
}
@ -1031,7 +1090,7 @@ namespace smt {
if (ctx.get_assignment(l) != l_false) {
m_lemma.m_k -= coeff;
if (false && is_marked(v)) {
if (true && false && is_marked(v)) {
SASSERT(ctx.get_assignment(l) == l_true);
numeral& lcoeff = m_lemma.m_args[m_conseq_index[v]].second;
lcoeff -= coeff;
@ -1173,6 +1232,7 @@ namespace smt {
// It is not a correctness bug but causes to miss lemmas.
//
IF_VERBOSE(1, display_resolved_lemma(verbose_stream()););
TRACE("pb", display_resolved_lemma(tout););
return false;
}
@ -1254,11 +1314,15 @@ namespace smt {
}
display(tout << "=> ", m_lemma););
// 3x + 3y + z + u >= 4
// ~x /\ ~y => z + u >=
IF_VERBOSE(2, display(verbose_stream() << "lemma1: ", m_lemma););
hoist_maximal_values();
lbool is_true = m_lemma.normalize();
m_lemma.prune();
IF_VERBOSE(2, display(verbose_stream() << "lemma: ", m_lemma););
IF_VERBOSE(2, display(verbose_stream() << "lemma2: ", m_lemma););
switch(is_true) {
case l_true:
UNREACHABLE();
@ -1290,7 +1354,7 @@ namespace smt {
void theory_pb::hoist_maximal_values() {
for (unsigned i = 0; i < m_lemma.size(); ++i) {
if (m_lemma.coeff(i) == m_lemma.k()) {
if (m_lemma.coeff(i) >= m_lemma.k()) {
m_ineq_literals.push_back(~m_lemma.lit(i));
std::swap(m_lemma.m_args[i], m_lemma.m_args[m_lemma.size()-1]);
m_lemma.m_args.pop_back();

2
src/smt/theory_pb.h
View file

@ -92,6 +92,8 @@ namespace smt {
void unique();
void prune();
bool well_formed() const;
app_ref to_expr(context& ctx, ast_manager& m);