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sat: implement partial symmetry breaking

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Thanks to Rüdiger Ehlers for his helpful email.

* src/tgbaalgos/dtbasat.cc, src/tgbaalgos/dtgbasat.cc: Here.
This commit is contained in:
Alexandre Duret-Lutz 2013-08-29 17:10:07 +02:00
parent 9cfe1a3496
commit e9f60df857
2 changed files with 70 additions and 27 deletions
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44
src/tgbaalgos/dtgbasat.cc
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@ -477,6 +477,17 @@ namespace spot
sm.build_map();
bdd ap = sm.aprec_set_of(sm.initial());
// Count the number of atomic propositions
int nap = 0;
{
bdd cur = ap;
while (cur != bddtrue)
{
++nap;
cur = bdd_high(cur);
}
nap = 1 << nap;
}
// Number all the SAT variable we may need.
{
@ -485,12 +496,6 @@ namespace spot
ref_size = f.size();
}
#if DEBUG
debug_dict = ref->get_dict();
dout << "ref_size: " << ref_size << "\n";
dout << "cand_size: " << d.cand_size << "\n";
#endif
// empty automaton is impossible
if (d.cand_size == 0)
{
@ -501,6 +506,33 @@ namespace spot
// An empty line for the header
out << " \n";
#if DEBUG
debug_dict = ref->get_dict();
dout << "ref_size: " << ref_size << "\n";
dout << "cand_size: " << d.cand_size << "\n";
#endif
dout << "symmetry-breaking clauses\n";
int j = 0;
bdd all = bddtrue;
while (all != bddfalse)
{
bdd s = bdd_satoneset(all, ap, bddfalse);
all -= s;
for (int i = 1; i < d.cand_size; ++i)
for (int k = (i - 1) * nap + j + 3; k <= d.cand_size; ++k)
{
transition t(i, s, k);
int ti = d.transid[t];
dout << "¬" << t << "\n";
out << -ti << " 0\n";
++nclauses;
}
++j;
}
if (!nclauses)
dout << "(none)\n";
dout << "(8) the candidate automaton is complete\n";
for (int q1 = 1; q1 <= d.cand_size; ++q1)
{