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* src/tgba/succiterconcrete.cc (tgba_succ_iterator_concrete::next):

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Fix so that !p.!Acc[g].Acc[f] + p.!Acc[g].Acc[f] + p.Acc[g].!Acc[f]
is factored as !p.!Acc[g].Acc[f] + p.(!Acc[g].Acc[f] + Acc[g].!Acc[f]),
not !Acc[g].Acc[f] + p.Acc[g].!Acc[f].
This commit is contained in:
Alexandre Duret-Lutz 2003-07-10 11:56:03 +00:00
parent bbba8ca966
commit 977d389724
2 changed files with 22 additions and 3 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2003-07-10 Alexandre Duret-Lutz <aduret@src.lip6.fr>
* src/tgba/succiterconcrete.cc (tgba_succ_iterator_concrete::next):
Fix so that !p.!Acc[g].Acc[f] + p.!Acc[g].Acc[f] + p.Acc[g].!Acc[f]
is factored as !p.!Acc[g].Acc[f] + p.(!Acc[g].Acc[f] + Acc[g].!Acc[f]),
not !Acc[g].Acc[f] + p.Acc[g].!Acc[f].
2003-07-09 Alexandre Duret-Lutz <aduret@src.lip6.fr>
* lbtt/: New directory. Contains a patched version of lbtt 1.0.1.

18
src/tgba/succiterconcrete.cc
View file

@ -102,15 +102,27 @@ namespace spot
current_acc_ = bdd_forall(bdd_restrict(as, prop), data_.var_set);
// current_acc_ = (Acc[a] | Acc[b])
assert(current_acc_ != bddfalse);
// Find other transitions included in each of these
// accepting sets.
// Find other transitions included exactly in each of these
// accepting sets and are not included in other sets.
// Consider
// !p.!Acc[g].Acc[f] + p.!Acc[g].Acc[f] + p.Acc[g].!Acc[f]
// if current_acc_ = !Acc[g].Acc[f] we
// want to compute !p, not (!p + p), because p really
// belongs to !Acc[g].Acc[f] + Acc[g].!Acc[f], not
// only !Acc[g].Acc[f].
// So, first, filter out all transitions like p, which
// are also in other accepting sets.
bdd fout = bdd_relprod(as, !current_acc_, data_.acc_set);
bdd as_fout = as & !fout;
// Then, pick the remaining term that are exactly in all
// required accepting sets.
bdd all = bddtrue;
bdd acc = current_acc_;
do
{
bdd one_acc = bdd_satone(acc);
acc &= !one_acc;
all &= bdd_relprod(as, one_acc, data_.acc_set);
all &= bdd_relprod(as_fout, one_acc, data_.acc_set);
}
while (acc != bddfalse);
// all = (a | (!a)&b) & (Acc[a] | Acc[b])