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Perform WDBA minimization before degeneralization.

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There is no point in degeneralizing an automaton if it can be WDBA
minimized.  Doing so will only augment the number of states and
slow down the powerset construction used by the WDBA minimization.

* src/tgbatest/babiak.test: New file.  It includes 5 formulae
which Tomáš Babiak reported Spot 0.7.1 would take over one hour to
translate if degeneralization and WDBA minimization were both
requested.
* src/tgbatest/Makefile.am (TESTS): Add it.
* src/tgbatest/ltl2tgba.cc: Do WDBA minimization before
degeneralization.  The above formulae are now all translated in a
few seconds.
This commit is contained in:
Alexandre Duret-Lutz 2011-12-16 12:56:22 +01:00
parent 9679032510
commit e531da8d92
4 changed files with 160 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

48
src/tgbatest/ltl2tgba.cc
View file

@ -934,27 +934,6 @@ main(int argc, char** argv)
const spot::tgba_tba_proxy* degeneralized = 0;
const spot::tgba_sgba_proxy* state_labeled = 0;
unsigned int n_acc = a->number_of_acceptance_conditions();
if (echeck_inst
&& degeneralize_opt == NoDegen
&& n_acc > 1
&& echeck_inst->max_acceptance_conditions() < n_acc)
degeneralize_opt = DegenTBA;
if (degeneralize_opt == DegenTBA)
{
a = degeneralized = new spot::tgba_tba_proxy(a);
}
else if (degeneralize_opt == DegenSBA)
{
a = degeneralized = new spot::tgba_sba_proxy(a);
assume_sba = true;
}
else if (labeling_opt == StateLabeled)
{
a = state_labeled = new spot::tgba_sgba_proxy(a);
}
const spot::tgba* minimized = 0;
if (opt_minimize)
{
@ -983,6 +962,33 @@ main(int argc, char** argv)
}
}
unsigned int n_acc = a->number_of_acceptance_conditions();
if (echeck_inst
&& degeneralize_opt == NoDegen
&& n_acc > 1
&& echeck_inst->max_acceptance_conditions() < n_acc)
{
degeneralize_opt = DegenTBA;
assume_sba = false;
}
if (!assume_sba && !opt_monitor)
{
if (degeneralize_opt == DegenTBA)
{
a = degeneralized = new spot::tgba_tba_proxy(a);
}
else if (degeneralize_opt == DegenSBA)
{
a = degeneralized = new spot::tgba_sba_proxy(a);
assume_sba = true;
}
else if (labeling_opt == StateLabeled)
{
a = state_labeled = new spot::tgba_sgba_proxy(a);
}
}
if (opt_monitor)
{
tm.start("Monitor minimization");