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degen: add a lowinit option

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* src/tgbaalgos/degen.cc, src/tgbaalgos/degen.hh: New argument
to disable the "jump to the accepting level if the entering
state as an accepting self-loop" optimization.
* src/tgbaalgos/postproc.cc, src/tgbaalgos/postproc.hh: Check
the degen-lowinit option and pass it on to degeneralize().
* src/bin/spot-x.cc: Document it.
* src/tgbatest/degenlskip.test: Add some tests.
* src/tgbatest/ltl2ta.test: Update value.  We output less
accepting states now.
This commit is contained in:
Alexandre Duret-Lutz 2015-04-01 16:25:23 +02:00
parent 6e8170e386
commit 7bb183b929
7 changed files with 149 additions and 82 deletions
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6
src/bin/spot-x.cc
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@ -83,6 +83,12 @@ states. A consequence of skipping levels is that the degeneralized \
automaton tends to have smaller cycles around the accepting states. \
Disabling skipping will produce automata with large cycles, and often \
with more states.") },
{ DOC("degen-lowinit", "Whenever the degeneralization algorihm enters \
a new SCC (or starts from the initial states), it starts on a level that \
is compatible with all outgoing transitions. If degen-lowinit is zero \
(the default) and the corresponding state (in the generalized automaton) \
has an accepting self-loop, then the level is set to the accepting \
level, as it might favor finding accepting cycles earlier.") },
{ DOC("simul", "Set to 0 to disable simulation-based reductions. \
Set to 1 to use only direct simulation. Set to 2 to use only reverse \
simulation. Set to 3 to iterate both direct and reverse simulations. \