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degen: detect superfluous SCCs and remove them

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Suggested by Maximilien Colange.

* spot/twaalgos/degen.cc: If the output has more SCC than the input,
detect useless SCCs and remove them.
* spot/twaalgos/postproc.cc, spot/twaalgos/postproc.hh,
spot/twaalgos/degen.hh: Add support for a degen-remscc option.
* bin/spot-x.cc, NEWS: Document it.
* tests/core/degenscc.test: New file.
* tests/Makefile.am: Add it.
* tests/core/det.test: Lower some expected size (yay!).
This commit is contained in:
Alexandre Duret-Lutz 2017-09-28 21:54:49 +02:00
parent ce5e3b654f
commit 900b344c9a
9 changed files with 147 additions and 22 deletions
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bin/spot-x.cc
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@ -91,6 +91,9 @@ has an accepting self-loop, then level L is replaced by the accepting \
level, as it might favor finding accepting cycles earlier. If \
degen-lowinit is non-zero, then level L is always used without looking \
for the presence of an accepting self-loop.") },
{ DOC("degen-remscc", "If non-zero (the default), make sure the output \
of the degenalization has as many SCCs as the input, by removing superfluous \
ones.") },
{ DOC("det-scc", "Set to 0 to disable scc-based optimizations in \
the determinization algorithm.") },
{ DOC("det-simul", "Set to 0 to disable simulation-based optimizations in \