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new conversion for Streett->GBA

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* src/twaalgos/totgba.hh, src/twaalgos/totgba.cc: Implement
the new function.
* NEWS: Mention this new function.
* src/bin/man/spot-x.x: Document SPOT_STREETT_CONV_MIN.
* src/tests/ltl2dstar4.test: Add tests.
* src/tests/Makefile.am: Add it.
* src/bin/autfilt.cc: Do do call remove_fin explicitely
when --tgba is used, let the postprocessor do it.
* src/twa/acc.hh: Add shift operators for acceptance marks.
* src/twaalgos/remfin.cc: Use the new algorithm.
* src/twaalgos/sccinfo.cc, src/twaalgos/sccinfo.hh: Add
a new method to supply the acceptance sets visited by an SCC.
This commit is contained in:
Alexandre Duret-Lutz 2015-07-10 19:02:21 +02:00
parent c0ffe5cdff
commit d8a1dafad1
11 changed files with 419 additions and 11 deletions
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44
src/bin/man/spot-x.x
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@ -39,16 +39,40 @@ user time for solving the SAT problem, system time for solving the SAT
problem.
.TP
\fBSPOT_SATSOLVER\fR If set, this variable should indicate how to call
a SAT\-solver. This is used by the sat\-minimize option described
above. The default value is \f(CW"glucose -verb=0 -model %I >%O"\fR,
it is correct for glucose version 3.0 (for older versions, remove the
\fCW(-model\fR option). The escape sequences \f(CW%I\fR and
\f(CW%O\fR respectively denote the names of the input and output
files. These temporary files are created in the directory specified
by \fBSPOT_TMPDIR\fR or \fBTMPDIR\fR (see below). The SAT-solver
should follow the convention of the SAT Competition for its input and
output format.
\fBSPOT_SATSOLVER\fR
If set, this variable should indicate how to call a SAT\-solver. This
is used by the sat\-minimize option described above. The default
value is \f(CW"glucose -verb=0 -model %I >%O"\fR, it is correct for
glucose version 3.0 (for older versions, remove the \fCW(-model\fR
option). The escape sequences \f(CW%I\fR and \f(CW%O\fR respectively
denote the names of the input and output files. These temporary files
are created in the directory specified by \fBSPOT_TMPDIR\fR or
\fBTMPDIR\fR (see below). The SAT-solver should follow the convention
of the SAT Competition for its input and output format.
.TP
\fBSPOT_STREETT_CONV_MIN\fR
The number of Streett pairs above which conversion from Streett
acceptance to generalized-Büchi acceptance should be made with a
dedicated algorithm. By default this is 3, i.e., if a Streett
automaton with 3 acceptance pairs or more has to be converted into
generalized-Büchi, the dedicated algorithm is used. This algorithm is
close to the classical conversion from Streett to Büchi, but with
several tweaks. When this algorithm is not used, the standard
"Fin-removal" approach is used instead: first the acceptance condition
is converted into disjunctive normal form (DNF), then Fin acceptance
is removed like for Rabin automata, yielding a disjuction of
generalized Büchi acceptance, and the result is finally converted into
conjunctive normal form (CNF) to obtain a generalized Büchi
acceptance. Both algorithms have a worst-case size that is
exponential in the number of Streett pairs, but in practice the
dedicated algorithm works better for most Streett automata with 3 or
more pairs (and many 2-pair Streett automata as well, but the
difference here is less clear). Setting this variable to 0 will
disable the dedicated algorithm. Setting it to 1 will enable it for
all Streett automata, however we do not recommand setting it to less
than 2, because the "Fin-removal" approach is better for single-pair
Streett automata.
.TP
\fBSPOT_TMPDIR\fR, \fBTMPDIR\fR