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stats: speed up the computation of transitions

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Juraj Major reported a case with 32 APs where ltlcross would take
forever to gather statistics.  It turns out that for each edge,
twa_sub_statistics was enumerating all compatible assignments of 32
APs.  This uses bdd_satcountset() instead, and also store the result
in a long long to avoid overflows.

* spot/twaalgos/stats.cc (twa_sub_statistics): Improve the code for
counting transitions.
* bin/common_aoutput.hh, bin/ltlcross.cc, spot/twaalgos/stats.hh:
Store transition counts are long long.
* tests/core/readsave.test: Add test case.
* NEWS: Mention the bug.
This commit is contained in:
Alexandre Duret-Lutz 2020-05-18 16:52:31 +02:00
parent 4608d9a5b1
commit d25fcb23eb
6 changed files with 45 additions and 21 deletions
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2
bin/ltlcross.cc
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@ -296,7 +296,7 @@ struct statistics
double time;
unsigned states;
unsigned edges;
unsigned transitions;
unsigned long long transitions;
unsigned acc;
unsigned scc;
unsigned nonacc_scc;