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Author SHA1 Message Date
Alexandre Duret-Lutz
b62e1bb13c simplify_acc: fix an infinite loop 
* spot/twaalgos/cleanacc.cc (fuse_mark_here): Fix incorrect cancelling
of n-ary subterms, causing an invalid acceptance condition, and then
an infinite loop.
* tests/python/simplacc.py: Add test case.
 2020-04-17 21:42:53 +02:00
Alexandre Duret-Lutz
8a4a4b9fff simplify_acceptance: fix erroneous simplification 
Reported by Florian Renkin.

* spot/twaalgos/cleanacc.cc: Do not rewrite
...Fin(0)&(Fin(1)|(Fin(3)&Inf(4)))... as Fin(0)&f when it appears that
{1,3} cannot receive {0}, because {1} is used elsewhere in the
acceptance.
* tests/python/simplacc.py: Add test case.
 2020-02-24 12:17:07 +01:00
Alexandre Duret-Lutz
50c0f880dc Inf(i)|Inf(j) -> Inf(k) and Fin(i)&Fin(j) -> Fin(k) 
Implement those rules in simplify_acceptance_here().

* NEWS: Mention the change.
* spot/twa/acc.cc,
spot/twa/acc.hh (acc_cond::acc_code::used_once_sets): New method.
* spot/twaalgos/cleanacc.cc, spot/twaalgos/cleanacc.hh:
Implement the above rule.
* tests/core/remfin.test: Adjust expected results.
* tests/python/simplacc.py: New file.
* tests/Makefile.am: Add it.
 2020-01-28 09:37:28 +01:00