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minimize_wdba() failed to fully minimize some automata.

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* src/tgbaalgos/minimize.cc (minimize_wdba): Fix the Löding
algorithm to use colors.  The previous implementation was an
incorrect approximation.
* src/tgbatest/wdba2.test: New file showing two equivalent
formulas that were minimized in automata with different sizes.
* src/tgbatest/Makefile.am: Add it.
This commit is contained in:
Alexandre Duret-Lutz 2012-01-17 12:11:33 +01:00
parent 2952daf0ba
commit a5787937ef
5 changed files with 103 additions and 50 deletions
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@ -3,6 +3,8 @@ New in spot 0.8.1a:
* Bug fixes:
- spot::ltl::length() forgot to count the '&' and '|' operators
in an LTL formula.
- minimize_wdba() could fail to mark some transiant SCCs as accepting,
producing an automaton that was not fully minimized.
- minimize_dfa() could produce incorrect automata, but it's not
clear whether this could have had an inpact on WDBA minimization
(the worse case is that some TGBA would not have been minimized