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genem: improve the worst case

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* spot/twaalgos/genem.cc, spot/twaalgos/genem.hh: Improve the worst
case by not recurring twice into each disjunct individually.  Keep
the previous two implementation available and add a function
generic_emptiness_check_select_version() so we can benchmark the
difference.
* tests/python/genem.py: Test the three versions.
This commit is contained in:
Alexandre Duret-Lutz 2020-03-06 09:56:16 +01:00
parent 73277bed96
commit 7f0ef7ad59
3 changed files with 100 additions and 28 deletions
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21
spot/twaalgos/genem.hh
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@ -1,5 +1,5 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2017-2019 Laboratoire de Recherche et Developpement
// Copyright (C) 2017-2020 Laboratoire de Recherche et Developpement
// de l'Epita (LRDE).
//
// This file is part of Spot, a model checking library.
@ -61,4 +61,23 @@ namespace spot
SPOT_API bool
generic_emptiness_check_for_scc(const scc_info& si, unsigned scc,
const acc_cond& forced_acc);
/// \ingroup emptiness_check_algorithms
///
/// Select the version of the generic-emptiness check to use, this
/// is mainly for benchmarking purpose.
///
/// We currently have three versions:
/// - "spot28" is similar to the algorithm described our ATVA'19 paper
/// \cite baier.19.atva , however it has an implementation bug
/// that cause superfluous recursive calls to be performed (the
/// result is still correct.
/// - "atva19" is similar to the algorithm described our ATVA'19 paper
/// \cite baier.19.atva , with the above bug fixed.
/// - "spot29" improves upon the worst case of atva19. This is
/// the default.
SPOT_API void
generic_emptiness_check_select_version(const char* emversion = nullptr);
}