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* spot/twaalgos/postproc.cc: Improve to_parity() call.

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This commit is contained in:
Alexandre Duret-Lutz 2020-04-15 11:41:46 +02:00
parent d7ab8dbe13
commit 801d629a20
1 changed files with 18 additions and 15 deletions
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33
spot/twaalgos/postproc.cc
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@ -1,5 +1,5 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2012-2019 Laboratoire de Recherche et Développement
// Copyright (C) 2012-2020 Laboratoire de Recherche et Développement
// de l'Epita (LRDE).
//
// This file is part of Spot, a model checking library.
@ -274,22 +274,25 @@ namespace spot
!(type_ == Generic && PREF_ == Any && level_ == Low))
a = remove_alternation(a);
if ((via_gba && !a->acc().is_generalized_buchi())
|| (want_parity && !a->acc().is_parity()))
if ((via_gba || (want_parity && !a->acc().is_parity()))
&& !a->acc().is_generalized_buchi())
{
twa_graph_ptr b = nullptr;
if (want_parity && is_deterministic(a) &&
!a->acc().is_generalized_buchi())
b = to_parity(a);
// possible only if a was deterministic and (Rabin-like or Streett-like)
// and we want parity and a is not a TGBA
// NB: on a TGBA, degeneralization is better than IAR
if (b)
a = b;
// If we do want a parity automaton, we can use to_parity().
// However (1) degeneralization is better if the input is
// GBA, and (2) if we want a deterministic parity automaton and the
// input is not deterministic, that is useless here. We need
// to determinize it first, and our deterministization
// function only deal with TGBA as input.
if (want_parity && (PREF_ != Deterministic || is_deterministic(a)))
{
a = to_parity(a);
}
else
a = to_generalized_buchi(a);
if (PREF_ == Any && level_ == Low)
a = do_scc_filter(a, true);
{
a = to_generalized_buchi(a);
if (PREF_ == Any && level_ == Low)
a = do_scc_filter(a, true);
}
}
if (PREF_ == Any && level_ == Low