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Improve a reduction rule for "a M b".

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* src/ltlvisit/reduce.cc (reduce_visitor): Always reduce "a M b"
to "a & b" if "a" is a pure eventual formula, remove the
constraint on "b".
* src/ltltest/reduccmp.test: Add two tests.
This commit is contained in:
Alexandre Duret-Lutz 2011-03-17 11:55:56 +01:00
parent b51b7ab8b9
commit 1878bfd0fc
3 changed files with 18 additions and 5 deletions
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6
src/ltlvisit/reduce.cc
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@ -1,4 +1,4 @@
// Copyright (C) 2008, 2009, 2010 Laboratoire de Recherche et
// Copyright (C) 2008, 2009, 2010, 2011 Laboratoire de Recherche et
// Développement de l'Epita (LRDE).
// Copyright (C) 2004, 2006, 2007 Laboratoire d'Informatique de
// Paris 6 (LIP6), département Systèmes Répartis Coopératifs (SRC),
@ -285,9 +285,9 @@ namespace spot
eu_info f1i = { recurse_eu(f1) };
if (opt_ & Reduce_Eventuality_And_Universality)
{
/* If a&b is a pure eventuality formula then a M b = a & b.
/* If a is a pure eventuality formula then a M b = a & b.
If a is a pure universality formula a W b = a|b. */
if (f1i.is.eventual && f2i.is.eventual && (op == binop::M))
if (f1i.is.eventual && (op == binop::M))
{
result_ = multop::instance(multop::And, f1, f2);
return;