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More simplifications rules for M.

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* src/ltlvisit/reduce.cc (reduce_visitor): Add the following
implication rewriting rules:
a M (b M c) = a M c if a implies b.
a M (b R c) = a M c if a implies b.
a R (b R c) = a R c if a implies b.
a R (b M c) = b M c if b implies a.
a M (b M c) = b M c if b implies a.
The latter rule was fixed from an incorrectly copied&pasted
rule for a M (b R c) = b R c if b implies a (this is wrong).
* src/ltltest/reduccmp.test: Add more tests.
This commit is contained in:
Alexandre Duret-Lutz 2010-04-15 13:01:21 +02:00
parent 946f305f7c
commit 1a91208933
3 changed files with 56 additions and 5 deletions
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35
src/ltlvisit/reduce.cc
View file

@ -201,9 +201,10 @@ namespace spot
return;
}
/* b < a => a R (b R c) = b R c */
/* b < a => a R (b M c) = b M c */
{
binop* bo = dynamic_cast<binop*>(f2);
if (bo && bo->op() == binop::R
if (bo && (bo->op() == binop::R || bo->op() == binop::M)
&& syntactic_implication(bo->first(), f1))
{
result_ = f2;
@ -211,6 +212,18 @@ namespace spot
return;
}
}
/* a < b => a R (b R c) = a R c */
{
binop* bo = dynamic_cast<binop*>(f2);
if (bo && bo->op() == binop::R
&& syntactic_implication(f1, bo->first()))
{
result_ = binop::instance(binop::R, f1,
bo->second()->clone());
f2->destroy();
return;
}
}
break;
case binop::W:
@ -229,11 +242,10 @@ namespace spot
f2->destroy();
return;
}
/* a < b => a W (b U c) = (b U c) */
/* a < b => a W (b W c) = (b W c) */
{
binop* bo = dynamic_cast<binop*>(f2);
if (bo && (bo->op() == binop::U || bo->op() == binop::W)
if (bo && bo->op() == binop::W
&& syntactic_implication(f1, bo->first()))
{
result_ = f2;
@ -259,10 +271,10 @@ namespace spot
f2->destroy();
return;
}
/* b < a => a R (b R c) = b R c */
/* b < a => a M (b M c) = b M c */
{
binop* bo = dynamic_cast<binop*>(f2);
if (bo && bo->op() == binop::R
if (bo && bo->op() == binop::M
&& syntactic_implication(bo->first(), f1))
{
result_ = f2;
@ -270,6 +282,19 @@ namespace spot
return;
}
}
/* a < b => a M (b M c) = a M c */
/* a < b => a M (b R c) = a M c */
{
binop* bo = dynamic_cast<binop*>(f2);
if (bo && (bo->op() == binop::M || bo->op() == binop::R)
&& syntactic_implication(f1, bo->first()))
{
result_ = binop::instance(binop::M, f1,
bo->second()->clone());
f2->destroy();
return;
}
}
break;
}
}