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simplifier: add two new rules

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Fixes #354.

* spot/tl/simplify.cc: Implement the rules.
* doc/tl/tl.tex, NEWS: Document them.
* tests/core/reduccmp.test: Add tests.
* tests/core/det.test, tests/core/satmin.test: Adjust.
This commit is contained in:
Alexandre Duret-Lutz 2018-06-04 13:49:40 +02:00
parent 8e3b982985
commit ca1c67a73d
6 changed files with 51 additions and 29 deletions
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11
spot/tl/simplify.cc
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@ -1682,8 +1682,19 @@ namespace spot
if (a.is_universal() && bo.is(op::W))
return recurse(formula::Or({a, b}));
// (q R Xf) = X(q R f)
// (q U Xf) = X(q U f)
if (a.is_eventual() && a.is_universal()
&& bo.is(op::R, op::U) && b.is(op::X))
return recurse(formula::X(formula::binop(o, a, b[0])));
// e₁ W e₂ = Ge₁ | e₂
// u₁ M u₂ = Fu₁ & u₂
//
// The above formulas are actually true if e₁ and u₁ are
// unconstrained, however there are many cases were such a
// more generic reduction rule will actually produce more
// states once the resulting formula is translated.
if (!opt_.reduce_size_strictly)
{
if (bo.is(op::W) && a.is_eventual() && b.is_eventual())