[Bug tree-optimization/57066] [4.7/4.8/4.9 Regression] std::logb(-inf) returns wrong value

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57066



--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> 2013-04-25 
13:43:39 UTC ---

(In reply to comment #4)

> I wonder if std::logb(-NaN) should also return +NaN.



It turned out that in NaN's case it doesn't matter.