[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 #4 from Marek Polacek <mpolacek at gcc dot gnu.org> 2013-04-25 
11:47:34 UTC ---

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