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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/57066] [4.7/4.8/4.9 Regression] std::logb(-inf) returns wrong value
Date: Thu, 25 Apr 2013 13:43:00 -0000
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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.