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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/64497] std::scalbln does not round correctly for long doubles
Date: Mon, 05 Jan 2015 14:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64497

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Looking at the C standard, it seems that the result is implementation-defined
on underflow, and zero is a valid result. C++ doesn't change that.