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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/88173] constant folding of NaN comparison depends on
 order of operands
Date: Tue, 08 Dec 2020 19:47:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88173

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|`std::numeric_limits<T>::qu |constant folding of NaN
                   |iet_NaN()` is not always    |comparison depends on order
                   |constexpr                   |of operands
          Component|c++                         |middle-end

--- Comment #11 from Jason Merrill <jason at gcc dot gnu.org> ---
Middle-end issue; the patterns in match.pd handle these equivalent comparis=
ons
very differently.=