[cfe-dev] Implementation issues of fpclassify on clang (x86_64)

[TPoDT|Mr. eXoDia via cfe-dev]

Hello,

Sorry for the brief message, but the fpclassify function outputs various
incorrect results for the long double type in clang. See
https://sourceforge.net/p/mingw-w64/bugs/602 for more details and extensive
testing code.

Duncan
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