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Date: Fri, 06 May 2022 17:40:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105509

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
_Float16 was added for AVX512FP16 as a C++ extention.  The fN suffixes were
added by

https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommit;h=3Dc65699efcce48d68ef57ab3=
ce7fc5420fac5cbf9

which has

C++ note: no support for the new types or constant suffixes is added
for C++.  C++ decimal floating-point support was very different from
the C support, using class types, and the same may well apply to any
future C++ bindings for IEEE interchange and extended types.  There is
a case, however, for supporting at least *f128 constants in C++, so
that code using __float128 can use the newer style for constants
throughout rather than needing to use the older *q constants in C++.
Also, if built-in functions are added that may provide a way in which
the types could leak into C++ code.=