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This extension provides additional MPI datatypes MPIX_SHORT_FLOAT,
MPIX_C_SHORT_FLOAT_COMPLEX, and MPIX_CXX_SHORT_FLOAT_COMPLEX, which
are proposed with the MPI_ prefix in June 2017 for proposal in the
MPI 4.0 standard. As of February 2019, it is not accepted yet.
https://github.com/mpi-forum/mpi-issues/issues/65
Each MPI datatype corresponds to the C/C++ type 'short float', the C type
'short float _Complex', and the C++ type 'std::complex<short float>',
respectively.
In addition, this extension provides a datatype MPIX_C_FLOAT16 for
the C type _Float16, which is defined in ISO/IEC JTC 1/SC 22/WG 14
N1945 (ISO/IEC TS 18661-3:2015). This name and meaning are same as
that of MPICH.
https://github.com/pmodels/mpich/pull/3455
This extension is enabled only if the C compiler supports 'short float'
or '_Float16', or the '--enable-alt-short-float=TYPE' option is passed
to the configure script.
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