6f282bd385
- ompi/mpi/fortran/use-mpi-f08/mod/mpi-f08-interfaces.h - ompi/mpiext/shortfloat/c/mpiext_shortfloat_c.h - ompi/mpiext/shortfloat/mpif-h/mpiext_shortfloat_mpifh.h - ompi/mpiext/shortfloat/use-mpi-f08/mpiext_shortfloat_usempif08.h Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>
Open MPI extension: shortfloat
Copyright (c) 2018 FUJITSU LIMITED. All rights reserved.
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.
See https://github.com/mpi-forum/mpi-issues/issues/65 for moe details
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. See 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 Open MPI configure script.
NOTE: The Clang 6.0.x and 7.0.x compilers support the _Float16 type
(via software emulation), but require an additional linker flag to
function properly. If you wish to enable Clang 6.0.x or 7.0.x's
software emulation of _Float16, use the following CLI options to Open
MPI configure script:
./configure \
LDFLAGS=--rtlib=compiler-rt \
--with-wrapper-ldflags=--rtlib=compiler-rt ...