Fortran REAL16: improve detection and wiring across OMPI/OPAL #13612
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Minor nit-pick. Can we document in the code why we pick the order the way it is?
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Which order ? During configure or in the header files ? |
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@bosilca Getting an mpi4py floating point exception in CI. Can you investigate? |
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this doesn't fix the issue reported in issue #13564 |
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Check first for _Float128 then __float128 and then for _Quad type (Intel compiler) and pick the one that matches the Fortran REAL16 type. This commit adds support for pack, unpack as well as MPI_Op. As of today, no hardware support (AVX* or SVE) exists for the 128 bits floating point, so the only valid MPI_Op for this type is the base op (provided in software by most recent compilers). Signed-off-by: George Bosilca <[email protected]>
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Probe REAL*16 against _Float128 first, then __float128, and finally _Quad (Intel) to find a C type with matching bit representation. Ensure OPAL’s FLOAT12/FLOAT16 constructors are always available and map OMPI/MPI REAL16 based on architecture/language specifics.
Wire FLOAT128 types through copy/pack/unpack paths and hook REAL16 into the base MPI_Op table. This enables software-only reductions for REAL16 for as long as the Fortran type has a C equivalent.
Fixes #13564