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Remove all ops with 3 buffers #9867

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@bosilca bosilca commented Jan 12, 2022

We planned to remove support for all the MPI_Op with 3 buffer arguments, but this feature might be useful for the MPI extension described in mpi-forum/mpi-issues#530.

Full discussion in #9719.

the code.

Signed-off-by: George Bosilca <bosilca@icl.utk.edu>
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I think that we have established that nothing in the Open MPI code base is using this code. My $0.02 is that we should remove this therefore-stale code.

If mpi-forum/mpi-issues#530 ever makes it into an MPI standard (which will take a year or two), we can bring this code back.

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