Support half with MPI #172
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This adds support for half to the MPI and Host-Transfer backends, and support for testing half datatypes across all backends.
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This adds support for half to the MPI and Host-Transfer backends, and support for testing half datatypes across all backends.
Note that CPU-side half computations are emulated with fp32. They are therefore slower and may not round in the same way as performing native fp16 operations.
This requires half support to be provided. Currently this is via either the HIP/ROCm or CUDA support. In the future we may support other sources for half.
Closes #171. Closes #104.