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Xilinx / ACCL

Alveo Collective Communication Library: MPI-like communication operations for Xilinx Alveo accelerators
https://accl.readthedocs.io/
Apache License 2.0
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Fix word slicing in HLS test #157

Closed bo3z closed 1 year ago

bo3z commented 1 year ago

In the HLS example, word slicing is done like LSB...MSB, when, the correct way would be MSB...LSB. This will not cause any compile-time issues, but, can sometimes cause incorrect behaviour (e.g. summing words). An example of this is shown in this branch with REDUCE-SUM.

Proposing this PR for any users using the HLS test example as a baseline for their applications, as it is quite a niche bug once in the code.

quetric commented 1 year ago

Thanks @bo3z - Is there a corresponding test which needs to be updated as a result of this change to the HLS?

bo3z commented 1 year ago

Thanks @bo3z - Is there a corresponding test which needs to be updated as a result of this change to the HLS?

No, in VADD, the words are streamed, so as long as they are read/written in the same manner, there will be no bugs. Problems only occur with arithmetic.

In general, however, I think it might be worth adding a few more examples/tests for PL-PL communication, maybe similar to the FPGA'23 tutorial or the above-mentioned REDUCE-SUM.