[MLAS] Plan to add RISC-V Vector (RVV) support to MLAS

[qiujiandong]

Hi ONNX Runtime team,

First of all, thank you for the excellent work on ONNX Runtime — it’s a powerful and well-engineered framework.

I’m an engineer from Nuclei System Technology, and I’m currently working on extending MLAS to support the RISC-V Vector (RVV) extension.

Here is a brief overview of my development plan:

• The implementation will follow the RVV v0.12.0 specification.

• I will use the GCC trunk toolchain, which includes support for RVV.

• I will ensure that the onnxruntime_mlas_test suite passes successfully with the changes.

• I will evaluate performance using onnxruntime_mlas_benchmark, and aim to achieve measurable improvements with RVV optimization enabled.

• I also plan to contribute documentation describing the implementation and usage.

• The development is currently ongoing on my branch. Once it's ready, I will open a pull request for review.

• Additionally, I’ve initiated a separate discussion on NaN propagation related to MLAS behavior. I would appreciate it if anyone interested could take a look and share their thoughts.

If there are any guidelines, preferences, or prerequisites for contributing to MLAS, I’d appreciate any advice you can provide in advance. I'm happy to iterate on the implementation to align with the project's expectations.

[github-actions]

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