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Those SiFive extensions have been published on the web for a while, and we plan to implement intrinsics in GCC for those instructions soon. NOTE: The original patch was written by Nelson when he was still working at SiFive, and Kito rebased it to the trunk. Therefore, I kept the author as Nelson with his SiFive email. Document links: xsfvqmaccdod: https://www.sifive.com/document-file/sifive-int8-matrix-multiplication-extensions-specification xsfvqmaccqoq: https://www.sifive.com/document-file/sifive-int8-matrix-multiplication-extensions-specification xsfvfnrclipxfqf: https://www.sifive.com/document-file/fp32-to-int8-ranged-clip-instructions Co-authored-by: Kito Cheng <kito.cheng@sifive.com>