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SpacemiT K1/M1 Custom Extensions
I'm not sure if there's any interest in supporting the custom extensions found in this core.
https://github.com/space-mit/riscv-ime-extension-spec
the IME instruction set seems to only add a dot matrix product, with type of up to 16bits width. If it's just that,there is no use for this on SSE or AVX emulation.