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Re:Nyuzi – An Experimental Open-Source FPGA GPGPU Processor by jecel on Monday February 15, 2021 @09:34AM (#26143080)
See this report about the origin of each basic RISC-V instruction:

https://riscv.org/technical/specifications/risc-v-genealogy/

Of course, the various extensions might violate current patents (I would guess that packed SIMD and cryptography extensions are particularly at risk). But the basic ISA does not use anything that was not already widely adopted by 2003.

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