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RISC-V (pronounced “risk-five”) stands for ‘reduced instruction set computer (RISC) five’. The number five refers to the number of generations of RISC architecture that were developed at the University of California, Berkeley since 1981.

The RISC concept (like the parallel MIPS development in Stanford University) was motivated by the fact that most processor instructions were not used by most computer programs. Thus, unnecessary decoding logic was being used in processor designs, consuming unnecessary power and silicon area. The alternative was to simplify the instruction set and to invest more in register resources.

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