Himelstein said that 48-bit instructions may be gathering steam in embedded computing. The RISC-V architecture is popular in controllers and embedded applications, which are largely 16-bit and 32-bit. Intel is also working with Barcelona Supercomputing Centre to develop a RISC-V high-performance chip, and is investing billions to make chips based on all major architectures including RISC-V. SiFive has developed its own RISC-V processor called the P650 which it has compared to Arm’s Cortex-77 chip. The instruction set is a common tissue on which compute cores – which could be for graphics, artificial intelligence, vector cryptography, etc.
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The RISC-V design is modular, meaning that companies can add or subtract modules depending on their requirements. RISC-V is an open-source instruction set architecture that companies can license for free and then modify to their own needs. But there are some members who are doing custom instructions that are 48-bit… and it is mostly driven by immediate values,” said Mark Himelstein, chief technology officer at RISC-V International. “RISC-V is not pushing any 48-bit instructions right now. The 48-bit long instructions focus is more as a middle ground between 32-bit and 64-bit, which has largely been the focus of chips and instruction sets until now.
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There’s a growing interest among silicon providers backing RISC-V to introduce 48-bit computing in custom chips to meet their specific requirements. Since 1987 - Covering the Fastest Computers in the World and the People Who Run Them