What is the difference between risc-v architecture and arm?

Difference: ARM is a closed instruction set architecture. The architecture document is thousands of pages long. The number of instructions is complex and there are many versions. They are neither compatible with each other nor support modularity; [RISC-V 】 is a completely open source architecture. The architecture document is only more than 200 pages, and the number of basic instructions is only more than 40. At the same time, a set of instruction sets supports all architectures and supports modularization.

The operating environment of this article: Windows 7 system, Dell G3 computer.

Starting in the summer of 2010, the Berkeley research team spent approximately four years designing and developing a complete new instruction set. This new instruction set is called RISC-V. The instruction set has been questioned by many parties since its official release in 2014. By 2017, the Indian government stated that it would vigorously fund RISC-V-based processor projects, making RISC-V the first choice in India. De facto national directive set. This year, China has supported RISC-V from the national policy level, and Shanghai has become the first city in China to include RISC-V as a target of government support. RISC- V camp.

After just a few years, RISC-V not only has policy support, but the attention of enterprises and academic circles to this open source instruction set continues to increase, and even Arm is feeling the pressure. Since RISC-V was born at Berkeley University in 2010, one of the most common voices in the industry is that RISC-V may change the existing competitive landscape of processor architectures dominated by Arm and Intel , IOT and other embedded markets have had an impact.

The difference between ARM and RISC-V

Both the ARM architecture and the RISC-V architecture are derived from the reduced instruction computer RISC in the 1980s. The biggest difference between the two lies in the simple technical style and completely open model they admire.

ARM is a closed instruction set architecture. Many manufacturers that only use the ARM architecture can only adjust product frequency and power consumption according to their own needs, and are not allowed to change the original design. After decades of development and evolution , the CPU architecture has become extremely complex and verbose. The ARM architecture documents are thousands of pages long, the number of instructions is complex, and there are many versions. They are neither compatible with each other nor support modularization, and there are expensive patent and architecture licensing issues.

Looking back at RISC-V, from the beginning of its design, it was positioned as a completely open source architecture, avoiding the detours of decades of development of computer systems. The architecture document is only more than 200 pages, and the number of basic instructions is only There are more than 40 instructions, and one instruction set supports all architectures. The modularity allows users to freely customize and configure different instruction subsets according to their needs.

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