LoongArch includes a reduced 32-bit version (LA32R), a standard 32-bit version (LA32S) and a 64-bit version (LA64)". A Loongson developer described it as ".a new RISC ISA, which is a bit like MIPS or RISC-V. Loongson moved to their own processor instruction set architecture (ISA) in 2021 with the release of the Loongseries. The new instructions help a QEMU hypervisor translate instructions from x86 to MIPS with only a reported 30% performance penalty.
The binary translation instructions have the specific benefit of speeding up Intel x86 CPU emulation at a cost of 5% of the total die area. The LoongISA instructions were introduced as part of the GS464E cores.
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STMicroelectronics bought a MIPS license for Loongson, and thus the processor can be promoted as MIPS-based or MIPS-compatible instead of MIPS-like. In 2007, a deal was reached by MIPS Technologies and ICT. Early implementations of the family lacked four instructions patented by MIPS Technologies (US4814976A, unaligned load-store) to avoid legal issues. The internal microarchitecture was independently developed by ICT. Loongson began by using the MIPS64 instruction set architecture (ISA). In March 2023, the United States Department of Commerce added Loongson to the Bureau of Industry and Security's Entity List for acquisition of American technology to support the People's Liberation Army (PLA). sanctions įurther information: United States sanctions against China and Military-civil fusion Details from this time suggested Loongson needing RMB 400,000,000 annual funding, for the first 10 years of its existence, and the company only broke even in 2015. The company was seeking to raise US$500 million. In 2021, Loongson filed for an initial public offering on the Shanghai Stock Exchange STAR Market. The South China Morning Post reported that since 2020, Loongson has partnered with UnionTech and Sunway to develop and promote the Debian Linux-based Deepin operating system to reduce Chinese computers dependency on Microsoft Windows. As Loongson is a fabless designer, STMicroelectronics fabricates and markets the processors. BLX itself was a spin-off from ICT, and was founded in 2002 with Jiangsu Zhongyi Group. The company is a public–private partnership between ICT and Beijing-based chip designer BLX IC Design Corporation. In 2010 the company was commercialised as a separate entity, and in April 2010 Loongson Technology Corporation Limited was formally established and settled in Zhongguancun, Beijing, China. The development was supported by funding via the 10th and 11th Five-Year Plans. The aim of the Godson project was to develop "high performance general-purpose microprocessors in China", and to become technologically self-sufficient as part of the Made in China 2025 plan. The development of the first Loongson chip was started in 2001. The Godson processors, based on MIPS architecture, were initially developed at the Institute of Computing Technology (ICT), Chinese Academy of Sciences (CAS). The processors are alternately called Godson processors, which are described as its academic name. 'Dragon Core') is the name of a family of general-purpose, MIPS architecture-compatible microprocessors, as well as the name of the Chinese fabless company ( Loongson Technology) that develops them. Loongson ( simplified Chinese: 龙芯 traditional Chinese: 龍芯 pinyin: Lóngxīn lit.
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