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Xtensa LX处理器采用了Tensilica独创的可变长度指令扩展FLIX(Flexible Length Instruction eXtensions)体系结构,该体系结构是Xtensa指令集体系结构ISA的高效实现,它给设计人员以更多的选择去对系统设计的成本和性能进行折衷。FLIX技术为设计人员提供了灵活的方法,将单操作RISC指令、简单和复合操作TIE指令以及多操作FLIX指令自由地结合在一起。通过将多个操作封装在一个32位或者64位的宽指令字中,FLIX技术可以允许设计人员加速执行嵌入式应用程序中比较主要的“热点”代码,同时消除了超长指令字VLIW处理器体系结构中指令代码和系统性能方面的缺陷。
The Xtensa LX processor incorporates Tensilica’s original Flexible Length Instruction eXtensions (FLIX) architecture, an efficient implementation of the Xtensa instruction set architecture ISA that gives designers more choices for the system The trade-off between design cost and performance. FLIX technology gives designers a flexible way to freely combine single-action RISC instructions, simple and compound-operation TIE instructions, and multi-operation FLIX instructions. By packaging multiple operations in a 32-bit or 64-bit wide instruction word, FLIX technology allows designers to speed up execution of the more important “hot” code in embedded applications while eliminating the need for very long instruction words VLIW processor Defects in the instruction code and system performance in the architecture.