Underlying the front-end parsers is a symbolic instruction set – a kind of portable assembly code – which can be translated to any of the supported machine architectures.
因为前端解析器其实是符号化指令集，这种指令集实质上是一组可移植的汇编码，能够翻译到任何支持的机器架构之上。
Therefore, on most architectures, a find-first-bit-set instruction is used to find the highest priority bit set in one of five 32-bit words (for the 140 priorities).
因此，在大部分体系架构上，会使用一条find - first - bit - set指令在5个32位的字(140个优先级)中哪一位的优先级最高。
An ARM7 instruction set simulator is implemented for illustration, and the optimization techniques presented in this paper are also applicable for most other modern RISC architectures.
以arm 7指令集模拟器为实例，所提出的优化技术同样适用于其它现代RISC体系结构。
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