传统微处理 器体系结构通过开发指令级并行性（ILP）来提高性能。超标量技术（Superscalar）和超长 指令字（VeryLarge InstructionWord）是目前比较成熟的两种开发ILP技术［1】。
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软件流水是一种开发循环程序指令级并行性的技术，它通过并行执行连续的多个迭代来加快循环的执行速度。
Software pipelining is a loop scheduling technique which extracts instruction level parallelism by overlapping the execution of several consecutive iterations.
多年来，处理器制造厂商在不断提高时钟速度和指令级并行性，因此单线程代码不需要修改就可在新的处理器上更快运行。
For years, processor makers consistently delivered increases in clock rates and instruction-level parallelism, so that single-threaded code executed faster on newer processors with no modification.
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