编译器中的edge profiling设计和实现

1.简介这篇论文是在从事ORC(Open Research Compiler)编译器的过程中完成的。ORC是中科院计算所同Intel公司的合作项目,为Intel的新一代64位芯片开发开放源代码的先进编译器。ORC的实现目标:为研究机构和团体提供一个可靠稳定的、开放源代码的编译基础结构,方便其在ORC的基础上进行编译器和体系结构的研究;与当前其他IA-64编译器相比,要有比较高的性能。代码优化的一个重要目标是为了减少程序的执行时间。

Analysis on Serial Timing System of Alternating Current

Many compiler optimization techniques depend on which part code has been executed frequently. Profiling will trace and record these information that a compiler needs automatically, which is useful to other phases during compile. Profiling will instrument some internal code that gather these information during a program executes. For example , edge profiling computes the frequency of basic block and the probability of edge in control flow graph. Value profiling determine which variables have invariant behavior. This paper explores the basic block frequency found from edge profiling. We use the edge profiling to perform some optimization for Spec2000 test cases, showing that the optimization base edge profiling can reduce a program's execution time up to 5%.