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| 一种软件流水的反流水算法 |
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汤志忠1, 李文龙1, 苏伯珙2
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1.清华大学,计算机科学与技术系,北京,100084;2.William Paterson大学,计算机科学系,新泽,西洲,07470,美国
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| 摘要: |
| 软件流水是一种循环程序的优化技术,已经广泛应用于现代优化编译器中.为了充分利用VLIW DSP处理机的指令级并行性,必须使用软件流水技术对DSP程序进行优化.然而,在串行源代码不存在的情况下,对软件流水后的原始代码进行变换、理解、测试和调试,并转换成其他处理机的代码是非常困难的.提出了一种反流水技术,它能够将软件流水后的优化汇编代码反向转换成语义等价的相应代码.通过20个程序的初步实验,验证了所提出的反流水算法的正确性. |
| 关键词: 软件流水 反流水 指令级并行 |
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| 基金项目:Supported bytheNationalNatural Science Foundation ofChina underGrantNo.60173010(国家自然科学基金) |
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| A De-Pipeline Algorithm for Software-Pipeline |
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TANG Zhi-Zhong,LI Wen-Long,SU Bo-Gong
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| Abstract: |
| Software pipelining is a loop optimization technique that has been widely implemented in modern optimizing compilers. In order to fully utilize the instruction level parallelism of the recent VLIW DSP processors, DSP programs have to be optimized by software pipelining. However, because of the transformation of the original sequential code, a software-pipelined loop is often difficult to understand, test, and debug. It is also very difficult to reuse and port a software-pipelined loop to other processors, especially when the original sequential code is unavailable. In this paper we propose a de-pipelining algorithm which converts the optimized assembly code of a software-pipelined loop back to a semantically equivalent sequential counterpart. Preliminary experiments on 20 programs verify the validity of the proposed de-pipelining algorithm. |
| Key words: software pipelining de-pipelining instruction level parallelism |
