Abstract: For multimedia embedded system, source code optimization methodology is the key to get high profile media performance. With more embedded CPU adopting RISC plus SIMD architecture, this paper puts forward a code optimization flow to implicitly and explicitly explore this processor architecture. This method is used to optimize and tune the implementation of a MP3 audio decoder on the XScale portable embedded system. It shows that using this methodology can quickly and easily redesign the software to increase 60% performance over the original software in short time.

Key words: embedded RISC processor, SIMD architecture, MP3 decoding

摘要： 嵌入式处理器越来越多地采用SIMD并行架构来提升其媒体处理能力，该文提出基于该架构的优化流程，采用算法和处理器架构紧密结合的优化原则，利用现有编译器来降低汇编编程工作量，对算法关键部分采用手工编程来确保优化效率。该流程被应用在基于XScale平台的MP3解码优化中，短时间内将解码效率提高60%，接近IPP库的性能。

关键词: 嵌入式RISC处理器, SIMD并行处理架构, MP3解码

CLC Number: 

• TP311.54