SIMD-aware loop unrolling for embedded code optimization

Yunyang Dai; Qing Li; Qi Zhang; C.-C. Jay Kuo

doi:10.1117/12.513540

19 November 2003 SIMD-aware loop unrolling for embedded code optimization

Yunyang Dai, Qing Li, Qi Zhang, C.-C. Jay Kuo

Proceedings Volume 5241, Multimedia Systems and Applications VI; (2003) https://doi.org/10.1117/12.513540
Event: ITCom 2003, 2003, Orlando, Florida, United States

Abstract

Due to the rising complexity of modern embedded media applications (EMAs), the instruction level parallelism (ILP) is not sufficient to meet the need. Compilers must have the capability to exploit the superword level parallelism (SLP), which can expose more concurrency lying in applications, minimize the latency created by memory access and hence produce more efficient codes. The loop is a good candidate for SLP extraction because of its paralleled structure between iterations. This work analyzes the memory access patterns found in EMAs and presents our method of loop unrolling to fully utilize these patterns to generate efficient Single Instruction Multiple Data (SIMD) instructions. Experimental results performed on TriMedia TM-1300 processor for the H.264 encoder show performance improvement by a factor ranging from 3 to 30 times with an average of 12 times.

Citation Download Citation

Yunyang Dai, Qing Li, Qi Zhang, and C.-C. Jay Kuo "SIMD-aware loop unrolling for embedded code optimization", Proc. SPIE 5241, Multimedia Systems and Applications VI, (19 November 2003); https://doi.org/10.1117/12.513540

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