The Community for Technology Leaders
2015 Seventh International Symposium on Parallel Architectures, Algorithms and Programming (PAAP) (2015)
Nanjing, China
Dec. 12, 2015 to Dec. 14, 2015
ISSN: 2168-3042
ISBN: 978-1-4673-9116-0
pp: 13-19
ABSTRACT
SIMD (Single Instruction Multiple Data) extension units are ubiquitous in modern processors. Array indirections raise several challenges for SIMD vectorization including disjoint memory access, unknown alignment and dependence cycle. Existing SIMD automatic vectorization methods fail to handle these challenges very well. This paper presents a new method exploiting Pure SLP (Superword Level Parallelism) to address these problems. Dependence equation is rewritten to work out the dependence testing for index array. To address the problem of non-aligned and disjoint challenges, data alignment in recombinant registers and redundant statements are employed respectively. In addition, a precise cost model is proposed to guarantee positive benefits. Experiments on three typical array indirection applications extracted from SPEC2006 benchmarks verified the validity of this method.
INDEX TERMS
Arrays, Testing, Indexes, Parallel processing, Mathematical model, Registers, Program processors,cost model, SIMD, array indirections, loop-independent dependence, Pure SLP
CITATION
Huihui Sun, Rongcai Zhao, Wei Gao, Yi Gong, Gang Li, "Exploiting Pure Superword Level Parallelism for Array Indirections", 2015 Seventh International Symposium on Parallel Architectures, Algorithms and Programming (PAAP), vol. 00, no. , pp. 13-19, 2015, doi:10.1109/PAAP.2015.14
72 ms
(Ver 3.3 (11022016))