Dynamic parallel media processing using speculative broadcast loop (SBL)
This paper presents the results of a study of dynamic parallel media processing using Speculative Broadcast Loop (SBL), a speculative run-time looplevel parallelization method. Due to processing regularity, multimedia applications typically contain extensive parallelism. Subword parallelism methods are commonly used to support data parallelism between independent loop iterations in inner loops, but much of the data parallelism in media processing resides in outer loops and cannot be supported with subword parallelism. Larger-scale parallel methods are needed to enable use of the full range of data parallelism in multimedia. Because static parallel compilation methods are often unable to recognize all parallelism at compile time, a run-time method is assumed for the speculative execution of potentially parallel loops. The SBL run-time method combines SIMD parallelism with large-scale speculation for supporting data parallelism in multimedia.