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SETIT 2009

Par Emmanuel CasseauDernière modification 30/03/2009 11:30

S. Khan, E. Casseau, D. Menard “SWP for multimedia operator design” SETIT Conference, Sciences of Electronic, Technologies of Information and Telecommunications, 22-26 March 2009, Hammamet, Tunisia

SWP for multimedia operator design
S. Khan, E. Casseau, D. Menard

Abstract: Subword parallelism SWP utilizes data level parallelism to increase the performance of processors. With SWP each operand is partitioned into multiple lower precision operands, called subwords. A single SWP instruction performs the same operation on multiple sets of subwords in parallel using SWP enabled operators. As a result of SWP, same datapath and operator can be used to perform more than one computation on composite word in parallel. Classical SWP operators operates on subword data lengths of 8, 16, 32bits etc. However in multimedia applications pixels are usually of 8, 10 or 12bits or sometimes 16bits size. This non coordination between classical subword sizes and pixel data sizes results in the under utilization of processor resources. In this paper multimedia oriented basic SWP operators are proposed that can support pixel data sizes used in most modern multimedia applications. The performances of these multimedia operators are analyzed by computing multimedia operations like sum of absolute difference SAD using both classical and multimedia oriented SWP operators.

Key words: Multimedia processing, data level parallelism, reconfigurable systems, and embedded systems.


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