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Issue No.02 - April (1995 vol.15)
pp: 22-32
ABSTRACT
This article defines multimedia, and motivates the use of multimedia benchmarks in the design of general-purpose computers and general-purpose microprocessors. It describes a minimalistic set of multimedia instructions introduced into PA-RISC microprocessors that allow sophisticated SIMD-MIMD parallelism to be implemented, with insignificant changes to the underlying microprocessor. This enabled for the first time, a video decoder implemented in software to attain MPEG video and audio decompression and playback at realtime rates of 30 frames per second, on an entry-level workstation.Unlike previous approaches, no special DSP, coprocessor or functional unit was added to the microprocessor. The multimedia instructions include parallel subword add, subtract, average, shift_left_and_add andshift_right_and_add instructions. Signed, and a novel form of unsigned saturation, is also supported. These general-purpose parallel subword instructions are useful for accelerating a variety of multimedia programs.
INDEX TERMS
Multimedia, benchmarking, microprocessors, parallel computing, MPEG standard, video/audio
CITATION
Ruby B. Lee, "Accelerating Multimedia with Enhanced Microprocessors", IEEE Micro, vol.15, no. 2, pp. 22-32, April 1995, doi:10.1109/40.372347
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