Efficient emulation of MIMD behavior on SIMD machines

SIMD computers have proved to be a useful and cost effective approach to massively parallel computation. On the other hand, there are algorithms which are very inefficient when directly translated into a data-parallel program.This paper presents a number of simple transformations which are able to reduce this SIMD overhead to a moderate constant factor. It also introduces techniques for reducing the remaining overhead using Markov chain models of control flow. The optimization problems involved are NP-hard in general but there are many useful heuristics, and closed form optimizations for a probabilistic variant

A configurable vector processor for accelerating speech coding algorithms

The growing demand for voice-over-packer (VoIP) services and multimedia-rich applications has made increasingly important the efficient, real-time implementation of low-bit rates speech coders on embedded VLSI platforms. Such speech coders are designed to substantially reduce the bandwidth requirements thus enabling dense multichannel gateways in small form factor. This however comes at a high computational cost which mandates the use of very high performance embedded processors. This thesis investigates the potential acceleration of two major ITU-T speech coding algorithms, namely G.729A and G.723.1, through their efficient implementation on a configurable extensible vector embedded CPU architecture. New scalar and vector ISAs were introduced which resulted in up to 80% reduction in the dynamic instruction count of both workloads. These instructions were subsequently encapsulated into a parametric, hybrid SISD (scalar processor)–SIMD (vector) processor. This work presents the research and implementation of the vector datapath of this vector coprocessor which is tightly-coupled to a Sparc-V8 compliant CPU, the optimization and simulation methodologies employed and the use of Electronic System Level (ESL) techniques to rapidly design SIMD datapaths

Data bases and data base systems related to NASA's aerospace program. A bibliography with indexes

This bibliography lists 1778 reports, articles, and other documents introduced into the NASA scientific and technical information system, 1975 through 1980

1994-1995 Bulletin

Volume 104, Number 1 Scanned from the copy held in the Registrar\u27s Office.https://ecommons.udayton.edu/bulletin_grad/1027/thumbnail.jp