Informatics Report Series



Related Pages

Report (by Number) Index
Report (by Date) Index
Author Index
Institute Index

Title:Resource Sharing in Custom Instruction Set Extensions
Authors: Gloria Marcela Zuluaga Agudelo ; Nigel Topham
Date:Jun 2008
Publication Title:6th IEEE Symposium on Application Specific Processors
Publication Type:Conference Paper Publication Status:Published
Page Nos:7-13
DOI:10.1109/SASP.2008.4570779 ISBN/ISSN:978-1-4244-2333-0
Customised processor performance generally increases as additional custom instructions are added. However, performance is not the only metric that modern systems must take into account; die area and energy efficiency are equally important. Resource sharing during synthesis of instruction set extensions (ISEs) can reduce significantly the die area and energy consumption of a customised processor. This may increase the number of custom instructions that can be synthesised with a given area budget. Resource sharing involves combining the graph representations of two or more ISEs which contain a similar sub-graph. This coupling of multiple sub-graphs, if performed naively, can increase the latency of the extension instructions considerably. And yet, as we show in this paper, an appropriate level of resource sharing provides a significantly simpler design with only modest increases in average latency for extension instructions. Based on existing resource-sharing techniques, this study presents a new heuristic that controls the degree of resource sharing between a given set of custom instructions. Our main contributions are the introduction of a parametric method for exploring the trade-offs that can be achieved between instruction latency and implementation complexity, and the coupling of design-space exploration with fast area-delay models for the operators comprising each ISE. We present experimental evidence that our heuristic exposes a broad range of design points, allowing advantageous trade-offs between die area and latency to be found and exploited.
Links To Paper
Publisher's website
Bibtex format
author = { Gloria Marcela Zuluaga Agudelo and Nigel Topham },
title = {Resource Sharing in Custom Instruction Set Extensions},
book title = {6th IEEE Symposium on Application Specific Processors},
publisher = {IEEE},
year = 2008,
month = {Jun},
pages = {7-13},
doi = {10.1109/SASP.2008.4570779},
url = {},

Home : Publications : Report 

Please mail <> with any changes or corrections.
Unless explicitly stated otherwise, all material is copyright The University of Edinburgh