NDLI: A Recursive Model for Smooth Approximation to Wirelength and Its Impact on Analytical Placement

Content Provider	IEEE Xplore Digital Library
Author	Ray, B.N.B. Balachandran, Shankar
Copyright Year	2015
Abstract	Analytical placement engines use half-perimeter wire length (HPWL) of the circuit as an objective function to place blocks optimally within a chip. Inspired by popularly used log sum-exp (LSE) wire length model [6], ABS wire length model [5] and weighted average (WA) wire length model [3], we propose a new recursive wire length model for HPWL, providing smooth approximation to the max function. We show that the accuracy of the new model is better than that of LSE, WA and ABS wire length models, both theoretically and experimentally. When deployed inside an analytical engine, we show that our model provides more than 12% reduction in wire length compared to LSE at the expense of 50% more runtime. We also observed that the proposed model and the existing iterative models differ in their impact on the relative effort that has to be put in at the global placement vs. The detailed placement phase.
Starting Page	417
Ending Page	422
File Size	243262
Page Count	6
File Format	PDF
ISBN	9781479966585
ISSN	10639667
DOI	10.1109/VLSID.2015.76
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-03
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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A Recursive Model for Smooth Approximation to Wirelength and Its Impact on Analytical Placement