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Paper Abstract and Keywords
Presentation 2013-05-16 15:00
Data Dependence Relaxation Techniques for Reducing Iteration Intervals in Pipelined Loops
Shingo Kusakabe, Kenshu Seto (Tokyo City Univ.) VLD2013-7
Abstract (in Japanese) (See Japanese page) 
(in English) In the loop pipelining of high-level synthesis, the sum of the delays in the cycles of the data dependence graph is a major factor that determines the initiation interval.
When the cycles contain RAW dependences between arrays and whether the RAW dependences occur or not depend on the execution of the loop, existing loop pipelining techniques pessimistically assume that the RAW dependences always exist, so that the reduction of the initiation interval is insufficient.
In this paper, we propose an effective technique to reduce the initiation intervals of the loops which contain such RAW dependences.
In the proposed technique, the written data to arrays in such RAW dependences are also written to temporary variables and the temporary variables are read when the RAW dependences occur, thereby the sum of delays in the cycles are reduced and the initiation intervals are minimized.
Experimental results with two examples show that the proposed technique successfully achieves 2.56x speedup with 1.76x increase in circuit area.
Keyword (in Japanese) (See Japanese page) 
(in English) high level synthesis / loop pipelining / RAW dependence / forwarding / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 30, VLD2013-7, pp. 55-60, May 2013.
Paper # VLD2013-7 
Date of Issue 2013-05-09 (VLD) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF VLD2013-7

Conference Information
Committee VLD IPSJ-SLDM  
Conference Date 2013-05-16 - 2013-05-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Kitakyushu International Conference Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) System Design, etc. 
Paper Information
Registration To VLD 
Conference Code 2013-05-VLD-SLDM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Data Dependence Relaxation Techniques for Reducing Iteration Intervals in Pipelined Loops 
Sub Title (in English)  
Keyword(1) high level synthesis  
Keyword(2) loop pipelining  
Keyword(3) RAW dependence  
Keyword(4) forwarding  
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1st Author's Name Shingo Kusakabe  
1st Author's Affiliation Tokyo City University (Tokyo City Univ.)
2nd Author's Name Kenshu Seto  
2nd Author's Affiliation Tokyo City University (Tokyo City Univ.)
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Speaker Author-1 
Date Time 2013-05-16 15:00:00 
Presentation Time 25 minutes 
Registration for VLD 
Paper # VLD2013-7 
Volume (vol) vol.113 
Number (no) no.30 
Page pp.55-60 
#Pages 6 
Date of Issue 2013-05-09 (VLD) 

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