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Paper Abstract and Keywords
Presentation 2015-07-23 09:30
Dependency Based Factoring
Takashi Nasu, Munehiro Takimoto (TUS) SS2015-20 KBSE2015-13
Abstract (in Japanese) (See Japanese page) 
(in English) Branch divergence caused by Single Instruction Multiple Data (SIMD) execution extremely decreases the performance of GPU. One of effective optimizations for suppressing the branch divergence is code factoring, which is a program transformation factoring out instructions with identical operators on branch paths as a common instruction. In general, the factorization of several instructions may require introduction of some new branches to hold dependencies of the instructions at the sacrifice of the optimization effect. In other words, the naive factorization of instructions may prevent subsequent instructions from being factored out through a single branch insertion. In this paper, we propose a new code factoring approach that not only detects instructions with identical operators, but also considers their dependencies. Our approach preferentially factors out the larger sequence of instructions with the same dependence structure, so that more instructions can be factored out through a single branch insertion. Furthermore, the factorization manner enables factoring instructions across nested branches. In order to prove the effectiveness of our approach, we have conducted experiments for the number of instructions factored out and the improvement of execution efficiency on SPEC CPU2000 and GPU benchmarks respectively. Their results show that our approach increases instructions factored out as much as 77% compared with the naive approach, and show that it maximally achieves speed-up by almost 12% on GPU.
Keyword (in Japanese) (See Japanese page) 
(in English) GPU / Branch divergence / Code factoring / Code clone / Congruence detection / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 153, SS2015-20, pp. 57-62, July 2015.
Paper # SS2015-20 
Date of Issue 2015-07-15 (SS, KBSE) 
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 SS2015-20 KBSE2015-13

Conference Information
Committee KBSE SS IPSJ-SE  
Conference Date 2015-07-22 - 2015-07-24 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SS 
Conference Code 2015-07-KBSE-SS-SE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Dependency Based Factoring 
Sub Title (in English)  
Keyword(1) GPU  
Keyword(2) Branch divergence  
Keyword(3) Code factoring  
Keyword(4) Code clone  
Keyword(5) Congruence detection  
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1st Author's Name Takashi Nasu  
1st Author's Affiliation Tokyo University of Science (TUS)
2nd Author's Name Munehiro Takimoto  
2nd Author's Affiliation Tokyo University of Science (TUS)
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Speaker Author-1 
Date Time 2015-07-23 09:30:00 
Presentation Time 30 minutes 
Registration for SS 
Paper # SS2015-20, KBSE2015-13 
Volume (vol) vol.115 
Number (no) no.153(SS), no.154(KBSE) 
Page pp.57-62 
#Pages 6 
Date of Issue 2015-07-15 (SS, KBSE) 

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