DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/5050

Title: Bidirectional data flow analysis: Myths and reality
Authors: KHEDKER, UP
DHAMDHERE, DM
Keywords: strength reduction transformation
partial redundancy elimination
global program optimization
code motion
algorithm
frameworks
suppression
renvoise
morel
Issue Date: 1999
Publisher: ASSOC COMPUTING MACHINERY
Citation: ACM SIGPLAN NOTICES, 34(6), 47-57
Abstract: Research in bidirectional data flow analysis seems to have come to a halt due to an impression that the case for bidirectional data flow analysis has been considerably weakened by a plethora of investigations based on decomposability of known bidirectional placement algorithms into a sequence of purely unidirectional components. This paper shows that the approach of decomposability is not general enough in that it derives its power from the simplifying graph transformation of edge-splitting and the favourable nature of flows in partial redundancy elimination (PRE). This follows from the fact that in the absence of edge-splitting, PRE cannot be performed using a sequence of cascaded unidirectional flows. Further, edge-splitting inherently converts data flows involved in PRE into unidirectional flows. In our opinion, this obviates the need of an alternative formulation. We also show that edge-splitting cannot convert data flows involved in "truly" bidirectional data flow problems into unidirectional flows. Thus not every bidirectional data flow problem can be converted into unidirectional flows. Besides, we argue that the premise that bidirectional analysis is more complex than unidirectional analysis, is invalid. We also mention some issues in bidirectional data flow analysis which need to be investigated.
URI: http://dx.doi.org/10.1145/606666.606676
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5050
http://hdl.handle.net/10054/5050
ISSN: 0362-1340
Appears in Collections:Article

Files in This Item:

There are no files associated with this item.

View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback