loading...
 This Article 
   
 Share 
   
 Bibliographic References 
   
 Add to: 
 
Digg
Furl
Spurl
Blink
Simpy
Google
Del.icio.us
Y!MyWeb
 
 Search 
   
Design, Automation and Test in Europe (DATE '99)
Exploiting Conditional Instructions in Code Generation for Embedded VLIW Processors
Munich, Germany
March 09-March 12
ISBN: 0-7695-0078-1
Rainer Leupers, University of Dortmund
This paper presents a new code optimiza-tion technique for a class of embedded processors. Mod-ern embedded processor architectures show deep instruction pipelines and highly parallel VLIW-like instruction sets. For such architectures, any change in the control flow of a ma-chine program due to a conditional jump may cause a signif-icant code performance penalty. Therefore, the instruction sets of recent VLIW machines offer support for branch-free execution of conditional statements in the form of so-called conditional instructions. Whether an if-then-else statement is implemented by a conditional jump scheme or by conditional instructions has a strong impact on its worst-case execution time. However, the optimal selection is difficult particularly for nested conditionals. We present a dynamic programming technique for selecting the fastest implementation for nested if-then-else statements based on estimations. The efficacy is demonstrated for a real-life VLIW DSP.
Citation:
Rainer Leupers, "Exploiting Conditional Instructions in Code Generation for Embedded VLIW Processors," date, pp.105, Design, Automation and Test in Europe (DATE '99), 1999
Usage of this product signifies your acceptance of the Terms of Use.