Optimization of conversion of a character coding system

Details Optimization of conversion of a character coding system Optimization of conversion of a character coding system

2005-04-01

2009-08-18

Kendall, Chuck O (Department: 2192)

Data processing: software development, installation, and managem

Software program development tool

Code generation

C717S107000, C717S136000, C717S148000, C717S152000, C717S159000

Reexamination Certificate

active

07577936

ABSTRACT:
A compiler optimizing conversion of a character coding system for a character stored in a string variable in a target program to be optimized has a conversion instruction generation section which generates a conversion instruction to convert a character from a first character coding system to a second character coding system and to store the converted character in the string variable, the conversion instruction being generated before each of a plurality of procedures by which the character in the string variable written in the first character coding system is read out and is used in the second character coding system, and a conversion instruction removal section which removes each of conversion instructions generated by the conversion instruction generation section if a character in the second character coding system is stored in the string variable in each of the execution paths executed before the conversion instruction.

REFERENCES:
patent: 2005/0086584 (2005-04-01), Sampathkumar et al.
Norimatsu Yasutomo, C Language General Knowledge Course, the 5th installment, Optimization Technique.
Matsuoka Yasumasa et al, “Technique for Compiler Optimization”.
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InternetURL,http://cvs.apache.org/viewcvs.cgi/xml-xerces/java/src/org/apache/xerces/impl/io/UTF8Reader.java?rev=1.7&content-type=text/vnd.viewcvs-markup.
Makino et al. Implementation and Performance of WS-Security-IBM Research Report RT0546, 2003.
Ruthing er al. “Optimal Code Motion: Theory and Practice,” ACM TPLAS, 18(3), 300-324, 1996.
Bodik et al. “Complete Removal of Redudant Expressions,” in proceedings of the ACM SIGPLAN 1998 Conference on Programming Language Design and Implementation, pp. 1-14, 1998.

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