Instruction Set Extension for Java Bytecode

• Main Authors: Yi-Chieh Wang, 王繹傑
• Other Authors: Ting-Wei Hou
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/41889087975284590298

碩士 === 國立成功大學 === 工程科學系碩博士班 === 97 === This thesis is to define a subset of Java bytecodes that are suitable for instruction set extension as the basis of CPU executing Java bytecode directly. The first step is to analyze the usage of each Java bytecode from benchmark programs, and then identify the bytecodes suitable for instruction set extension. These experiments are performed on the open-source Java Virtual Machine, the JamVM and GNU Classpath. These experiments collect the usage of Java bytecodes of the DaCapo benchmark suite. We implemented a profiler inside the JVM to help tracing and analyzing Java bytecodes executed. This thesis used ARM instruction’s clock cycles to evaluate each Java bytecode cycle counts. The evaluation method is to multiply the execution times of each bytecode by the implementation’s clock cycles. After evaluation, we propose 28 Java bytecodes for instruction set extension. The cycle counts of these 28 bytecodes are accounted for all of the 81.42% of the benchmark programs.