Inside the Java Virtual Machine
Inside the Java Virtual Machine
The Java Language Specification
The Java Language Specification
Instruction Folding in Java Processor
ICPADS '97 Proceedings of the 1997 International Conference on Parallel and Distributed Systems
Object-Oriented Architectural Support for a Java Processor
ECCOP '98 Proceedings of the 12th European Conference on Object-Oriented Programming
Investigating hardware micro-instruction folding in a Java embedded processor
Proceedings of the 8th International Workshop on Java Technologies for Real-Time and Embedded Systems
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Instruction-level parallelism of stack codes like Java is severely limited by accessing the operand stack sequentially. To resolve this problem in Java processor design, our earlier works have presented stack operations folding to reduce the number of push/pop operations in between the operand stack and the local variable. In those studies, Java bytecodes are classified into three major POC types. Statistical data indicates that the 4-foldable strategy of the POC folding model can eliminate 86% of push/pop operations. In this research note, we propose an Enhanced POC (EPOC) folding model to eliminate more than 99% of push/pop operations with an instruction buffer size of 8 bytes and the same 4-foldable strategy. The average issued instructions per cycle for a single pipelined architecture is further enhanced from 1.70 to 1.87.