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Journals ACM SIGARCH Computer Architecture News Volume 33 Issue 4

Abstract machines bridge the gap between a programming language and real machines. This paper proposes a general purpose tagged execution framework that may be used to construct a CPU. The CPU may accept code written in any (abstract or real) machine instruction set, and produce tagged machine code after data conflicts are resolved. This requires the construction of a tagging unit, which emulates the sequential execution of the program using tags rather than actual values. The tagged instructions are then sent to an execution engine that maps tags to values as they become available and sends ready-to-execute instructions to arithmetic units. The process of mapping tag to value may be performed using the Tomasulo scheme, or a register scheme with the result of instructions going to registers specified by their destination tags, and waiting instructions receiving operands from registers specified by their source tags.The tagged execution framework is suitable for any instruction architecture from RISC machines to stack machines. We will illustrate with an example of a Java ILP processor using a VLIW execution engine. Some related implementing issues are discussed.

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A general framework to build new CPUs by mapping abstract machine code to instruction level parallel execution hardware

Wang, H. C.; Yuen, C. K.
ACM SIGARCH Computer Architecture News , Volume 33 (4)
Association for Computing Machinery – Nov 1, 2005

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