Instruction simplification method and system for byte code instruction set

Abstract

The invention relates to an instruction simplification method and system for a bytecode instruction set. According to the method, an instruction for assigning a constant to a register in an initial instruction and an instruction using the register as an operand can be optimized into an instruction with a constant operand, or the instruction with the constant operand is directly generated; the method comprises the following steps: converting an instruction for accessing an instance domain of a current instance or generating a special instruction for accessing the instance domain of the current instance, encoding a sub-constant pool index operand in the instruction to an operation code adjacent to the instruction, determining the type of a sub-constant pool through the operation code, separating a variable-length operand in a variable-length instruction from the instruction code, according to the method, a pseudo instruction for static field initialization is generated, the pseudo instruction can replace a traditional static field component, an instruction for repeatedly using a register is optimized into an instruction for multiplexing the register, and a group of instructions which have similar functions and are not commonly used are compounded into one instruction. By adopting the method provided by the invention, the length of the byte code can be reduced, and the execution performance of the byte code is improved.

Description

technical field [0001] The invention belongs to the technical field of instruction set simplification, and in particular relates to a method and system for instruction simplification of a bytecode instruction set. Background technique [0002] A virtual machine is an abstract computer generated by a software application or instruction sequence executed by a processor. The virtual machine can execute the instruction set supported by the virtual machine. There are two types of instruction sets based on the operand stack and based on the register. Compared with the register-based instruction set, the instruction set based on the operand stack adopts the stack frame structure. The method call process involves stacking and popping, and the bytecode execution process also involves the stacking and popping of the operand stack. , although the RAM overhead is small, but the execution efficiency is low. Contents of the invention [0003] Aiming at the defects existing in the prior...

AI Technical Summary

Problems solved by technology

Compared with the register-based instruction set, the instruction set based on the operand stack adopts the stack frame structure. The method call process involves stacking and popping, and the bytecode execution process also involves the stacking and popping of the operand stack. , although the RAM overhead is small, but the execution efficiency is low

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