Apparatus and method for checking floating point stack overflow on non-CISC processor

Abstract

The invention discloses a device and a method conducting floating-point stack overflow check on a non-complex instruction set computer processor. The device comprises a floating-point register stack, which comprises a plurality of stack registers, which can conduct floating-point calculation; an overflow check register used for stack overflow exceptional check when conducting floating-point access, which comprises a plurality of bits corresponding to the stack registers, and all the bits separately indicate the states of corresponding stack registers; a stack overflow judge module, which is used for checking the stack registers in the specified floating-point register stack, conducting operation to the overflow check register in accordance with the values of the stack registers, and carry out the floating-point stack overflow check. The invention can greatly reduce the workload and improve efficiency of a virtual machine.

Description

technical field [0001] The invention relates to the technical field of microprocessors, in particular to a non-complex instruction set computer processor that supports a floating point stack in a complex instruction set computer (CISC), performs floating point stack overflow checks, and prevents the floating point stack from overflowing Apparatus and methods. Background technique [0002] The central processing unit (CPU), referred to as the microprocessor, is the core unit of the computer. The instruction set and design specification (architecture) adopted by the microprocessor are the primary characteristics of the computer, which determine the types of peripheral equipment and application software that the computer needs to adopt. [0003] The two architectures that are more popular in the world today are: the Reduced Instruction Set Computing (RISC) architecture represented by MIPS32 / 64 of MIPS Corporation and the Complex Instruction Set Computer (RISC) architecture rep...

AI Technical Summary

Problems solved by technology

[0009] If the floating-point stack overflow exception is not found during the running of multiple virtual machine programs, the program may perform wrong operations and continue along the wrong path, and the error is more difficult to find until it causes a relatively large loss

Therefore, when the virtual machine simulates X86, it is often necessary to maintain an overflow check mechanism to monitor the status of the floating-point stack in real time, but this check mechanism has a certain performance impact on the virtual machine, and it is not convenient for the program to check the data status in the stack. understanding of

Images