Processing method for calling subprogram of microprocessor, and device for same

Abstract

The invention discloses a processing method for calling a subprogram of a microprocessor, and a device for the same. The method comprises the following steps of: obtaining a subprogram calling instruction which carries an unsigned immediate; extracting the unsigned immediate from the subprogram calling instruction; obtaining the total number of the instructions in a delay slot according to the unsigned immediate; and obtaining the return address of the subprogram calling instruction according to the total number of the instructions in the delay slot. The device comprises the following units: an obtaining unit for obtaining the subprogram calling instruction, an extraction unit for extracting the unsigned immediate from the subprogram calling instruction, and a calculation unit for obtaining the total number of the instructions in the delay slot according to the unsigned immediate and calculating the return address of the subprogram calling instruction according to the total number of the instructions in the delay slot. According to the method and the device for the same, performance of the processor in the aspect of processing the subprogram calling instruction is greatly improved.

Description

technical field [0001] The invention relates to a processor technology, in particular to a processing method and a device for calling a microprocessor subroutine. Background technique [0002] In various application programs, conditional jump instructions are frequently used instructions. Subroutine call classes and loops are one of the main fields of application of conditional jump instructions. The efficient design of conditional jump instructions is the key to efficient operation of the processor. The essential. [0003] In existing processors, a jump instruction is generally implemented by a J instruction or a B instruction. This type of jump instruction mainly realizes jumping a program to a specific address, wherein an immediate value or a register is used as an offset. [0004] The subroutine call type jump requires that it can jump to the subroutine entry address first, and then after the execution of the subroutine is completed, the execution sequence of the instru...

AI Technical Summary

Problems solved by technology

If Y>N delay_slot *X, the setting of X is too small compared to the current jump, which limits the development of delay slot parallelism, thus affecting the performance of multi-issue processors; if Ydelay_slot *X, then the setting of X is too large compared to the current jump, and Y-N needs to be filled delay_slot *X NOP instructions

Therefore, this method has poor flexibility, which will reduce the high performance of the processor or cause problems such as instruction code redundancy, waste of program storage space, instruction fetch bandwidth and power consumption.

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