DSP and processing method thereof for loop jump instruction

Abstract

The invention discloses a DSP and a processing method thereof for a loop jump instruction. The method comprises the following steps: reading a loop jump instruction assembly program in an instruction fetching stage of a pipeline period, wherein the loop jump instruction assembly program comprises a register address for storing a loop jump instruction variable, a loop jump threshold value, a variable processing label and a jump target address, and the assembly line period at least comprises an instruction fetching stage, a decoding stage and an execution stage; decoding the read loop jump instruction to obtain the decoded loop jump instruction information; and according to the value of the variable in the register and a cyclic jump threshold, judging whether jump is needed or not, if so, jumping to the jumping target address, and otherwise, carrying out cyclic processing on the value of the variable according to a cyclic processing mode in the cyclic jump instruction. The method improves the processing efficiency of the DSP processor.

Description

technical field [0001] The invention relates to the technical field of instruction processing, in particular to a DSP processor and a method for processing loop jump instructions thereof. Background technique [0002] In the prior art, it generally needs 3 pipeline cycles to execute the loop jump instruction. Taking the for loop of C language as an example, if the (i=0; i<=0x1F; i++) loop is to be realized, the assembler generally needs to write three lines instructions, such as: [0003] [0004] Among the above three instructions, the first instruction I1 is used to judge whether the value of the variable in the register R31 is equal to 0x1F, and store the comparison result in the status register, the second instruction I2 executes the increment of the R31 register, and the third The first instruction I3 decides whether to perform a branch jump according to the flag status register. It can be seen that, in the prior art, it takes 3 pipeline cycles to execute a for ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a DSP processor and a processing method of a loop jump instruction thereof, so as to solve the problem in the prior art that three pipeline cycles are required to execute a loop jump instruction, resulting in low processor efficiency

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