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Realization method of return-address stack for supporting automatic error correction function

A technology of returning an address stack and an implementation method, applied in the field of embedded processor systems, can solve the problems of low prediction accuracy and large hardware overhead, and achieve the effect of improving the efficiency of instruction fetching and processing performance

Active Publication Date: 2013-01-09
C SKY MICROSYST CO LTD
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AI Technical Summary

Problems solved by technology

The former needs to save a copy of the stack top pointer for each branch instruction, and the prediction accuracy is not high; although the latter can obtain 100% prediction accuracy, the hardware overhead is too large

Method used

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  • Realization method of return-address stack for supporting automatic error correction function
  • Realization method of return-address stack for supporting automatic error correction function
  • Realization method of return-address stack for supporting automatic error correction function

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] refer to Figure 1-Figure 3 , a return address stack implementation method supporting automatic error correction function, the return address stack implementation method includes the following steps:

[0026] 1) During the instruction prefetch process, pre-decode the function call instruction and the function return instruction, and perform the stacking and popping operation of the function return address information according to the pre-decoding result;

[0027] 2) Setting the stack top pointer to identify the position of the current operation of the address stack when the instruction is pre-decoded;

[0028] 3) The retirement pointer is used to record the return address stack state after the function call and the function return instruction are retired, and the retirement pointer is used to automatically restore the top pointer of the stack when the pipeline ...

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Abstract

The invention discloses a realization method of a return-address stack for supporting an automatic error correction function, which comprises the steps of: 1) precoding a function calling instruction and a function returning instruction during prefetching the instructions, and pushing the tack and popping the stack to function returning address information according to a precoding result; and 2) setting the position of the current operation of the return-address stack when precoding an identification instruction of a stack top address stack needle; and 3) recording the status of the return-address stack after the function calling instruction and the function returning instruction are retired with a retired needle, and automatically recovering the stack top needle with the retired needle when emptying a flow line. The method can effectively improve the forecasting precision of the return of the function and improving the performance of a processor.

Description

technical field [0001] The invention belongs to the field of embedded processor systems. More specifically, it relates to a method for implementing a function return address stack. Background technique [0002] Since the development of embedded processors, it has shown great application value in the fields of multimedia codec, communication technology and VLSI design. For a long time, embedded processors have strict design requirements for multiple indicators such as power consumption, area, cost, and performance. With the continuous expansion of application fields and the continuous improvement of application requirements, higher requirements are put forward for the processing performance of embedded processors. [0003] Today, when pipeline technology is widely used in processor design, how to give full play to the role of pipeline has become a key issue to be considered in design. The obstacle brought by branch instructions to the application of pipeline technology mak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F9/38
Inventor 严晓浪龚帅帅葛海通孟建熠
Owner C SKY MICROSYST CO LTD
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