Instruction prefetching filtering method

An instruction prefetching and filtering method technology, applied in concurrent instruction execution, program control design, instrumentation, etc., can solve problems such as uneconomical, improve utilization, facilitate prefetch query, and achieve simple effects

Active Publication Date: 2020-04-10
上海高性能集成电路设计中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the consideration of logic implementation cost and physical implementation overhead, it is not cost-effective to add ports for instruction cache

Method used

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  • Instruction prefetching filtering method
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Examples

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Embodiment Construction

[0019] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0020] The embodiment of the present invention relates to an instruction prefetching filtering method, an instruction prefetching filtering device is set between the instruction cache and the next-level storage system, and the instruction prefetching filtering device interacts closely with the instruction cache and the next-level storage system , its position in the system is as figure 1 shown. The instruction prefetching and...

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Abstract

The invention relates to an instruction prefetching filtering method. An instruction prefetching filtering device is arranged between an instruction cache and a next-level storage system, and comprises filtering buffers of a plurality of entries, wherein the filtering buffer of each entry corresponds to a basic page and is used for recording and tracking a Cache line loaded with the instruction cache in a basic page; and the instruction prefetching filtering device is directly inquired when an instruction stream is prefetched each time, so whether the prefetched Cache line is in the instruction cache or not is checked, and whether an instruction prefetching request is sent to a next-stage storage system or not is determined according to an inquiry result. According to the invention, port contention between the instruction prefetching query and other instruction cache related operations can be avoided; the instruction cache utilization rate is improved; and the processor performance isfurther improved.

Description

technical field [0001] The invention relates to the technical field of modern microprocessor design, in particular to an instruction prefetch filtering method. Background technique [0002] The instruction cache is a key resource in modern high-performance processors, and the design of the instruction fetch pipeline mainly revolves around the instruction cache. In order to improve the utilization rate of the instruction cache and reduce the missing of instruction fetch and query, the instruction prefetching technology is often used to preload the instruction cache line to be used into the instruction cache in advance. Before issuing a prefetch request, first determine whether the prefetched Cache line is already in the instruction cache, so you need to use the prefetch address to query the instruction cache. If the Cache line to be prefetched has been loaded, you do not need to issue a prefetch request. [0003] In high-performance processors, the instruction cache has a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/38G06F12/1027
CPCG06F9/3814G06F12/1027Y02D10/00
Inventor 王国澎
Owner 上海高性能集成电路设计中心
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