Invention Grant
US07991979B2 Issuing load-dependent instructions in an issue queue in a processing unit of a data processing system
有权
在数据处理系统的处理单元中的发布队列中发出与负载相关的指令
- Patent Title: Issuing load-dependent instructions in an issue queue in a processing unit of a data processing system
- Patent Title (中): 在数据处理系统的处理单元中的发布队列中发出与负载相关的指令
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Application No.: US12236175Application Date: 2008-09-23
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Publication No.: US07991979B2Publication Date: 2011-08-02
- Inventor: Christopher M. Abernathy , Mary D Brown , William E. Burky , Todd A. Venton
- Applicant: Christopher M. Abernathy , Mary D Brown , William E. Burky , Todd A. Venton
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Dillon & Yudell LLP
- Main IPC: G06F9/30
- IPC: G06F9/30

Abstract:
A system and method for issuing load-dependent instructions in an issue queue in a processing unit. A load miss queue is provided. The load miss queue comprises a physical address field, an issue queue position field, a valid identifier field, a source identifier field, and a data type field. A load instruction that misses a first level cache is dispatched, and both the physical address field and the data type field are set. A load-dependent instruction is identified. In response to identifying the load-dependent instruction, each of the issue queue position field, valid identifier field, and source identifier field are set. If the issue queue position field refers to a flushed instruction, the valid identifier field is cleared. The load instruction is recycled, and a value of the valid identifier field is determined. The load-dependent instruction is then selected for issue on a next processing cycle independent of an age of the load-dependent instruction.
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