Invention Grant
US07904705B2 System and method for repairing a speculative global history record
有权
用于修复投机性全球历史记录的系统和方法
- Patent Title: System and method for repairing a speculative global history record
- Patent Title (中): 用于修复投机性全球历史记录的系统和方法
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Application No.: US12722220Application Date: 2010-03-11
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Publication No.: US07904705B2Publication Date: 2011-03-08
- Inventor: Timothy A. Olson , Terrence Matthew Potter , Jon A. Loschke
- Applicant: Timothy A. Olson , Terrence Matthew Potter , Jon A. Loschke
- Applicant Address: US CA San Diego
- Assignee: Applied Micro Circuits Corporation
- Current Assignee: Applied Micro Circuits Corporation
- Current Assignee Address: US CA San Diego
- Agency: Law Office of Gerald Maliszewski
- Agent Gerald Maliszewski
- Main IPC: G06F9/00
- IPC: G06F9/00

Abstract:
A system and method are provided for updating a speculative global history prediction record in a microprocessor system using pipelined instruction processing. The method accepts microprocessor instructions with consecutive operations, including a conditional branch operation with an associated first branch address. A speculative global history record (SGHR) of conditional branch resolutions and predictions is accessed and hashed with the first branch address, creating a first hash result. The first hash result is used to index a branch history table (BHT) of previous first branch resolutions. As a result, a first branch prediction is made, and the SGHR is updated with the first branch prediction. A non-speculative global history record (NSGHR) of branch resolutions is updated with the resolution of the first branch operation, and if the first branch prediction is incorrect, the SGHR is corrected using the NSGHR.
Public/Granted literature
- US20100169627A1 System and method for repairing a speculative global history record Public/Granted day:2010-07-01
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