发明授权
US07434037B2 System for target branch prediction using correlation of local target histories including update inhibition for inefficient entries
失效
使用本地目标历史的相关性进行目标分支预测的系统,包括无效率条目的更新抑制
- 专利标题: System for target branch prediction using correlation of local target histories including update inhibition for inefficient entries
- 专利标题(中): 使用本地目标历史的相关性进行目标分支预测的系统,包括无效率条目的更新抑制
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申请号: US11399979申请日: 2006-04-07
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公开(公告)号: US07434037B2公开(公告)日: 2008-10-07
- 发明人: Il Park , Mauricio J. Serrano , Jong-Deok Choi
- 申请人: Il Park , Mauricio J. Serrano , Jong-Deok Choi
- 申请人地址: US NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: US NY Armonk
- 代理商 Michael J. Buchenhorner; Douglas W. Cameron
- 主分类号: G06F9/32
- IPC分类号: G06F9/32
摘要:
An information processing system includes a branch target buffer (BTB) comprising the last next address for the instruction and for receiving an indirect instruction address and providing a BTB predicted target; and next branch target table (NBTT) for storing potential branch targets based on a history of the branch and for providing an NBTT when the a BTB predicted target is not successful. In another embodiment a system comprising a plurality of branch prediction resources dynamically predicts the best resource appropriate for a branch. The method includes predicting a target branch for an indirect instruction address using a resource chosen among the plurality of branch prediction resources; and selectively inhibiting updates of the branch prediction resources whose prediction accuracy does not meet a threshold.
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