发明申请
- 专利标题: Partial Flush Handling with Multiple Branches Per Group
- 专利标题(中): 部分冲洗处理与每个分支
-
申请号: US12423495申请日: 2009-04-14
-
公开(公告)号: US20100262807A1公开(公告)日: 2010-10-14
- 发明人: William E. Burky , Brian R. Mestan , Dung Q. Nguyen , Balaram Sinharoy , Benjamin W. Stolt
- 申请人: William E. Burky , Brian R. Mestan , Dung Q. Nguyen , Balaram Sinharoy , Benjamin W. Stolt
- 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
- 主分类号: G06F9/38
- IPC分类号: G06F9/38 ; G06F9/30
摘要:
Mechanisms are provided for partial flush handling with multiple branches per instruction group. The instruction fetch unit sorts instructions into groups. A group may include a floating branch instruction and a boundary branch instruction. For each group of instructions, the instruction sequencing unit creates an entry in a global completion table (GCT), which may also be referred to herein as a group completion table. The instruction sequencing unit uses the GCT to manage completion of instructions within each outstanding group. Because each group may include up to two branches, the instruction sequencing unit may dispatch instructions beyond the first branch, i.e. the floating branch. Therefore, if the floating branch results in a misprediction, the processor performs a partial flush of that group, as well as a flush of every group younger than that group.