发明授权
US06687789B1 Cache which provides partial tags from non-predicted ways to direct search if way prediction misses
有权
从非预测方式提供部分标签的缓存,如果方式预测错失,则直接搜索
- 专利标题: Cache which provides partial tags from non-predicted ways to direct search if way prediction misses
- 专利标题(中): 从非预测方式提供部分标签的缓存,如果方式预测错失,则直接搜索
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申请号: US09476577申请日: 2000-01-03
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公开(公告)号: US06687789B1公开(公告)日: 2004-02-03
- 发明人: James B. Keller , Keith R. Schakel , Puneet Sharma
- 申请人: James B. Keller , Keith R. Schakel , Puneet Sharma
- 主分类号: G06F1200
- IPC分类号: G06F1200
摘要:
A cache is coupled to receive an input address and a corresponding way prediction. The cache provides output bytes in response to the predicted way (instead of, performing tag comparisons to select the output bytes). Furthermore, a tag may be read from the predicted way and only partial tags are read from the non-predicted ways. The tag is compared to the tag portion of the input address, and the partial tags are compared to a corresponding partial tag portion of the input address. If the tag matches the tag portion of the input address, a hit in the predicted way is detected and the bytes provided in response to the predicted way are correct. If the tag does not match the tag portion of the input address, a miss in the predicted way is detected. If none of the partial tags match the corresponding partial tag portion of the input address, a miss in the cache is determined. On the other hand, if one or more of the partial tags match the corresponding partial tags portion of the input address, the cache searches the corresponding ways to determine whether or not the input address hits or misses in the cache.
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