Fetch ahead branch target buffer
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United States of America Patent
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May 26, 2020
Grant Date -
May 11, 2017
app pub date -
Nov 9, 2015
filing date -
Nov 9, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A fetch ahead branch target buffer is used by a branch predictor to determine a target address for a branch instruction based on a fetch pointer for a previous fetch bundle, i.e. a fetch bundle which is fetched prior to a fetch bundle which includes the branch instruction. An entry in the fetch ahead branch target buffer corresponds to one branch instruction and comprises a data portion identifying the target address of that branch instruction. In various examples, an entry also comprises a tag portion which stores data identifying the fetch pointer by which the entry is indexed. Branch prediction is performed by matching an index generated using a received fetch pointer to the tag portions to identify a matching entry and then determining the target address for the branch instruction from the data portion of the matching entry.
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