Branch prediction with added selector bits to increase branch prediction capacity and flexibility with minimal added bits
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United States of America Patent
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Aug 22, 2000
Grant Date -
N/A
app pub date -
Dec 19, 1997
filing date -
Dec 19, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A branch prediction unit stores as set of branch selectors corresponding to each of a group of contiguous instruction bytes stored in an instruction cache. Each branch selector identifies a branch prediction to be selected if a fetch address corresponding to that branch selector is presented. The branch prediction unit additionally stores a set of return selectors corresponding to one or more branch predictions. The return selectors identify the type of branch selection. For example, the branch predictions may include a sequential branch prediction and a branch instruction branch prediction. The return selectors may identify whether the branch instruction branch prediction is associated with the return instruction or a non-return branch instruction.
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