System and method for a multi-schema branch predictor
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United States of America Patent
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Jun 14, 2016
Grant Date -
Jul 1, 2010
app pub date -
Nov 9, 2009
filing date -
Dec 25, 2008
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Abstract
A system and method for predicting the execution of a branch of computer-executable instructions. In an embodiment, a branch predictor may include a program-counter register operable to store a program-counter value and a branch-history register operable to store a branch-history value. Additionally, the branch predictor may include a prediction hash table having a plurality of prediction values each uniquely corresponding to a plurality of memory locations. With these components, the branch predictor may generate a first prediction value that corresponds to the program-counter value and may generate a second prediction value that corresponds to a logical combination of the program-counter value and the branch-history value. With these two prediction values obtained from two different prediction schemas, the branch predictor is better suited to generate an overall prediction value based on the first and second prediction values that is more accurate than a single prediction value based upon a single prediction schema.
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