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Circuits, systems and methods for performing branch predictions by selectively accessing bimodal and fetch-based history tables
Circuits, systems and methods for performing branch predictions by selectively accessing bimodal and fetch-based history tables
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机译：通过选择性地访问双峰和基于访存的历史表来执行分支预测的电路，系统和方法
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摘要
Branch prediction circuitry including a bimodal branch history table, a fetch-based branch history table and a selector table is provided. The local branch history table includes a plurality of entries each for storing a prediction value and accessed by selected bits of a branch address. The fetch-based branch history table included a plurality of entries for storing a prediction value and accessed by a pointer generated from selected bits of the branch address and bits from a history register. The selector table includes a plurality of entries each for storing a selection bit and accessed by a pointer generated from selected bits from the branch address and bits from the history register, each selector bit is used for selecting between a prediction value accessed from the local history table and a prediction value accessed from the fetch-based history table.
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