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Branch prediction using multi-way pattern history table (PHT) and global path vector (GPV)
Branch prediction using multi-way pattern history table (PHT) and global path vector (GPV)
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机译:使用多路模式历史记录表(PHT)和全局路径矢量(GPV)进行分支预测
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摘要
Embodiments relate to branch prediction using a pattern history table (PHT) that is indexed using a global path vector (GPV). An aspect includes receiving a search address by a branch prediction logic that is in communication with the PHT and the GPV. Another aspect includes starting with the search address, simultaneously determining a plurality of branch predictions by the branch prediction logic based on the PHT, wherein the plurality of branch predictions comprises one of: (i) at least one not taken prediction and a single taken prediction, and (ii) a plurality of not taken predictions. Another aspect includes updating the GPV by shifting an instruction identifier of a branch instruction associated with a taken prediction into the GPV, wherein the GPV is not updated based on any not taken prediction.
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