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    • 34. 发明申请
    • ENABLING AND DISABLING A SECOND JUMP EXECUTION UNIT FOR BRANCH MISPREDICTION
    • 启用和禁用分支机构错误预测的第二个执行单位
    • US20140156977A1
    • 2014-06-05
    • US13994699
    • 2011-12-28
    • Mark J. DecheneMatthew C. MertenSean P. Mirkes
    • Mark J. DecheneMatthew C. MertenSean P. Mirkes
    • G06F9/38
    • G06F9/3861G06F9/3844G06F9/3851G06F9/3885
    • Techniques are described for enabling and/or disabling a secondary jump execution unit (JEU) in a micro-processor. The secondary JEU is incorporated in the micro-processor to operate concurrently with a primary JEU, and to enable the handling of simultaneous branch mispredicts on multiple branches. Activation and deactivation of the secondary JEU may be controlled by a pressure counter or a confidence counter. A pressure counter mechanism increments a count for each branch operation executed within the processor and decrements the count by a decay value during each cycle. A confidence counter mechanism increments a count for each correctly predicted branch, and decrements the count for each mispredict. Each counter signals an activation component, such as a port binding hardware component, to begin binding micro-operations to the secondary JEU when the counter exceeds an activation threshold. The counter mechanism may be thread-agnostic or thread-specific.
    • 描述了在微处理器中启用和/或禁用辅助跳转执行单元(JEU)的技术。 次级JEU被并入微处理器以与主JEU同时操作,并且能够在多个分支上处理同时的分支错误预测。 次级JEU的激活和停用可以由压力计数器或置信计数器来控制。 压力计数器机构增加在处理器内执行的每个分支操作的计数,并在每个周期期间将计数减去衰减值。 置信度计数机制增加每个正确预测分支的计数,并减少每个错误预测的计数。 当计数器超过激活阈值时,每个计数器发出一个激活组件,例如端口绑定硬件组件,开始将微操作绑定到辅助JEU。 计数器机制可能是线程不可知或线程特定的。