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    • 4. 发明授权
    • Systems and methods for locking branch target buffer entries
    • 用于锁定分支目标缓冲区条目的系统和方法
    • US09311099B2
    • 2016-04-12
    • US13955106
    • 2013-07-31
    • Jeffrey W. ScottWilliam C. Moyer
    • Jeffrey W. ScottWilliam C. Moyer
    • G06F9/22G06F9/38
    • G06F9/3806
    • A data processing system includes a processor configured to execute processor instructions and a branch target buffer having a plurality of entries. Each entry is configured to store a branch target address and a lock indicator, wherein the lock indicator indicates whether the entry is a candidate for replacement, and wherein the processor is configured to access the branch target buffer during execution of the processor instructions. The data processing system further includes control circuitry configured to determine a fullness level of the branch target buffer, wherein in response to the fullness level reaching a fullness threshold, the control circuitry is configured to assert the lock indicator of one or more of the plurality of entries to indicate that the one or more of the plurality of entries is not a candidate for replacement.
    • 数据处理系统包括被配置为执行处理器指令的处理器和具有多个条目的分支目标缓冲器。 每个条目被配置为存储分支目标地址和锁定指示符,其中所述锁定指示符指示所述条目是否是替换的候选,并且其中所述处理器被配置为在所述处理器指令的执行期间访问所述分支目标缓冲器。 数据处理系统还包括配置成确定分支目标缓冲器的饱和度水平的控制电路,其中响应于饱和度达到饱和阈值,控制电路被配置为断言多个 条目,以指示所述多个条目中的一个或多个条目不是替换候选者。