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    • 9. 发明授权
    • Performance of processors is improved by limiting number of branch prediction levels
    • 通过限制分支预测级别的数量来提高处理器的性能
    • US09582284B2
    • 2017-02-28
    • US13308696
    • 2011-12-01
    • Robert H. Bell, Jr.Wen-Tzer T. Chen
    • Robert H. Bell, Jr.Wen-Tzer T. Chen
    • G06F9/38G06F11/30
    • G06F9/3844G06F9/3842G06F11/30G06F11/3024G06F11/3409G06F2201/81
    • A method utilizes information provided by performance monitoring hardware to dynamically adjust the number of levels of speculative branch predictions allowed (typically 3 or 4 per thread) for a processor core. The information includes cycles-per-instruction (CPI) for the processor core and number of memory accesses per unit time. If the CPI is below a CPI threshold; and the number of memory accesses (NMA) per unit time is above a prescribed threshold, the number of levels of speculative branch predictions is reduced per thread for the processor core. Likewise, the number of levels of speculative branch predictions could be increased, from a low level to maximum allowed, if the CPI threshold is exceeded or the number of memory accesses per unit time is below the prescribed threshold.
    • 一种方法利用由性能监视硬件提供的信息来动态调整对于处理器核心允许的推测分支预测级别(通常为每线程3或4个)。 该信息包括处理器核心的每个指令周期(CPI)和每单位时间的存储器访问次数。 如果CPI低于CPI阈值; 并且每单位时间的存储器访问次数(NMA)高于规定的阈值,则对于处理器核,每个线程的推测分支预测的级别数量减少。 同样地,如果超过CPI阈值或每单位时间的存储器访问次数低于规定的阈值,则可以将推测分支预测的级数从低级别增加到允许的最大级别。