Selective accumulation and use of predicting unit

专利名称：Selective accumulation and use of predicting

unit history

发明人：Rodney E. Hooker,Terry Parks,John Michael

Greer

申请号：US141653申请日：20140127公开号：US09507597B2公开日：20161129

专利附图：

摘要：A microprocessor includes a predicting unit and a control unit. The control unitcontrols the predicting unit to accumulate a history of characteristics of executed

instructions and makes predictions related to subsequent instructions based on thehistory while the microprocessor is running a first thread. The control unit also detects atransition from running the first thread to running a second thread and controls thepredicting unit to selectively suspend accumulating the history and making the

predictions using the history while running the second thread. The predicting unit makesstatic predictions while running the second thread. The selectivity may be based on theprivilege level, identity or length of the second thread, static prediction effectivenessduring a previous execution instance of the thread, whether the transition was made dueto a system call, and whether the second thread is an interrupt handler.

申请人：VIA TECHNOLOGIES, INC.

地址：New Taipei TW

国籍：TW

代理人：E. Alan Davis,James W. Huffman

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