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A two-level adaptive predictor with globally shared history buffer and pattern history table is called a "gshare" predictor if it xors the global history and branch PC, and "gselect" if it concatenates them. Global branch prediction is used in AMD processors, and in Intel Pentium M, Core, Core 2, and Silvermont-based Atom processors.
Good references on 2-level branch predictors: A Comparison of Dynamic Branch Predictors that use Two Levels of Branch History, by Yeh and Patt, 1993 (I've found it online as p257-yeh.pdf) Alternative Implementations of Two-Level Adaptive Branch Prediction, by Yeh and Patt, 1992 (p451-yeh.pdf)
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Elimination of unnecessary branch instructions can make the execution of necessary branches, such as those that make up loops, faster by lessening the load on branch prediction mechanisms. Elimination of the cost of a branch misprediction which can be high on deeply pipelined architectures.