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  2. Branch predictor - Wikipedia

    en.wikipedia.org/wiki/Branch_predictor

    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.

  3. Talk:Branch predictor - Wikipedia

    en.wikipedia.org/wiki/Talk:Branch_predictor

    From Branch Predictor article Two-level adaptive predictor "Assume, for example, that a conditional jump is taken every third time. The branch sequence is 001001001... In this case, entry number 00 in the pattern history table will go to state "strongly taken", indicating that after two zeroes comes a one.

  4. Predication (computer architecture) - Wikipedia

    en.wikipedia.org/wiki/Predication_(computer...

    With predication, all possible branch paths are coded inline, but some instructions execute while others do not. The basic idea is that each instruction is associated with a predicate (the word here used similarly to its usage in predicate logic) and that the instruction will only be executed if the predicate is true.

  5. Branch (computer science) - Wikipedia

    en.wikipedia.org/wiki/Branch_(computer_science)

    Historically, branch prediction took statistics, and used the result to optimize code. A programmer would compile a test version of a program, and run it with test data. The test code counted how the branches were actually taken. The statistics from the test code were then used by the compiler to optimize the branches of released code.

  6. Speculative execution - Wikipedia

    en.wikipedia.org/wiki/Speculative_execution

    This approach is employed in a variety of areas, including branch prediction in pipelined processors, value prediction for exploiting value locality, prefetching memory and files, and optimistic concurrency control in database systems. [1] [2] [3] Speculative multithreading is a special case of speculative execution.

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