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The general rule for a two-level adaptive predictor with an n-bit history is that it can predict any repetitive sequence with any period if all n-bit sub-sequences are different. [8] The advantage of the two-level adaptive predictor is that it can quickly learn to predict an arbitrary repetitive pattern.
The local predictor is a two-level table which records the history of individual branches. It consists of a 1,024-entry by 10-bit branch history table. A two-level table was used as the prediction accuracy is similar to that of a larger single-level table while requiring fewer bits of storage. It has a 1,024-entry branch prediction table.
2014 (For MICRO 1991) Two-Level Branch Predictor; 2014 (For MICRO 1982) MIPS: A Microprocessor Architecture; 2014 (For MICRO 1981) Some Scheduling Techniques and An Easily Schedulable Horizontal Architecture for High Performance Scientific Computing; 2014 (For MICRO 1978) Microprogrammed Implementation of A Single Chip Microprocessor
The general rule for a two-level adaptive predictor with an n-bit history is that it can predict any repetitive sequence with any period if all n-bit sub-sequences are different.[8] The advantage of the two-level adaptive predictor is that it can quickly learn to predict an arbitrary repetitive pattern.
The front-end had significantly more stages than previous Alpha implementation and as a result, the 21464 had a significant minimum branch misprediction penalty of 14 cycles. [1] The microprocessor used an advanced branch prediction algorithm to minimize these costly penalties.
Superscalar, branch prediction PowerPC e500: Dual 7 stage Multi-core PowerPC e600: 3-issue 7 stage Superscalar out-of-order execution, branch prediction PowerPC e5500: 2010 4-issue 7 stage Out-of-order, multi-core PowerPC e6500: 2012 Multi-core PowerPC 603: 4 5 execution units, branch prediction, no SMP PowerPC 603q: 1996 5 In-order PowerPC 604 ...
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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.