Supercompputer Branch Prediciton
Essay specific features
December 24, 2010
No of pages / words:
15 / 4193
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Branching impedes CPU performance in that conditional branches can’t be resolved until the condition is determined and the target address calculated. Likewise unconditional branches can’t be determined without calculating the address. As pipelines get deeper (longer) the penalty of incorrect branching grows...
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As pipelines get deeper (longer) the penalty of incorrect branching grows.
Many methods have been proposed and researched and the solution of the majority is based on variations of schemes that predict the direction of conditional branches and then pre-fetch, decode, and execute the instruction. If the prediction is incorrect a lot of the ‘speculative’ work will be tossed out...
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