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Definition of "lookahead" |
for conditional branches, a strategy for choosing a probable outcome of the decision that must be made at a conditional branch, even though the conditions are not known yet, and initiates “speculative” execution of the instructions along the corresponding control path through the program. If the chosen outcome turns out to be incorrect, all effects of the speculative instructions must be erased (or, alternately, the effects are not stored until it has been determined that the choice was correct). Some lookahead mechanisms attempt execution of both possibilities from a conditional branch, and otherswill cascade lookahead choices from several conditional branches that occur in close proximity in the program flow. |
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