Definition

out-of-order execution (OoOE)

Out-of-order execution (OoOE) is an approach to processing that allows instructions for high-performance microprocessors to begin execution as soon as their operands are ready. Although instructions are issued in-order, they can proceed out-of- order with respect to each other. The goal of OoO processing is to allow the processor to avoid a class of stalls that occur when the data needed to perform an operation are unavailable.

This was last updated in April 2012
Posted by: Margaret Rouse

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