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Reference.org
Out-of-order execution
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<p>In <a href="/facts/Computer_engineering/5x1TRKGo">computer engineering</a>, out-of-order execution (or more formally dynamic execution) is an <a href="/facts/Instruction_scheduling/5GuldkLY">instruction scheduling</a> paradigm used in high-performance <a href="/facts/Central_processing_unit/Jxp1bqMV">central processing units</a> to make use of <a href="/facts/Instruction_cycle/uYmJEfHK">instruction cycles</a> that would otherwise be wasted. In this paradigm, a processor executes <a href="/facts/Instruction_(computing)/8p8vwUeE">instructions</a> in an order governed by the availability of input data and execution units, rather than by their original order in a program. In doing so, the processor can avoid being idle while waiting for the preceding instruction to complete and can, in the meantime, process the next instructions that are able to run immediately and independently. </p>