In computer engineering, out-of-order execution (OoOE or OOE) is a paradigm used in most high-performance microprocessors to make use of instruction cycles that would otherwise be wasted by a certain type of costly delay. In this paradigm, a processor executes instructions in an order governed by the availability of input data, rather than by their original order in a program. In doing so, the processor can avoid being idle while data is retrieved for the next instruction in a program, processing instead the next instructions which are able to run immediately.
Read more about Out-of-order Execution: History, Dispatch and Issue Decoupling Allows Out-of-order Issue, Execute and Writeback Decoupling Allows Program Restart, Micro-architectural Choices
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