A reorder buffer is a hardware mechanism that helps maintain the correct order of instruction execution in out-of-order execution architectures. It allows instructions to be executed as resources become available, while still ensuring that results are committed in the original program order, which is essential for maintaining data consistency and program correctness. This mechanism is crucial for dynamic scheduling, advanced pipeline optimizations, and speculative execution, as it allows processors to take advantage of instruction-level parallelism without sacrificing the integrity of program execution.
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