在Tomasulo算法中，重排序缓冲区（英语：re-order buffer, ROB）)可以使指令在乱序执行，之后按照原有顺序提交。

在最初的动态调度乱序执行机制中，主要分三个阶段：发射（issue）、执行（execute）和写结果（write Result）。Tomasulo算法则增加了一个被称为“提交（Commit）”的过程。在写结果阶段，指令的结果暂时被存储在重排序缓冲区中。随后，指令执行的结果再被储存在寄存器或主存储器中。如果其他指令急切需要此结果，那幺重排序缓冲区可以直接为其传输所需的数据。

A re-order buffer (ROB) is used in a Tomasulo algorithm for out-of-order instruction execution. It allows instructions to be committed in-order.

Normally, there are three stages of instructions: "Issue", "Execute", "Write Result". In Tomasulo algorithm, there is an additional stage "Commit". In this stage, the results of instructions will be stored in a register or memory. In the "Write Result" stage, the results are just put in the re-order buffer. All contents in this buffer can then be used when executing other instructions depending on these.