Memory locations can also be renamed, although it is not commonly done to the level used in register renaming.

This is the essential concept behind register renaming.

Very large architectural register files avoid the need for register renaming.

Below are described two styles of register renaming, distinguished by the circuit which holds data ready for an execution unit.

If programs refrained from reusing registers immediately, there would be no need for register renaming.

This algorithm differs from scoreboarding in that it utilizes register renaming.

Modern x86 CPUs get around some of these limitations by means of a trick called register renaming.

To avoid false operand dependencies, which would decrease the frequency when instructions could be issued out of order, a technique called register renaming is used.

The P6 microarchitecture was the first Intel based processor that implemented both out-of-order execution and register renaming.

The R10000 is a four-way superscalar design that implements register renaming and executes instructions out-of-order.

The Pentium Pro thus featured out of order execution, including speculative execution via register renaming.

The POWER1 is the first microprocessor that used register renaming and out-of-order execution in 1990.

This enables relatively good performance with only two integer ALUs, and without any instruction reordering, speculative execution, or register renaming.

The 6x86 and MII series did exactly this, but was more advanced; it implemented superscalar speculative execution via register renaming, directly at the x86-semantic level.

More complicated CPUs use register renaming, so that the mapping of which physical entry stores a particular architectural register changes dynamically during execution.

In spite of the benefits of register renaming, it would still be nicer to have more registers directly accessible to the programmer via the x86 ISA.

The 6x86 is superscalar and superpipelined and performs register renaming, speculative execution, out-of-order execution, and data dependency removal.

The IBM System/360 Model 91 was an early machine that supported out-of-order execution of instructions; it used the Tomasulo algorithm, which uses register renaming.

The general-purpose register file contains 48 registers, of which 32 are general-purpose registers and 16 are rename registers for register renaming.

A stack structure also makes superscalar implementations with register renaming (for speculative execution) somewhat more complex to implement, although it is still feasible, as exemplified by modern x87 implementations.

The IRB's purpose is the implement register renaming, out of order execution, speculative execution and to provide a temporary place for results to be stored until the instructions are retired.

Register renaming which refers to a technique used to avoid unnecessary serialization of program operations imposed by the reuse of registers by those operations, used to enable out-of-order execution.

Scoreboarding and the Tomasulo algorithm (which is similar to scoreboarding but makes use of register renaming) are two of the most common techniques for implementing out-of-order execution and instruction-level parallelism.

Reservation Stations are decentralized features of the microarchitecture of a CPU that allow for register renaming, and are used by the Tomasulo algorithm for dynamic instruction scheduling.

The integer register file was 64 bits wide and contained 64 entries, of which 32 were architectural registers and 32 were rename registers used to implement register renaming.