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  2. Tomasulo's algorithm - Wikipedia

    en.wikipedia.org/wiki/Tomasulo's_algorithm

    Tomasulo's algorithm uses register renaming to correctly perform out-of-order execution. All general-purpose and reservation station registers hold either a real value or a placeholder value. If a real value is unavailable to a destination register during the issue stage, a placeholder value is initially used.

  3. Register renaming - Wikipedia

    en.wikipedia.org/wiki/Register_renaming

    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 POWER1 from 1990 is the first microprocessor that used register renaming and out-of-order execution. This processor implemented register renaming only for floating-point loads.

  4. Loop unrolling - Wikipedia

    en.wikipedia.org/wiki/Loop_unrolling

    On hardware where software pipelining is necessary to improve performance alongside loop unrolling (i.e. hardware which lacks register renaming or implements in-order superscalar execution), additional registers may need to be used to store temporary variables from multiple iterations that could otherwise reuse the same register. [7]

  5. Hazard (computer architecture) - Wikipedia

    en.wikipedia.org/wiki/Hazard_(computer_architecture)

    the Tomasulo algorithm, which uses register renaming, allowing continual issuing of instructions The task of removing data dependencies can be delegated to the compiler, which can fill in an appropriate number of NOP instructions between dependent instructions to ensure correct operation, or re-order instructions where possible.

  6. Scoreboarding - Wikipedia

    en.wikipedia.org/wiki/Scoreboarding

    F i: Destination register; F j,F k: Source-register numbers; Q j,Q k: Functional units that will produce the source registers F j, F k; R j,R k: Flags that indicates when F j, F k are ready for and are not yet read. Register Status: Indicates, for each register, which function unit will write results into it.

  7. High-level synthesis - Wikipedia

    en.wikipedia.org/wiki/High-level_synthesis

    High-level synthesis (HLS), sometimes referred to as C synthesis, electronic system-level (ESL) synthesis, algorithmic synthesis, or behavioral synthesis, is an automated design process that takes an abstract behavioral specification of a digital system and finds a register-transfer level structure that realizes the given behavior.

  8. Instruction register - Wikipedia

    en.wikipedia.org/wiki/Instruction_register

    In computing, the instruction register (IR) or current instruction register (CIR) is the part of a CPU's control unit that holds the instruction currently being executed or decoded. [1] In simple processors, each instruction to be executed is loaded into the instruction register, which holds it while it is decoded, prepared and ultimately ...

  9. Register window - Wikipedia

    en.wikipedia.org/wiki/Register_window

    Example of a 4-window register window system. In computer engineering, register windows are a feature which dedicates registers to a subroutine by dynamically aliasing a subset of internal registers to fixed, programmer-visible registers. Register windows are implemented to improve the performance of a processor by reducing the number of stack ...

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