What is the difference between VLIW and superscalar processor?
A superscalar processor is invented to produce an execution cost of higher than one instruction per clock cycle for an individual sequential program….Superscalar Processor.
| VLIW Architecture | Superscalar Processor |
|---|---|
| VLIW is used for static scheduling. | Superscalar is used for dynamic scheduling. |
What is VLIW processor?
Very long instruction word (VLIW) describes a computer processing architecture in which a language compiler or pre-processor breaks program instruction down into basic operations that can be performed by the processor in parallel (that is, at the same time).
What is the advantage of VLIW CPU over superscalar?
Advantages of VLIW are: Performance similar to CISC and RISC. Reduced hardware complexity over a superscalar implementation. Uses instruction level parallelism to the fullest.
Is Intel i7 a superscalar?
A typical superscalar processor today is the Intel Core i7 processor based on the Nehalem microarchitecture. There are multiple processor cores in a Core i7 design, where each processor core is a superscalar processor.
What are the limitations of superscalar?
Just like the hazards in pipeline, superscalar has limitations too. dependency, procedural dependency, resource conflict, output dependency, and anti- dependency.
What is a superscalar processor characteristics?
A superscalar processor is a mixture of the two. Each instruction processes one data item, but there are multiple execution units within each CPU thus multiple instructions can be processing separate data items concurrently.
What is meant by superscalar processor?
A superscalar processor is a CPU that implements a form of parallelism called instruction-level parallelism within a single processor.
Is VLIW used today?
These contemporary VLIW CPUs are mainly successful as embedded media processors for consumer electronic devices. VLIW features have also been added to configurable processor cores for system-on-a-chip (SoC) designs.
What are the disadvantages of VLIW architecture?
Complex compilers are required which are hard to design. Increased program code size. Larger memory bandwidth and register-file bandwidth. Unscheduled events, for example a cache miss could lead to a stall which will stall the entire processor.
What is the limitation of VLIW?
VLIW has been perceived as suffering from important limitations, such as the need for a powerful compiler, increased code size arising from aggresive scheduling policies, larger memory bandwidth and register-file bandwidth, limitations due to the lock-step operation, binary compatibility across implementations with …
Why do we need superscalar processor?
Superscalar CPU design emphasizes improving the instruction dispatcher accuracy, and allowing it to keep the multiple execution units in use at all times. This has become increasingly important as the number of units has increased.
How superscalar achieves the speedup?
In a superscalar computer, the central processing unit (CPU) manages multiple instruction pipelines to execute several instructions concurrently during a clock cycle. This is achieved by feeding the different pipelines through a number of execution units within the processor.
What is the difference between superscalar processors and VLIW?
While superscalar processors execute instructions dynamically, VLIW uses static scheduling of program instructions. A superscalar processor is a microprocessor design for exploiting multiple instructions in one clock cycle, thus establishing an instruction-level parallelism in processors.
What are the limitations of the superscalar processor?
The limitations of the Superscalar processor are prominent as the difficulty of scheduling instruction becomes complex. The intrinsic parallelism in the instruction stream, complexity, cost, and the branch instruction issue get resolved by a higher instruction set architecture called the Very Long Instruction Word (VLIW) or VLIW Machines.
What is a superscalar architecture?
A superscalar architecture consists of parallel execution units, which can execute instructions at the same time. This parallel architecture was first executed in RISC processors, which use brief and simple instructions to implement computation.
What is the difference between VLIW and central processing unit processors?
Central processing unit processors enable programs to designate instructions to execute in order only whereas a VLIW processor enables programs to explicitly determine instructions to implement in parallel. This design is designed to enable higher implementation without the complexity inherent in some different designs.