What are the differences between superscalar processor and VLIW 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. |
Is VLIW superscalar?
Superscalar and Very Long Instruction Word (VLIW) are parallel architectural models based on Flynn’s Taxonomy. Both superscalar and VLIW architectures are capable of executing multiple instructions at one cycle. Each uses a different method for instruction scheduling.
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.
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 basic principle of VLIW processor?
VLIW Architecture – Basic Principles These processors contain multiple functional units, fetch from the instruction cache a Very-Long Instruction Word containing several primitive instructions, and dispatch the entire VLIW for parallel execution.
What are the pros and cons of VLIW architecture?
VLIW has both advantages and disadvantages. The main advantage is the saving in hardware — the compiler now decides what can be executed in parallel, and the hardware just does it. There is no need to check for dependencies or decide on scheduling — the compiler has already resolved these issues.
Is VLIW a MIMD architecture?
VLIW stands for? Explanation: It is the architecture designed to perform multiple operations in parallel. Explanation: ILP stands for Instruction Level Parallelism. Explanation: The MIMD stands for Multiple Instructions Multiple Data.
What are the disadvantages of VLIW processors?
VLIW Advantages & Disadvantages (aot SS)
- Programmer/compiler complexity and longer compilation times.
- Lock step operation, i.e., on hazard all future issues stall until hazard is resolved (hence need for predication)
- Object (binary) code incompatibility.
- Needs lots of program memory bandwidth.
- Code bloat.
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 are the advantages of VLIW processor?
Advantages : Reduces hardware complexity. Reduces power consumption because of reduction of hardware complexity. Since compiler takes care of data dependency check, decoding, instruction issues, it becomes a lot simpler.
Why a processor is called superscalar?
With this arrangement, several instructions start execution in the same clock cycle and the process is said to use multiple issue. Such processors are capable of achieving an instruction execution throughput of more than one instruction per cycle. They are known as ‘Superscalar Processors’.
What are the advantages and disadvantages of VLIW architecture?