What is VLIW processor?

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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 epic in DSP?

EPIC permits microprocessors to execute software instructions in parallel by using the compiler, rather than complex on-die circuitry, to control parallel instruction execution. This was intended to allow simple performance scaling without resorting to higher clock frequencies.

What is epic in computers?

Definition. Explicitly Parallel Instruction Computing (EPIC) refers to architectures in which features are provided to facilitate compiler enhancements of instruction-level parallelism (ILP) in all programs, while keeping hardware complexity relatively low.

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What are the advantages of VLIW processor?

Advantages of VLIW are:

  • Performance similar to CISC and RISC.
  • Reduced hardware complexity over a superscalar implementation.
  • Uses instruction level parallelism to the fullest.
  • VLIW is a simpler way to build a superscalar microprocessor.

Where is VLIW used?

Outside embedded processing markets, Intel’s Itanium IA-64 explicitly parallel instruction computing (EPIC) and Elbrus 2000 appear as the only examples of a widely used VLIW CPU architectures.

Is epic a type of processor architecture?

EPIC (Explicitly Parallel Instruction Computing) is a 64-bit microprocessor instruction set, jointly defined and designed by Hewlett Packard and Intel, that provides up to 128 general and floating point unit registers and uses speculative loading, predication, and explicit parallelism to accomplish its computing tasks.

Who invented VLIW architecture?

Josh Fisher
The concept of VLIW architecture, and the term VLIW, were invented by Josh Fisher in his research group at Yale University in the early 1980s.

What is the basic difference between super scalar and VLIW computers?

Both superscalar and VLIW architectures are capable of executing multiple instructions at one cycle. Each uses a different method for instruction scheduling. While superscalar processors execute instructions dynamically, VLIW uses static scheduling of program instructions.

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What is the advantage of VLIW CPU over superscalar?

The big advantage of VLIW, then, is that a highly concurrent (parallel) implementation is much simpler and cheaper to build than equivalently concurrent RISC or CISC chips. VLIW is a simpler way to build a superscalar microprocessor .

What is an Itanium based system?

Itanium (/aɪˈteɪniəm/ eye-TAY-nee-əm) is a discontinued family of 64-bit Intel microprocessors that implement the Intel Itanium architecture (formerly called IA-64). Itanium-based systems were produced by HP/Hewlett Packard Enterprise (HPE) (the HPE Integrity Servers line) and several other manufacturers.

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.