Browse Definitions :
Definition

VLIW (very long instruction word)

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). These operations are put into a very long instruction word which the processor can then take apart without further analysis, handing each operation to an appropriate functional unit.

VLIW is sometimes viewed as the next step beyond the reduced instruction set computing ( RISC ) architecture, which also works with a limited set of relatively basic instructions and can usually execute more than one instruction at a time (a characteristic referred to as superscalar ). The main advantage of VLIW processors is that complexity is moved from the hardware to the software, which means that the hardware can be smaller, cheaper, and require less power to operate. The challenge is to design a compiler or pre-processor that is intelligent enough to decide how to build the very long instruction words. If dynamic pre-processing is done as the program is run, performance may be a concern.

The Crusoe family of processors from Transmeta uses very long instruction words that are assembled by a pre-processor that is located in a flash memory chip. Because the processor does not need to have the ability to discover and schedule parallel operations, the processor contains only about a fourth of the transistor s of a regular processor. The lower power requirement enables computers based on Crusoe technology to be operated by battery almost all day without a recharge. The Crusoe processors emulate Intel's x86 processor instruction set. Theoretically, pre-processors could be designed to emulate other processor architectures.

This was last updated in March 2011
Networking
  • Network as a Service (NaaS)

    Network as a service, or NaaS, is a business model for delivering enterprise WAN services virtually on a subscription basis.

  • network configuration management (NCM)

    Network configuration management is the process of organizing and maintaining information about all of the components in a ...

  • presentation layer

    The presentation layer resides at Layer 6 of the Open Systems Interconnection (OSI) communications model and ensures that ...

Security
  • backdoor (computing)

    A backdoor attack is a means to access a computer system or encrypted data that bypasses the system's customary security ...

  • Heartbleed

    Heartbleed was a vulnerability in some implementations of OpenSSL, an open source cryptographic library.

  • What is risk management and why is it important?

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

CIO
HRSoftware
  • team collaboration

    Team collaboration is a communication and project management approach that emphasizes teamwork, innovative thinking and equal ...

  • employee self-service (ESS)

    Employee self-service (ESS) is a widely used human resources technology that enables employees to perform many job-related ...

  • learning experience platform (LXP)

    A learning experience platform (LXP) is an AI-driven peer learning experience platform delivered using software as a service (...

Customer Experience
  • headless commerce (headless e-commerce)

    Headless commerce, also called headless e-commerce, is a platform architecture that decouples the front end of an e-commerce ...

  • chief customer officer (CCO)

    A chief customer officer, or customer experience officer, is responsible for customer research, communicating with company ...

  • relationship marketing

    Relationship marketing is a facet of customer relationship management (CRM) that focuses on customer loyalty and long-term ...

Close