VLIW ( Very Long Instruction Word Computer Architecture)

VLIW ( Very Long Instruction Word Computer Architecture)

 ABSTRACT

VLIW architectures are distinct from traditional RISC and CISC architectures implemented in current mass-market microprocessors. It is important to distinguish instruction-set architecture—the processor programming model—from implementation—the physical chip and its characteristics.

VLIW microprocessors and superscalar implementations of traditional instruction sets share some characteristics—multiple execution units and the ability to execute multiple operations simultaneously. The techniques used to achieve high performance, however, are very different because the parallelism is explicit in VLIW instructions but must be discovered by hardware at run time by superscalar processors.

VLIW implementations are simpler for very high performance. Just as RISC  architectures permit simpler, cheaper high-performance implementations than do CISCs, VLIW architectures are simpler and cheaper than RISCs  because of further hardware simplifications. VLIW architectures, however, require more compiler support.

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