Very Long Instruction Word Architecture
Term Paper
Course code :CSE 211
Course title: Computer Organisation and Architecture
Submitted to: Ramanpreet Kaur Lamba Madam
Submitted by:
K. Nabachandra Singha
Very-Long Instruction Word (VLIW)
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.
INTRODUCTION AND MOTIVATION
Currently, in the mid 1990s, IC fabrication technology is advanced enough to allow unprecedented implementations of computer architectures on a single chip. Also, the current rate of process advancement allows implementations to be improved at a rate that is satisfying for most of the markets these implementations serve. In particular, the vendors of general-purpose microprocessors are competing for sockets in desktop personal computers (including workstations) by pushing the envelopes of clock rate (raw operating speed) and parallel execution.
The market for desktop microprocessors is proving to be extremely dynamic. In particular, the
Course code :CSE 211
Course title: Computer Organisation and Architecture
Submitted to: Ramanpreet Kaur Lamba Madam
Submitted by:
K. Nabachandra Singha
Very-Long Instruction Word (VLIW)
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.
INTRODUCTION AND MOTIVATION
Currently, in the mid 1990s, IC fabrication technology is advanced enough to allow unprecedented implementations of computer architectures on a single chip. Also, the current rate of process advancement allows implementations to be improved at a rate that is satisfying for most of the markets these implementations serve. In particular, the vendors of general-purpose microprocessors are competing for sockets in desktop personal computers (including workstations) by pushing the envelopes of clock rate (raw operating speed) and parallel execution.
The market for desktop microprocessors is proving to be extremely dynamic. In particular, the
Bibliography: en.wikipedia.org/wiki/very_long_instruction_word www.research.ibm.com/vliw