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Very Long Instruction Word (VLIW) architectures rely on compile-time detection of parallelism; this implies the compiler analyses the program and detects operations to be executed in parallel; such operations are packed into one “large” instruction.

After one instruction has been fetched all the corresponding operations are issued in parallel. No hardware is needed for run-time detection of parallelism. 

Advantages of the Very Long Instruction Word (VLIW) architecture;

- Simple architecture 

- Each instruction word contains several instructions that are not dependent on each other, therefore you don’t need a large window of execution.

- The whole program is available at compile time so you can look through the program to determine dependencies.

Disadvantages of the Very Long Instruction Word (VLIW) architecture;

- Large code size after compilation

- Dependencies are detected at compile time which is not as good as in superscalar.

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