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simple instruction pipelining vs superscalar vs simultaneous multithreading

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  • Pipelining: Individual instructions are executed through a pipeline of stages so that while one instruction is executing in one stage of the pipeline, another instruction is executing in another stage of the pipeline.
  • Superscalar: Multiple pipelines are constructed by replicating execution resources. This enables parallel execution of instructions in parallel pipelines, so long as hazards are avoided.
  • Simultaneous multithreading (SMT): Register banks are replicated so that multiple threads can share the use of pipeline resources.

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