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Talk:Instruction-level parallelism

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Hi:

The 1st sentence of the last paragraph of instruction level parallelism says "As of 2004, the computer industry has hit a roadblock in getting further performance gains from ILP". I wondering what roadblock refers to. Does it refer to software techniques or hardware techniques? From which papers/reports/experiences/perspectives, the author made this assumption? I am a student and curious about it.

Thanks very much!

John