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Figure from:

"Understanding Sources of Inefficiency in General-Purpose Chips". Hameed et al. ISCA 2010.


This is like Amdahl's law. The red block is the portion that has been optimized but it doesn't make a big difference if that portion is a small part of the total set.


VLIW = Very Long Instruction Word refers to instruction set architectures designed to exploit instruction level parallelism (ILP).