Iron law of processor performance

In computer architecture, the iron law of processor performance describes the performance trade-off between complexity and the number of primitive instructions that processors use to perform calculations. This formulation of the trade-off spurred the development of Reduced Instruction Set Computers (RISC) whose instruction set architectures (ISAs) leverage a smaller set of core instructions to improve performance. The term was coined by Douglas Clark based on research performed by Clark and Joel Emer in the 1980s.

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