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In this paper we describe "Lazy Retirement"-a power-aware improvement to the Intel's P6 family microarchitec-ture. Lazy Retirement significantly reduces the energy and power involved in register retirement. Lazy Retirement delays the copy from the physical register file (ROB) to the architectural (real) register file (RRF) until it has no choice and the… (More)
Inspired by the drawings of " impossible " objects by artists such as M.C. Escher, we describe a mathematical theory which captures some of the underlying principles of their work. Using this theory, we show how impossible three-dimensional scenes may be modeled and rendered synthetically.