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Energy-efficient issue queue design

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5 Author(s)
Ponomarev, D.V. ; Dept. of Comput. Sci., State Univ. of New York, Binghamton, NY, USA ; Kucuk, G. ; Ergin, O. ; Ghose, K.
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The out-of-order issue queue (IQ), used in modern superscalar processors is a considerable source of energy dissipation. We consider design alternatives that result in significant reductions in the power dissipation of the IQ (by as much as 75%) through the use of comparators that dissipate energy mainly on a tag match, 0-B encoding of operands to imply the presence of bytes with all zeros and, bitline segmentation. Our results are validated by the execution of SPEC 95 benchmarks on a true hardware level, cycle-by-cycle simulator for a superscalar processor and SPICE measurements for actual layouts of the IQ in a 0.18-/spl mu/m CMOS process.

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Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:11 ,  Issue: 5 )