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Energy-effective issue logic
The issue logic of a dynamically-scheduled superscalar processor is a complex mechanism devoted to start the execution of multiple instructions every cycle. Due to its complexity, it is responsible for a significant percentage of the energy consumed by a microprocessor. The energy consumption of the issue logic depends on several architectural parameters, the instruction issue queue size being one of the most important. In this paper we present a technique to reduce the energy consumption of the issue logic of a high-performance superscalar processor. The proposed technique is based on the observation that the conventional issue logic wastes a significant amount of energy for useless activity. In particular, the wake-up of empty entries and operands that are ready represents an important source of energy waste. Besides, we propose a mechanism to dynamically reduce the effective size of the instruction queue. We show that on average the effective instruction queue size can be reduced by a factor of 26% with minimal impact on performance. This reduction together with the energy saved for empty and ready entries result in about 90.7% reduction in the energy consumed by the wake-up logic, which represents 14.9% of the total energy of the assumed processor.
Issue logic, Microprocessors -- Energy consumption, Energy consumption, Àrees temàtiques de la UPC::Informàtica::Arquitectura de computadors, Microprocessadors -- Consum d'energia, Adaptive hardware, Low power, :Informàtica::Arquitectura de computadors [Àrees temàtiques de la UPC]
Issue logic, Microprocessors -- Energy consumption, Energy consumption, Àrees temàtiques de la UPC::Informàtica::Arquitectura de computadors, Microprocessadors -- Consum d'energia, Adaptive hardware, Low power, :Informàtica::Arquitectura de computadors [Àrees temàtiques de la UPC]
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).218 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 10% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Top 1% impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 1% visibility views 41 download downloads 164 - 41views164downloads
Data source Views Downloads UPCommons. Portal del coneixement obert de la UPC 41 164


