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Power consumption and power density for the Translation Lookaside Buffer (TLB) are important considerations not only in its design, but can have a consequence on cache design as well. This paper embarks on a new philosophy for reducing the number of accesses to the instruction TLB (iTLB) for power and performance optimizations. The overall idea is to keep a translation currently being used in a register and avoid going to the iTLB as far as possible --- until there is a page change. We propose four different approaches for achieving this, and experimentally demonstrate that one of these schemes that uses a combination of compiler and hardware enhancements can reduce iTLB dynamic power by over 85% in most cases.These mechanisms can work with different instructioncache (iL1) lookup mechanisms and achieve significant iTLB power savings without compromising on performance. Their importance grows with higher iL1 miss rates and larger page sizes. They can work very well with large iTLB structures, that can possibly consume more power and take longer to lookup, without the iTLB getting into the common case. Further, we also experimentally demonstrate that they can provide performance savings for virtually-indexed, virtually-tagged iL1 caches, and can even make physically indexed, physically-tagged iL1 caches a possible choice for implementation.

Generating physical addresses directly for saving instruction TLB energy