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- W2126331314 abstract "Conventional load/store queues (LSQs) are an impediment to both power-efficient execution in superscalar processors and scaling tolarge-window designs. In this paper, we propose techniques to improve the area and power efficiency of LSQs by allocating entries when instructions issue (late binding), rather than when they are dispatched. This approach enables lower occupancy and thus smaller LSQs. Efficient implementations of late-binding LSQs, however, require the entries in the LSQ to be unordered with respect to age. In this paper, we show how to provide full LSQ functionality in an unordered design with only small additional complexity and negligible performance losses. We show that late-binding, unordered LSQs work well for small-window superscalar processors, but can also be scaled effectively to large, kilo-window processors by breaking the LSQs into address-interleaved banks. To handle the increased overflows, we apply classic network flow control techniques to the processor micronetworks, enabling low-overhead recovery mechanisms from bank overflows. We evaluate three such mechanisms: instruction replay, skid buffers, an dvirtual-channel buffering in the on-chip memory network. We show that for an 80-instruction window, the LSQ can be reduced to 32 entries. For a 1024-instruction window, the unordered, late-binding LSQ works well with four banks of 48 entries each. By applying a Bloom filter as well, this design achieves full hardware memory disambiguation for a 1,024 instruction window while requiring low average power per load and store access of 8 and 12 CAM entries, respectively." @default.
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- W2126331314 date "2007-06-09" @default.
- W2126331314 modified "2023-10-18" @default.
- W2126331314 title "Late-binding" @default.
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- W2126331314 doi "https://doi.org/10.1145/1250662.1250705" @default.
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