A Unified Approach to Eliminate Memory Accesses Early
Paper i proceeding, 2011

This paper introduces the notion of silent loads to classify load accesses that can be satisfied by already available values of the physical register file and proposes a new architectural concept to exploit such loads. The paper then unifies different approaches of eliminating memory accesses early by contributing with a new architectural scheme. We show that our unified approach covers previously proposed techniques of exploiting forwarded and small-value loads in addition to silent loads. Forwarded loads obtain values through load-to-load and store-to-load forwarding whereas small-value loads return small values that can be coded with 8 bits or less. We find that 22%, 31% and 24% of all dynamic loads are forwarded, small-value and silent, respectively. We demonstrate that the prevalence of such loads is mostly inherent in applications. We establish that a hypothetical scheme that encompasses all the categories can eliminate as many as 42% of all dynamic loads and about 18% of all committed stores. Finally, we contribute with a new architectural technique to implement the unified scheme. We show that our proposed scheme reduces execution time to provide noticeable speedup and reduces overall energy dissipation with very low area overhead.

Forwarded load

Silent store

Small-value load

Silent load


Mafijul Islam

Chalmers, Data- och informationsteknik, Datorteknik

Per Stenström

Chalmers, Data- och informationsteknik, Datorteknik

Proceedings of the 14th International Conference on Compilers, Architectures and Synthesis for Embedded Systems, CASES'11, Taipei, 9-14 October 2011

978-145030713-0 (ISBN)




Informations- och kommunikationsteknik


Hållbar utveckling

Innovation och entreprenörskap


Grundläggande vetenskaper





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