RT Journal Article
T1 Improving Circuit Performance with Multispeculative Additive Trees in High-Level Synthesis
A1 Barrio García, Alberto Antonio Del
A1 Hermida Correa, Román
A1 Ogrenci Memik, Seda
A1 Mendías Cuadros, José Manuel
A1 Molina Prego, María del Carmen
AB The recent introduction of Variable Latency Functional Units (VLFUs) has broadened the design space of HighLevel Synthesis (HLS). Nevertheless their use is restricted to only few operators in the datapaths because the number of cases to control grows exponentially. In this work an instance of VLFUs is described, and based on its structure, the average latency of tree structures is improved. Multispeculative Functional Units (MSFUs) are arithmetic Functional Units that operate using several predictors for the carry signal. In spite of utilizing more than a predictor, none or only one additional very short cycle is enough for producing the correct result in the majority of the cases. In this paper our proposal takes advantage of multispeculation in order to increase the performance of tree structures with a negligible area penalty. By judiciously introducing these structures into computation trees, it will only be necessary to predict the carry signals in certain selected nodes, thus minimizing the total number of predictions and the number of operations that can potentially mispredict. Hence, the average latency will be diminished and thus performance will be increased. Our experiments show that it is possible to improve 26% execution time. Furthermore, our flow outperforms previous approaches with Speculative FUs.
PB Elsevier
SN 0026-2692
YR 2014
FD 2014-11
LK https://hdl.handle.net/20.500.14352/34743
UL https://hdl.handle.net/20.500.14352/34743
LA eng
DS Docta Complutense
RD 18 may 2024