Analysing value substitution and confidence estimation for value prediction
Value Prediction is one of the newest techniques used to break down ILP limits. Despite being under continuous study during the last few years, a few aspects related to this emerging technique remain unanalysed in depth. Exhaustively investigated in the context of control speculation, confidence est...
| Authors: | , , |
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| Format: | article |
| Publication Date: | 2001 |
| Country: | España |
| Institution: | Universidad Complutense de Madrid (UCM) |
| Repository: | Docta Complutense |
| Language: | English |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/59543 |
| Online Access: | https://hdl.handle.net/20.500.14352/59543 |
| Access Level: | Open access |
| Keyword: | 004 Value prediction Control speculation Confidence estimation. Informática (Informática) Programación de ordenadores (Informática) 1203.17 Informática 1203.23 Lenguajes de Programación |
| Summary: | Value Prediction is one of the newest techniques used to break down ILP limits. Despite being under continuous study during the last few years, a few aspects related to this emerging technique remain unanalysed in depth. Exhaustively investigated in the context of control speculation, confidence estimation has usually played a secondary role on value prediction and speculation. Closely linked to confidence estimation, value substitution also represents a relegated subject of research. This paper is focussed on analysing, in an isolated way, the respective impact on predictor performance of both confidence estimation and value substitution mechanisms. By using detailed pipeline-level simulations, we prove that improvements in these mechanisms are as important as reducing the predictor aliasing or even improving the prediction model. |
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