| Publisher | Microsoft | ||
|---|---|---|---|
| Format | 685.4KB PDF | Date added | 01 Dec 2006 |
| Topics | Processors | ||
| Downloads | 0 | ||
This paper proposes implementable Wrong-Path Usefulness Predictors (WPUPs) that can accurately predict whether or not wrong-path execution will be beneficial for performance. The WPUP is used in combination with a novel low-cost fetch gating scheme that does not require large specialized prediction structures to estimate if the processor is on the wrong path. If the WPUP predicts that wrong-path execution will be beneficial for performance, the fetch engine is not gated. The results show that this mechanism reduces the performance loss incurred by fetch gating mechanisms that assume wrong-path execution is useless, thereby both improving performance and reducing energy consumption.
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