Invention Application
- Patent Title: POWER EFFICIENT FETCH ADAPTATION
- Patent Title (中): 功率有效的FET适配
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Application No.: US14827262Application Date: 2015-08-14
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Publication No.: US20170046159A1Publication Date: 2017-02-16
- Inventor: Shivam PRIYADARSHI , Rami Mohammad AL SHEIKH , Raguram DAMODARAN
- Applicant: QUALCOMM Incorporated
- Main IPC: G06F9/38
- IPC: G06F9/38 ; G06F12/08

Abstract:
Systems and methods relate to an instruction fetch unit of a processor, such as a superscalar processor. The instruction fetch unit includes a fetch bandwidth predictor (FBWP) configured to predict a number of instructions to be fetched in a fetch group of instructions in a pipeline stage of the processor. A first entry of the FBWP corresponding to the fetch group corresponds to a prediction of the number of instructions to be fetched, based on occurrence and location of a predicted taken branch instruction in the fetch group and a confidence level associated with the predicted number in the prediction field. The instruction fetch unit is configured to fetch only the predicted number of instructions, rather than the maximum number of entries that can be fetched in the pipeline stage, if the confidence level is greater than a predetermined threshold. In this manner, wasteful fetching of instructions is avoided.
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