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Better Branch Prediction Through Prophet/Critic Hybrids
January/February 2005 (vol. 25 no. 1)
pp. 80-89
Ayose Falc?, Hewlett-Packard Labs
Jared Stark, Intel
Alex Ramirez, Universitat Politecnica de Catalunya
Konrad Lai, Intel
Mateo Valero, Universitat Politecnica de Catalunya
The prophet/critic hybrid conditional branch predictor has two component predictors. The prophet uses a branch's history to predict its direction. We call this prediction and the ones for branches following it the branch future. The critic uses the branch's history and future to critique the prophet's prediction. The hybrid combines the prophet's prediction with the critique, either agree or disagree, forming the branch's overall prediction. Results show these hybrids can reduce mispredicts by 39 percent and improve processor performance by 7.8 percent.
Citation:
Ayose Falc?, Jared Stark, Alex Ramirez, Konrad Lai, Mateo Valero, "Better Branch Prediction Through Prophet/Critic Hybrids," IEEE Micro, vol. 25, no. 1, pp. 80-89, Jan.-Feb. 2005, doi:10.1109/MM.2005.5
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