Editing Branch predictor (section)

===Agree predictor===
An agree predictor is a two-level adaptive predictor with globally shared history buffer and pattern history table, and an additional local saturating counter. The outputs of the local and the global predictors are XORed with each other to give the final prediction. The purpose is to reduce contentions in the pattern history table where two branches with opposite prediction happen to share the same entry in the pattern history table.<ref>{{cite conference |author-first1=E. |author-last1=Sprangle  |author-first2=R.S. |author-last2=Chappell |author3-first=M. |author3-last=Alsup |author4-first=Y.N. |author4-last=Patt |author4-link=Yale Patt |title=The Agree Predictor: A Mechanism for Reducing Negative Branch History Interference |url=http://meseec.ce.rit.edu/eecc722-fall2006/papers/branch-prediction/5/agree_isca24.pdf |book-title=Proceedings of the 24th International Symposium on Computer Architecture |date=June 1997 |location=Denver |doi=10.1145/264107.264210}}</ref>