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| year = 1990| s2cid = 122373780
}}.</ref> Because bit-reversal permutations may be repeated multiple times as part of a calculation, it may be helpful to separate
Another consideration that is even more important for the performance of these algorithms is the effect of the [[memory hierarchy]] on running time. Because of this effect, more sophisticated algorithms that consider the block structure of memory can be faster than this naive scan.<ref name="karp"/><ref name="cg98">{{citation|last1=Carter|first1=Larry|first2=Kang Su|last2=Gatlin|contribution=Towards an optimal bit-reversal permutation program|title=Proceedings of the 39th Annual Symposium on Foundations of Computer Science (FOCS)|pages=544–553|year=1998|doi=10.1109/SFCS.1998.743505|title-link=Symposium on Foundations of Computer Science|isbn=978-0-8186-9172-0|citeseerx=10.1.1.46.9319|s2cid=14307262 }}.</ref> An alternative to these techniques is special computer hardware that allows memory to be accessed both in normal and in bit-reversed order.<ref>{{citation
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