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Kim Walisch provides a header-only [[C]]/[[Cpp|C++]] library for [[Population Count|counting the number of 1 bits]] using specialized instructions of various processor architectures <ref>[https://github.com/kimwalisch/libpopcnt GitHub - kimwalisch/libpopcnt: Fast C/C++ bit population count library]</ref>, performing algorithms as described by [[Wojciech Muła]] et al. <ref>[[Wojciech Muła]], [httphttps://dblp.uni-trier.de/pers/hd/k/Kurz:Nathan Nathan Kurz], [https://github.com/lemire Daniel Lemire] ('''2016'''). ''Faster Population Counts Using AVX2 Instructions''. [https://arxiv.org/abs/1611.07612 arXiv:1611.07612]</ref>.