Using vectorized popcount #27
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This PR adds a vectorized population count implementation, described in the paper https://arxiv.org/pdf/1611.07612.pdf by W. Mula, N. Kurz and D. Lemire. The code itself is borrowed from https://github.com/viant/vec/tree/main/bits with few alteration and a toolchain, I have it working for
amd64but haven't implemented forarm64yet.This results in a 50% improvement of performance for
Count()operation and is especially useful for large bitmaps.