C library to compute the Hamming weight of arrays. The Hamming weight is the number of ones in a stream of bits. Computing this count quickly has important applications in indexing, machine learning and so forth.

make
./unit
./basic_benchmark

If a CPU doesn't support AVX2 define SSE. If a CPU doesn't support popcnt instruction then define NOPOPCNT.

export SSE=1 NOPOPCNT=1; make
./basic_benchmark