Find least significant bit in the binary representation of unsigned integer

ffs, bsr:

1) https://stackoverflow.com/questions/671815/what-is-the-fastest-most-efficient-way-to-find-the-highest-set-bit-msb-in-an-i

2) https://linux.die.net/man/3/ffs

3) https://c9x.me/x86/html/file_module_x86_id_20.html

Debruijn:
1) https://stackoverflow.com/questions/757059/position-of-least-significant-bit-that-is-set
2) http://graphics.stanford.edu/~seander/bithacks.html
3) https://www.chessprogramming.org/BitScan
4) http://supertech.csail.mit.edu/papers/debruijn.pdf

5) http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogDeBruijn

binary search:
1) https://en.wikipedia.org/wiki/Binary_search_algorithm
2) Двоичный поиск