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Frank DuAntoine Pitrou
e2fbac51a80
Frank Du authored and Antoine Pitrou committed 69239b41d3a
ARROW-9904: [C++] Unroll the loop of CountSetBits.

1. Unroll the loop of CountSetBits to generate parallel instructions.
2. Add count benchmark

Signed-off-by: Frank Du <frank.du@intel.com>

Closes #8103 from jianxind/count_unrolled

Authored-by: Frank Du <frank.du@intel.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>