Frank Du created ARROW-9904:
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Summary: [C++] Unroll the loop manually for CountSetBits
Key: ARROW-9904
URL: https://issues.apache.org/jira/browse/ARROW-9904
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Frank Du
Assignee: Frank Du
The tight loop below can get better performance if unroll manually to indicate
the compiler generating better parallel instructions.
for (auto iter = u64_data; iter < end; ++iter) {
count += BitUtil::PopCount(*iter);
}
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