autovectorization is hit and miss. I recently wrote this which has to count the bits in a result mask of vector operations and it turns into popcnt just fine.

autovectorization is hit and miss. I recently wrote this which has to count the bits in a result mask of vector operations and it turns into popcnt just fine. https://godbolt.org/z/zT9Whcnco https://godbolt.org/z/zT9Whcnco