Function vec_popcnt 

pub unsafe fn vec_popcnt<T: CountBits>(a: T) -> T::Result

🔬This is a nightly-only experimental API. (stdarch_s390x #135681)

Available on s390x and non-target_abi=softfloat and target feature vector only.

Vector Population Count

Computes the population count (number of set bits) in each element of the input.