Function vec_cntlz 

pub unsafe fn vec_cntlz<T>(a: T) -> T
where
    T: VectorCntlz,

🔬This is a nightly-only experimental API. (stdarch_powerpc #111145)

Available on PowerPC and target feature altivec only.

Vector Count Leading Zeros

Purpose

Returns a vector containing the number of most-significant bits equal to zero of each corresponding element of the source vector.

Result value

The value of each element of r is set to the number of leading zeros of the corresponding element of a.