pub unsafe fn _mm256_mask_popcnt_epi8(
    src: __m256i,
    k: u32,
    a: __m256i
) -> __m256i
🔬This is a nightly-only experimental API. (stdsimd)
Available on x86-64 only.
Expand description

For each packed 8-bit integer maps the value to the number of logical 1 bits.

Uses the writemask in k - elements are copied from src if the corresponding mask bit is not set. Otherwise the computation result is written into the result.

Intel’s documentation