pub unsafe fn _mm_popcnt_epi64(a: __m128i) -> __m128i
🔬 This is a nightly-only experimental API. (stdsimd #48556)
Available on x86 and target feature avx512vpopcntdq,avx512vl only.
Expand description

For each packed 64-bit integer maps the value to the number of logical 1 bits.

Intel’s documentation