Function _mm256_testn_epi32_mask 

pub fn _mm256_testn_epi32_mask(a: __m256i, b: __m256i) -> __mmask8

Available on x86 and target feature avx512f and target feature avx512vl only.

Compute the bitwise NAND of packed 32-bit integers in a and b, producing intermediate 32-bit values, and set the corresponding bit in result mask k if the intermediate value is zero.

Intel’s documentation