Function _mm_testn_epi16_mask

#[target_feature(enable = "avx512bw", enable = "avx512vl")]
pub const fn _mm_testn_epi16_mask(a: __m128i, b: __m128i) -> __mmask8

Compute the bitwise NAND of packed 16-bit integers in a and b, producing intermediate 16-bit values, and set the corresponding bit in result mask k if the intermediate value is zero.

Intel's documentation