Function _mm256_insert_epi16

pub unsafe fn _mm256_insert_epi16(
    a: __m256i,
    i: i16,
    const INDEX: i32,
) -> __m256i

Available on (x86 or x86-64) and target feature avx and x86-64 only.

Copies a to result, and inserts the 16-bit integer i into result at the location specified by index.

Intel’s documentation