Function _mm256_shldi_epi16

#[target_feature(enable = "avx512vbmi2", enable = "avx512vl")]
pub const fn _mm256_shldi_epi16(a: __m256i, b: __m256i, IMM8: i32) -> __m256i

Concatenate packed 16-bit integers in a and b producing an intermediate 32-bit result. Shift the result left by imm8 bits, and store the upper 16-bits in dst).

Intel's documentation