pub unsafe fn _mm512_mask_shldi_epi32(
    src: __m512i,
    k: __mmask16,
    a: __m512i,
    b: __m512i,
    const IMM8: i32
) -> __m512i
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on (x86 or x86-64) and target feature avx512vbmi2 and x86 only.
Expand description

Concatenate packed 32-bit integers in a and b producing an intermediate 64-bit result. Shift the result left by imm8 bits, and store the upper 32-bits in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).

Intel’s documentation