pub unsafe fn _mm_shldi_epi64(
    a: __m128i,
    b: __m128i,
    const IMM8: i32
) -> __m128i
🔬 This is a nightly-only experimental API. (stdsimd #48556)
Available on x86 and target feature avx512vbmi2,avx512vl only.
Expand description

Concatenate packed 64-bit integers in a and b producing an intermediate 128-bit result. Shift the result left by imm8 bits, and store the upper 64-bits in dst).

Intel’s documentation