# Function core::arch::x86_64::_mm512_mask_shldi_epi64

source ·

    pub unsafe fn _mm512_mask_shldi_epi64(
        src: __m512i,
        k: __mmask8,
        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 x86-64 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 using writemask k (elements are copied from src when the corresponding mask bit is not set).

Intel’s documentation