Function core::arch::x86_64::_mm512_mask_insertf64x4

pub unsafe fn _mm512_mask_insertf64x4(
    src: __m512d, 
    k: __mmask8, 
    a: __m512d, 
    b: __m256d, 
    const IMM8: i32
) -> __m512d

🔬 This is a nightly-only experimental API. (stdsimd #48556)

This is supported on x86-64 and target feature avx512f only.

Copy a to tmp, then insert 256 bits (composed of 4 packed double-precision (64-bit) floating-point elements) from b into tmp at the location specified by imm8. Store tmp to dst using writemask k (elements are copied from src when the corresponding mask bit is not set).

Intel’s documentation