Function core::arch::x86::_mm512_insertf64x4

pub unsafe fn _mm512_insertf64x4<const IMM8: i32>(
    a: __m512d, 
    b: __m256d
) -> __m512d

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

This is supported on x86 and target feature avx512f only.

Copy a to dst, then insert 256 bits (composed of 4 packed double-precision (64-bit) floating-point elements) from b into dst at the location specified by imm8.

Intel’s documentation