Function _mm256_permute2f128_pd

pub unsafe fn _mm256_permute2f128_pd(
    a: __m256d,
    b: __m256d,
    const IMM8: i32,
) -> __m256d

Available on (x86 or x86-64) and target feature avx and x86-64 only.

Shuffles 256 bits (composed of 4 packed double-precision (64-bit) floating-point elements) selected by imm8 from a and b.

Intel’s documentation