pub unsafe fn _mm_mask2_permutex2var_pd(
    a: __m128d,
    idx: __m128i,
    k: u8,
    b: __m128d
) -> __m128d
🔬 This is a nightly-only experimental API. (stdsimd)
This is supported on x86-64 and target feature avx512f,avx512vl only.
Expand description

Shuffle double-precision (64-bit) floating-point elements in a and b across lanes using the corresponding selector and index in idx, and store the results in dst using writemask k (elements are copied from idx when the corresponding mask bit is not set)

Intel’s documentation