Function _mm_permutex2var_ps 

pub fn _mm_permutex2var_ps(a: __m128, idx: __m128i, b: __m128) -> __m128

Available on x86-64 and target feature avx512f and target feature avx512vl only.

Shuffle single-precision (32-bit) floating-point elements in a and b across lanes using the corresponding selector and index in idx, and store the results in dst.

Intel’s documentation