pub fn _mm256_shuffle_i64x2(a: __m256i, b: __m256i, const MASK: i32) -> __m256iAvailable on x86-64 and target feature 
avx512f and target feature avx512vl only.Expand description
Shuffle 128-bits (composed of 2 64-bit integers) selected by imm8 from a and b, and store the results in dst.