Function _mm256_permutexvar_pd 

pub fn _mm256_permutexvar_pd(idx: __m256i, a: __m256d) -> __m256d

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

Shuffle double-precision (64-bit) floating-point elements in a across lanes using the corresponding index in idx, and store the results in dst.

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