Function _mm_permutexvar_ph 

pub fn _mm_permutexvar_ph(idx: __m128i, a: __m128h) -> __m128h

Available on x86 and target feature avx512fp16 and target feature avx512vl only.

Shuffle half-precision (16-bit) floating-point elements in a using the corresponding index in idx, and store the results in dst.

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