Function _mm512_sllv_epi64 

pub fn _mm512_sllv_epi64(a: __m512i, count: __m512i) -> __m512i

Available on x86-64 and target feature avx512f only.

Shift packed 64-bit integers in a left by the amount specified by the corresponding element in count while shifting in zeros, and store the results in dst.

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