Function core::arch::x86::_mm256_sllv_epi64

pub unsafe fn _mm256_sllv_epi64(a: __m256i, count: __m256i) -> __m256i

This is supported on x86 and target feature avx2 only.

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

Intel's documentation