Function core_arch::x86_64::_mm256_permute4x64_pd

pub unsafe fn _mm256_permute4x64_pd(a: __m256d, imm8: i32) -> __m256d

This is supported on x86-64 and target feature avx2 only.

Shuffles 64-bit floating-point elements in a across lanes using the control in imm8.

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