Function core::arch::x86_64::_mm256_extractf128_pd

pub unsafe fn _mm256_extractf128_pd(a: __m256d, imm8: i32) -> __m128d

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

Extracts 128 bits (composed of 2 packed double-precision (64-bit) floating-point elements) from a, selected with imm8.

Intel's documentation