Function core::arch::x86::_mm256_blend_pd

pub unsafe fn _mm256_blend_pd<const IMM4: i32>(
    a: __m256d, 
    b: __m256d
) -> __m256d

This is supported on x86 and target feature avx only.

Blends packed double-precision (64-bit) floating-point elements from a and b using control mask imm8.

Intel’s documentation