pub unsafe fn _mm256_mask_blend_pd(
    k: __mmask8,
    a: __m256d,
    b: __m256d
) -> __m256d
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on (x86 or x86-64) and target feature avx512f,avx512vl only.
Expand description

Blend packed double-precision (64-bit) floating-point elements from a and b using control mask k, and store the results in dst.

Intel’s documentation