pub fn _mm256_mask_add_pd(
    src: __m256d,
    k: __mmask8,
    a: __m256d,
    b: __m256d,
) -> __m256dAvailable on x86 and target feature 
avx512f and target feature avx512vl only.Expand description
Add packed double-precision (64-bit) floating-point elements in a and b, and store the results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).