pub unsafe fn _mm512_mask_fmadd_pd(
    a: __m512d,
    k: __mmask8,
    b: __m512d,
    c: __m512d
) -> __m512d
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on (x86 or x86-64) and target feature avx512f and x86-64 only.
Expand description

Multiply packed double-precision (64-bit) floating-point elements in a and b, add the intermediate result to packed elements in c, and store the results in dst using writemask k (elements are copied from a when the corresponding mask bit is not set).

Intel’s documentation