Function _mm512_fmsubadd_pd

#[target_feature(enable = "avx512f")]
pub const fn _mm512_fmsubadd_pd(a: __m512d, b: __m512d, c: __m512d) -> __m512d

Multiply packed double-precision (64-bit) floating-point elements in a and b, alternatively subtract and add packed elements in c from/to the intermediate result, and store the results in dst.

Intel's documentation