Function _mm256_fmsubadd_pd
#[target_feature(enable = "fma")]
pub const fn _mm256_fmsubadd_pd(a: __m256d, b: __m256d, c: __m256d) -> __m256dMultiplies packed double-precision (64-bit) floating-point elements in a
and b, and alternatively subtract and add packed elements in c from/to
the intermediate result.