Function _mm512_fmadd_pd 

pub fn _mm512_fmadd_pd(a: __m512d, b: __m512d, c: __m512d) -> __m512d

Available on x86 and target feature avx512f only.

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.

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