Function _mm256_mask_fmsubadd_ph
#[target_feature(enable = "avx512fp16", enable = "avx512vl")]
pub const fn _mm256_mask_fmsubadd_ph(a: __m256h, k: __mmask16, b: __m256h, c: __m256h) -> __m256hMultiply packed half-precision (16-bit) floating-point elements in a and b, alternatively subtract and add packed elements in c to/from the intermediate result, and store the results in dst using writemask k (the element is copied from a when the corresponding mask bit is not set).