Function _mm_mask_scalef_sd
#[target_feature(enable = "avx512f")]
pub fn _mm_mask_scalef_sd(src: __m128d, k: __mmask8, a: __m128d, b: __m128d) -> __m128dScale the packed double-precision (64-bit) floating-point elements in a using values from b, store the result in the lower element of dst using writemask k (the element is copied from src when mask bit 0 is not set), and copy the upper element from a to the upper element of dst.