Function _mm_maskz_roundscale_sd

#[target_feature(enable = "avx512f")]
pub fn _mm_maskz_roundscale_sd(k: __mmask8, a: __m128d, b: __m128d, IMM8: i32) -> __m128d

Round the lower double-precision (64-bit) floating-point element in b to the number of fraction bits specified by imm8, store the result in the lower element of dst using zeromask k (the element is zeroed out when mask bit 0 is not set), and copy the upper element from a to the upper element of dst.
Rounding is done according to the imm8[2:0] parameter, which can be one of:\

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