Function `_mm512_mask_getexp_round_pd`

#[target_feature(enable = "avx512f")]
pub fn _mm512_mask_getexp_round_pd(src: __m512d, k: __mmask8, a: __m512d, SAE: i32) -> __m512d

Convert the exponent of each packed double-precision (64-bit) floating-point element in a to a double-precision (64-bit) floating-point number representing the integer exponent, and store the results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set). This intrinsic essentially calculates floor(log2(x)) for each element.
Exceptions can be suppressed by passing _MM_FROUND_NO_EXC in the sae parameter.

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