# [−][src]Function core::arch::x86::_mm_mask_getexp_round_sd

    pub unsafe fn _mm_mask_getexp_round_sd(
        src: __m128d,
        k: __mmask8,
        a: __m128d,
        b: __m128d,
        sae: i32
    ) -> __m128d

🔬 This is a nightly-only experimental API. (`stdsimd` #48556)
This is supported on x86 and target feature `avx512f` only.

Convert the exponent of the lower double-precision (64-bit) floating-point element in b to a double-precision (64-bit) floating-point number representing the integer exponent, 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. This intrinsic essentially calculates floor(log2(x)) for the lower element.
Exceptions can be suppressed by passing _MM_FROUND_NO_EXC in the sae parameter.

Intel's documentation