pub unsafe fn _mm_mask_cmp_round_sd_mask(
    k1: __mmask8,
    a: __m128d,
    b: __m128d,
    const IMM5: i32,
    const SAE: i32
) -> __mmask8
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on (x86 or x86-64) and target feature avx512f and x86-64 only.
Expand description

Compare the lower double-precision (64-bit) floating-point element in a and b based on the comparison operand specified by imm8, and store the result in mask vector k using zeromask k1 (the element is zeroed out when mask bit 0 is not set).
Exceptions can be suppressed by passing _MM_FROUND_NO_EXC in the sae parameter.

Intel’s documentation