Function `_mm_reduce_pd`

#[target_feature(enable = "avx512dq", enable = "avx512vl")]
pub fn _mm_reduce_pd(a: __m128d, IMM8: i32) -> __m128d

Extract the reduced argument of packed double-precision (64-bit) floating-point elements in a by the number of bits specified by imm8, and store the results in dst. Rounding is done according to the imm8 parameter, which can be one of:

_MM_FROUND_TO_NEAREST_INT : round to nearest
_MM_FROUND_TO_NEG_INF : round down
_MM_FROUND_TO_POS_INF : round up
_MM_FROUND_TO_ZERO : truncate
_MM_FROUND_CUR_DIRECTION : use MXCSR.RC - see _MM_SET_ROUNDING_MODE

Intel's Documentation