Function `_mm512_maskz_reduce_ph`

#[target_feature(enable = "avx512fp16")]
pub fn _mm512_maskz_reduce_ph(k: __mmask32, a: __m512h, IMM8: i32) -> __m512h

Extract the reduced argument of packed half-precision (16-bit) floating-point elements in a by the number of bits specified by imm8, and store the results in dst using zeromask k (elements are zeroed out when the corresponding mask bit is not set).

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

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