pub unsafe fn _mm512_mask_reduce_add_epi64(k: __mmask8, a: __m512i) -> i64
🔬This is a nightly-only experimental API. (stdsimd #48556)
Available on (x86 or x86-64) and target feature avx512f and x86-64 only.
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使用掩码 k 通过加法来减少 a 中包装的 64 位整数。返回所有活动元素的总和 a.

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