# Function core::arch::x86_64::_mm512_testn_epi64_mask

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    pub unsafe fn _mm512_testn_epi64_mask(a: __m512i, b: __m512i) -> __mmask8

🔬This is a nightly-only experimental API. (`stdsimd` #48556)
Available on (x86 or x86-64) and target feature `avx512f` only.
Expand description

Compute the bitwise NAND of packed 64-bit integers in a and b, producing intermediate 64-bit values, and set the corresponding bit in result mask k if the intermediate value is zero.

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