# Function core::arch::x86_64::_mm256_testn_epi64_mask

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    pub unsafe fn _mm256_testn_epi64_mask(a: __m256i, b: __m256i) -> __mmask8

🔬This is a nightly-only experimental API. (`stdarch_x86_avx512` #111137)
Available on (x86 or x86-64) and target feature `avx512f,avx512vl` and x86-64 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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