# Function core::arch::x86_64::_mm256_maskz_lzcnt_epi64

source ·

    pub unsafe fn _mm256_maskz_lzcnt_epi64(k: __mmask8, a: __m256i) -> __m256i

🔬This is a nightly-only experimental API. (`stdsimd` #48556)
Available on (x86 or x86-64) and target feature `avx512cd,avx512vl` only.
Expand description

Counts the number of leading zero bits in each packed 64-bit integer in a, and store the results in dst using zeromask k (elements are zeroed out when the corresponding mask bit is not set).

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