# Function _mm256_mask_lzcnt_epi64

1.89.0 · Source

    pub fn _mm256_mask_lzcnt_epi64(src: __m256i, k: __mmask8, a: __m256i) -> __m256i

Available on (x86 or x86-64) and target feature `avx512cd,avx512vl` and x86 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 writemask k (elements are copied from src when the corresponding mask bit is not set).

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