# Function _mm_mask_cvtepi8_epi64

Source

    pub fn _mm_mask_cvtepi8_epi64(src: __m128i, k: __mmask8, a: __m128i) -> __m128i

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

Sign extend packed 8-bit integers in the low 2 bytes of a to packed 64-bit integers, 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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