# Function _mm256_mask_insertf64x2

Source

    pub fn _mm256_mask_insertf64x2(
        src: __m256d,
        k: __mmask8,
        a: __m256d,
        b: __m128d,
        const IMM8: i32,
    ) -> __m256d

🔬This is a nightly-only experimental API. (`stdarch_x86_avx512` #111137)
Available on (x86 or x86-64) and target feature `avx512dq,avx512vl` and x86 only.
Expand description

Copy a to tmp, then insert 128 bits (composed of 2 packed double-precision (64-bit) floating-point elements) from b into tmp at the location specified by IMM8, and copy tmp to dst using writemask k (elements are copied from src if the corresponding bit is not set).

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