pub unsafe fn _mm256_mask_expand_ps(
    src: __m256,
    k: __mmask8,
    a: __m256
) -> __m256
🔬 This is a nightly-only experimental API. (stdsimd #48556)
Available on x86 and target feature avx512f,avx512vl only.
Expand description

Load contiguous active single-precision (32-bit) floating-point elements from a (those with their respective bit set in mask k), and store the results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).

Intel’s documentation