pub unsafe fn _mm256_mask_extractf32x4_ps<const IMM8: i32>(
    src: __m128,
    k: u8,
    a: __m256
) -> __m128
🔬 This is a nightly-only experimental API. (stdsimd)
This is supported on x86-64 and target feature avx512f,avx512vl only.
Expand description

Extract 128 bits (composed of 4 packed single-precision (32-bit) floating-point elements) from a, selected with imm8, 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