Function _mm256_insertf32x4

#[target_feature(enable = "avx512f", enable = "avx512vl")]
pub const fn _mm256_insertf32x4(a: __m256, b: __m128, IMM8: i32) -> __m256

Copy a to dst, then insert 128 bits (composed of 4 packed single-precision (32-bit) floating-point elements) from b into dst at the location specified by imm8.

Intel's documentation