Function vcombine_f32 

pub fn vcombine_f32(a: float32x2_t, b: float32x2_t) -> float32x4_t

Available on little-endian and target feature neon and (AArch64 or ARM or ARM64EC) and (AArch64 or ARM64EC) and (AArch64 or ARM64EC or target feature v7) only.

Join two smaller vectors into a single larger vector Arm’s documentation