Function vaddl_u8 

pub fn vaddl_u8(a: uint8x8_t, b: uint8x8_t) -> uint16x8_t

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

Add Long (vector). Arm’s documentation