Function vpadd_s8 

pub fn vpadd_s8(a: int8x8_t, b: int8x8_t) -> int8x8_t

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

Add pairwise. Arm’s documentation