Function vabal_s8 

pub fn vabal_s8(a: int16x8_t, b: int8x8_t, c: int8x8_t) -> int16x8_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.

Signed Absolute difference and Accumulate Long Arm’s documentation