Function vraddhn_high_s16 

pub fn vraddhn_high_s16(a: int8x8_t, b: int16x8_t, c: int16x8_t) -> int8x16_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.

Rounding Add returning High Narrow (high half). Arm’s documentation