Function svrsubhnt_u16 

pub fn svrsubhnt_u16(
    even: svuint8_t,
    op1: svuint16_t,
    op2: svuint16_t,
) -> svuint8_t

🔬This is a nightly-only experimental API. (stdarch_aarch64_sve #145052)

Available on (AArch64 or ARM64EC) and target feature sve and target feature sve2 only.

Rounding subtract narrow high part (top) Arm’s documentation