Function svhsubr_n_u64_x 

pub fn svhsubr_n_u64_x(pg: svbool_t, op1: svuint64_t, op2: u64) -> svuint64_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.

Halving subtract reversed Arm’s documentation