Function svqdech_pat_s16 

pub fn svqdech_pat_s16<const PATTERN: svpattern, const IMM_FACTOR: i32>(
    op: svint16_t,
) -> svint16_t

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

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

Saturating decrement by number of halfword elements Arm’s documentation