Function svqrshrnt_n_s64 

pub fn svqrshrnt_n_s64<const IMM2: i32>(
    even: svint32_t,
    op1: svint64_t,
) -> svint32_t

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

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

Saturating rounding shift right narrow (top) Arm’s documentation