Function svset2_u64 

pub fn svset2_u64<const IMM_INDEX: i32>(
    tuple: svuint64x2_t,
    x: svuint64_t,
) -> svuint64x2_t

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

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

Change one vector in a tuple of two vectors Arm’s documentation