Function vcopyq_laneq_s64

pub unsafe fn vcopyq_laneq_s64(
    a: int64x2_t,
    const LANE1: i32,
    b: int64x2_t,
    const LANE2: i32,
) -> int64x2_t

Available on (AArch64 or target_arch="arm64ec") and target feature neon only.

Insert vector element from another vector element

Arm’s documentation