Function vext_s64 

pub unsafe fn vext_s64(a: int64x1_t, _b: int64x1_t, const N: i32) -> int64x1_t

Available on (AArch64 or ARM64EC) and (AArch64 or ARM64EC or target feature v7) and (ARM or AArch64 or ARM64EC) and target feature neon only.

Extract vector from pair of vectors Arm’s documentation

Safety

• Neon intrinsic unsafe