Function vtrnq_p8 

pub fn vtrnq_p8(a: poly8x16_t, b: poly8x16_t) -> poly8x16x2_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.

Transpose elements Arm’s documentation