Function vreinterpretq_u8_p16 

pub fn vreinterpretq_u8_p16(a: poly16x8_t) -> uint8x16_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.

Vector reinterpret cast operation Arm’s documentation