A32 NEON 8x8 U16 transpose
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| ; input in Q0..Q7 | |
| ; swap antidiagonal elements within 2x2 blocks | |
| vtrn.16 q0, q1 | |
| vtrn.16 q2, q3 | |
| vtrn.16 q4, q5 | |
| vtrn.16 q6, q7 | |
| ; swap antidiagonal 2x2 blocks within 4x4 blocks | |
| vtrn.32 q0, q2 | |
| vtrn.32 q1, q3 | |
| vtrn.32 q4, q6 | |
| vtrn.32 q5, q7 | |
| ; swap antidiagonal 4x4 blocks within 8x8 matrix | |
| vswp d1, d8 | |
| vswp d3, d10 | |
| vswp d5, d12 | |
| vswp d7, d14 |
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