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(nasm.info)Section B.4.16

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B.4.16. `BSWAP': Byte Swap
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     BSWAP reg32                   ; o32 0F C8+r          [486]

   `BSWAP' swaps the order of the four bytes of a 32-bit register: bits
0-7 exchange places with bits 24-31, and bits 8-15 swap with bits 16-23.
There is no explicit 16-bit equivalent: to byte-swap `AX', `BX', `CX'
or `DX', `XCHG' can be used. When `BSWAP' is used with a 16-bit
register, the result is undefined.