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(nasm.info)Section B.4.261

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B.4.261. `PSWAPD': Swap Packed Data
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     PSWAPD mm1,mm2/m64            ; 0F 0F /r BB     [PENT,3DNOW]

   `PSWAPD' swaps the packed doublewords in the source operand, and
stores the result in the destination operand.

   In the `K6-2' and `K6-III' processors, this opcode uses the mnemonic
`PSWAPW', and it swaps the order of words when copying from the source
to the destination.

   The operation in the `K6-2' and `K6-III' processors is

        dst[0-15]  = src[48-63];
        dst[16-31] = src[32-47];
        dst[32-47] = src[16-31];
        dst[48-63] = src[0-15].

   The operation in the `K6-x+', `ATHLON' and later processors is:

        dst[0-31]  = src[32-63];
        dst[32-63] = src[0-31].