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BSWAP           Byte Swap                            Flags: Not altered

BSWAP destination                                    CPU: 486+

    BSWAP reverses the byte order of a 32-bit register, converting a
    value in little endian format to big endian format, or vice versa.

    If BSWAP is used with a 16-bit operand size, the result in the
    destination register is undefined.

        Example:        mov     eax,87654321h
                        bswap   eax
                        ; eax = 21436587h


    Opcode      Format
    0F C8 /r    BSWAP r32


    Length and timing
    Operands    Bytes   8088    186     286     386     486     Pentium
      r32        2                                       1       1   NP