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    Abbreviations and legends
    imm8        an immediate signed byte value
    r/m32       32-bit register or memory operand
    mm/m32      indicates the lowest 32 bits of an MMX register or a
                32-bit memory location
    mm/m64      a 64-bit MMX register or a 64-bit memory location
    mm(B..A)    bits B thru A (both included) of an MMX register