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(nasm.info)Section B.4.260

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B.4.260. `PSUBSIW': MMX Packed Subtract with Saturation to Implied Destination
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     PSUBSIW mm1,mm2/m64           ; 0F 55 /r             [CYRIX,MMX]

   `PSUBSIW', specific to the Cyrix extensions to the MMX instruction
set, performs the same function as `PSUBSW', except that the result is
not placed in the register specified by the first operand, but instead
in the implied destination register, specified as for `PADDSIW' (*Note
Section B.4.200::).