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(nasm.info)Section B.4.259

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B.4.259. `PSUBSxx', `PSUBUSx': Subtract Packed Integers With Saturation
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     PSUBSB mm1,mm2/m64            ; 0F E8 /r             [PENT,MMX]
     PSUBSW mm1,mm2/m64            ; 0F E9 /r             [PENT,MMX]

     PSUBSB xmm1,xmm2/m128         ; 66 0F E8 /r     [WILLAMETTE,SSE2]
     PSUBSW xmm1,xmm2/m128         ; 66 0F E9 /r     [WILLAMETTE,SSE2]

     PSUBUSB mm1,mm2/m64           ; 0F D8 /r             [PENT,MMX]
     PSUBUSW mm1,mm2/m64           ; 0F D9 /r             [PENT,MMX]

     PSUBUSB xmm1,xmm2/m128        ; 66 0F D8 /r     [WILLAMETTE,SSE2]
     PSUBUSW xmm1,xmm2/m128        ; 66 0F D9 /r     [WILLAMETTE,SSE2]

   `PSUBSx' and `PSUBUSx' subtracts packed integers in the source
operand from those in the destination operand, and use saturation for
results that are outside the range supported by the destination operand.

   * `PSUBSB' operates on signed bytes, and uses signed saturation on
     the results.

   * `PSUBSW' operates on signed words, and uses signed saturation on
     the results.

   * `PSUBUSB' operates on unsigned bytes, and uses signed saturation on
     the results.

   * `PSUBUSW' operates on unsigned words, and uses signed saturation on
     the results.