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(nasm.info)Section B.4.201

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B.4.201. `PADDUSB', `PADDUSW': Add Packed Unsigned Integers With Saturation
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     PADDUSB mm1,mm2/m64           ; 0F DC /r             [PENT,MMX]
     PADDUSW mm1,mm2/m64           ; 0F DD /r             [PENT,MMX]

     PADDUSB xmm1,xmm2/m128         ; 66 0F DC /r    [WILLAMETTE,SSE2]
     PADDUSW xmm1,xmm2/m128         ; 66 0F DD /r    [WILLAMETTE,SSE2]

   `PADDUSx' performs packed addition of the two operands, storing the
result in the destination (first) operand. `PADDUSB' treats the
operands as packed bytes, and adds each byte individually; and
`PADDUSW' treats the operands as packed words.

   When an individual result is too large to fit in its destination, a
saturated value is stored. The resulting value is the maximum value that
will fit in the available space.