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(nasm.info)Section B.4.199

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B.4.199. `PADDSB', `PADDSW': Add Packed Signed Integers With Saturation
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     PADDSB mm1,mm2/m64            ; 0F EC /r             [PENT,MMX]
     PADDSW mm1,mm2/m64            ; 0F ED /r             [PENT,MMX]

     PADDSB xmm1,xmm2/m128         ; 66 0F EC /r     [WILLAMETTE,SSE2]
     PADDSW xmm1,xmm2/m128         ; 66 0F ED /r     [WILLAMETTE,SSE2]

   `PADDSx' performs packed addition of the two operands, storing the
result in the destination (first) operand. `PADDSB' treats the operands
as packed bytes, and adds each byte individually; and `PADDSW' 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 value with the
largest magnitude of the same sign as the result which will fit in the
available space.