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(nasm.info)Section B.4.197

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B.4.197. `PADDB', `PADDW', `PADDD': Add Packed Integers
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     PADDB mm1,mm2/m64             ; 0F FC /r             [PENT,MMX]
     PADDW mm1,mm2/m64             ; 0F FD /r             [PENT,MMX]
     PADDD mm1,mm2/m64             ; 0F FE /r             [PENT,MMX]

     PADDB xmm1,xmm2/m128          ; 66 0F FC /r     [WILLAMETTE,SSE2]
     PADDW xmm1,xmm2/m128          ; 66 0F FD /r     [WILLAMETTE,SSE2]
     PADDD xmm1,xmm2/m128          ; 66 0F FE /r     [WILLAMETTE,SSE2]

   `PADDx' performs packed addition of the two operands, storing the
result in the destination (first) operand.

   * `PADDB' treats the operands as packed bytes, and adds each byte
     individually;

   * `PADDW' treats the operands as packed words;

   * `PADDD' treats its operands as packed doublewords.

   When an individual result is too large to fit in its destination, it
is wrapped around and the low bits are stored, with the carry bit
discarded.