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(nasm.info)Section B.4.250

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B.4.250. `PSADBW': Packed Sum of Absolute Differences
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     PSADBW mm1,mm2/m64            ; 0F F6 /r        [KATMAI,MMX]
     PSADBW xmm1,xmm2/m128         ; 66 0F F6 /r     [WILLAMETTE,SSE2]

   `PSADBW' The PSADBW instruction computes the absolute value of the
difference of the packed unsigned bytes in the two source operands.
These differences are then summed to produce a word result in the lower
16-bit field of the destination register; the rest of the register is
cleared. The destination operand is an `MMX' or an `XMM' register. The
source operand can either be a register or a memory operand.