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(nasm.info)Section B.4.202

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B.4.202. `PAND', `PANDN': MMX Bitwise AND and AND-NOT
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     PAND mm1,mm2/m64              ; 0F DB /r             [PENT,MMX]
     PANDN mm1,mm2/m64             ; 0F DF /r             [PENT,MMX]

     PAND xmm1,xmm2/m128           ; 66 0F DB /r     [WILLAMETTE,SSE2]
     PANDN xmm1,xmm2/m128          ; 66 0F DF /r     [WILLAMETTE,SSE2]

   `PAND' performs a bitwise AND operation between its two operands
(i.e.  each bit of the result is 1 if and only if the corresponding
bits of the two inputs were both 1), and stores the result in the
destination (first) operand.

   `PANDN' performs the same operation, but performs a one's complement
operation on the destination (first) operand first.