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(nasm.info)Section B.4.266

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B.4.266. `PXOR': MMX Bitwise XOR
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     PXOR mm1,mm2/m64              ; 0F EF /r             [PENT,MMX]
     PXOR xmm1,xmm2/m128           ; 66 0F EF /r     [WILLAMETTE,SSE2]

   `PXOR' performs a bitwise XOR operation between its two operands
(i.e.  each bit of the result is 1 if and only if exactly one of the
corresponding bits of the two inputs was 1), and stores the result in
the destination (first) operand.