MMX instruction for logical exclusive or.

Unlike most MMX instructions, PAND doesn't operate on packed data. Instead, it operates on bits. A MMX register or 64 bit memory location is combined with a MMX register using logical exclusive or. PXORing a register with itself sets it to zero. PXORing a register with a register filled with all 1s flips all its bits.

Compare POR, PANDN, PXOR

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