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Instruction mmx - PMULLW—Packed Multiply Low

Multiplies the four signed or unsigned words of the source operand (second operand) with the four signed or unsigned words of the destination operand (first operand), producing four doubleword, intermediate results. The low-order word of each intermediate result is then written to its corresponding word location in the destination operand. The destination operand must be an MMX technology register; the source operand may be either an MMX technology register or a 64-bit memory location.