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Apparatus for performing multiply-add operations on packed data

Image Number 16 for United States Patent #6035316.

A processor having a first and second storage having a first and second packed data, respectively. Each packed data includes a first, second, third, and fourth data element. A multiply-add circuit is coupled to the first and second storage areas. The multiply-add circuit includes a first, second, third, and fourth multiplier, wherein each of the multipliers receives a corresponding set of said data elements. The multiply-add circuit further includes a first adder coupled to the first and second multipliers, and second adder coupled to the third and fourth multipliers. A third storage area is coupled to the adders. The third storage area includes a first and second field for saving output of the first and second adders, respectively, as first and second data elements of a third packed data.

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